18 files changed, 715 insertions, 825 deletions

diff --git a/data/templates/bcast-relay/udp-broadcast-relay.tmpl b/data/templates/bcast-relay/udp-broadcast-relay.tmpl
index 73e9acad4..7b2b9b1a2 100644
--- a/data/templates/bcast-relay/udp-broadcast-relay.tmpl
+++ b/data/templates/bcast-relay/udp-broadcast-relay.tmpl
@@ -1,7 +1,5 @@
 ### Autogenerated by bcast_relay.py ###
 
 # UDP broadcast relay configuration for instance {{ id }}
-{% if description %}
-# Comment: {{ description }}
-{% endif %}
-DAEMON_ARGS="{{ '-s ' + address if address is defined }} {{ instance }} {{ port }} {{ interface | join(' ') }}"
+{{ '# ' ~ description if description is vyos_defined }}
+DAEMON_ARGS="{{ '-s ' ~ address if address is defined }} {{ instance }} {{ port }} {{ interface | join(' ') }}"
diff --git a/data/templates/conntrack/nftables-ct.tmpl b/data/templates/conntrack/nftables-ct.tmpl
index c0fe5297d..cebc1a54e 100644
--- a/data/templates/conntrack/nftables-ct.tmpl
+++ b/data/templates/conntrack/nftables-ct.tmpl
@@ -10,31 +10,27 @@ flush chain raw {{ nft_ct_timeout_name }}
 
 table raw {
     chain {{ nft_ct_ignore_name }} {
-{% if ignore is defined and ignore.rule is defined and ignore.rule is not none %}
+{% if ignore.rule is vyos_defined %}
 {%   for rule, rule_config in ignore.rule.items() %}
         # rule-{{ rule }} {{ '- ' ~ rule_config.description if rule_config.description is defined and rule_config.description is not none }}
 {%     set nft_command = '' %}
-{%     if rule_config.inbound_interface is defined and rule_config.inbound_interface is not none %}
+{%     if rule_config.inbound_interface is vyos_defined %}
 {%       set nft_command = nft_command ~ ' iifname ' ~ rule_config.inbound_interface %}
 {%     endif %}
-{%     if rule_config.protocol is defined and rule_config.protocol is not none %}
+{%     if rule_config.protocol is vyos_defined %}
 {%       set nft_command = nft_command ~ ' ip protocol ' ~ rule_config.protocol %}
 {%     endif %}
-{%     if rule_config.destination is defined and rule_config.destination is not none %}
-{%       if rule_config.destination.address is defined and rule_config.destination.address is not none %}
-{%         set nft_command = nft_command ~ ' ip daddr ' ~ rule_config.destination.address %}
-{%       endif %}
-{%       if rule_config.destination.port is defined and rule_config.destination.port is not none %}
-{%         set nft_command = nft_command ~ ' ' ~ rule_config.protocol ~ ' dport { ' ~ rule_config.destination.port ~ ' }' %}
-{%       endif %}
+{%     if rule_config.destination.address is vyos_defined %}
+{%       set nft_command = nft_command ~ ' ip daddr ' ~ rule_config.destination.address %}
 {%     endif %}
-{%     if rule_config.source is defined and rule_config.source is not none %}
-{%       if rule_config.source.address is defined and rule_config.source.address is not none %}
-{%         set nft_command = nft_command ~ ' ip saddr ' ~ rule_config.source.address %}
-{%       endif %}
-{%       if rule_config.source.port is defined and rule_config.source.port is not none %}
-{%         set nft_command = nft_command ~ ' ' ~ rule_config.protocol ~ ' sport { ' ~ rule_config.source.port ~ ' }' %}
-{%       endif %}
+{%     if rule_config.destination.port is vyos_defined %}
+{%       set nft_command = nft_command ~ ' ' ~ rule_config.protocol ~ ' dport { ' ~ rule_config.destination.port ~ ' }' %}
+{%     endif %}
+{%     if rule_config.source.address is vyos_defined %}
+{%       set nft_command = nft_command ~ ' ip saddr ' ~ rule_config.source.address %}
+{%     endif %}
+{%     if rule_config.source.port is vyos_defined %}
+{%       set nft_command = nft_command ~ ' ' ~ rule_config.protocol ~ ' sport { ' ~ rule_config.source.port ~ ' }' %}
 {%     endif %}
        {{ nft_command }} counter notrack comment ignore-{{ rule }}
 {%   endfor %}
@@ -42,7 +38,7 @@ table raw {
         return
     }
     chain {{ nft_ct_timeout_name }} {
-{% if timeout is defined and timeout.custom is defined and timeout.custom.rule is defined and timeout.custom.rule is not none %}
+{% if timeout.custom.rule is vyos_defined %}
 {%   for rule, rule_config in timeout.custom.rule.items() %}
         # rule-{{ rule }} {{ '- ' ~ rule_config.description if rule_config.description is defined and rule_config.description is not none }}
 {%   endfor %}
diff --git a/data/templates/conntrack/sysctl.conf.tmpl b/data/templates/conntrack/sysctl.conf.tmpl
index 9e97c3286..075402c04 100644
--- a/data/templates/conntrack/sysctl.conf.tmpl
+++ b/data/templates/conntrack/sysctl.conf.tmpl
@@ -6,7 +6,7 @@ net.netfilter.nf_conntrack_max = {{ table_size }}
 
 net.ipv4.tcp_max_syn_backlog = {{ tcp.half_open_connections }}
 
-net.netfilter.nf_conntrack_tcp_loose = {{ '1' if tcp.loose == 'enable' else '0' }}
+net.netfilter.nf_conntrack_tcp_loose = {{ '1' if tcp.loose is vyos_defined('enable') else '0' }}
 net.netfilter.nf_conntrack_tcp_max_retrans = {{ tcp.max_retrans }}
 
 net.netfilter.nf_conntrack_icmp_timeout = {{ timeout.icmp }}
diff --git a/data/templates/frr/bfdd.frr.tmpl b/data/templates/frr/bfdd.frr.tmpl
index 439f79d67..ac55d4634 100644
--- a/data/templates/frr/bfdd.frr.tmpl
+++ b/data/templates/frr/bfdd.frr.tmpl
@@ -1,22 +1,22 @@
-{% if profile is defined or peer is defined %}
+{% if profile is vyos_defined or peer is vyos_defined %}
 bfd
-{% if profile is defined and profile is not none %}
+{% if profile is vyos_defined %}
 {%   for profile_name, profile_config in profile.items() %}
  profile {{ profile_name }}
   detect-multiplier {{ profile_config.interval.multiplier }}
   receive-interval {{ profile_config.interval.receive }}
   transmit-interval {{ profile_config.interval.transmit }}
-{%     if profile_config.interval.echo_interval is defined and profile_config.interval.echo_interval is not none %}
+{%     if profile_config.interval.echo_interval is vyos_defined %}
   echo transmit-interval {{ profile_config.interval.echo_interval }}
   echo receive-interval {{ profile_config.interval.echo_interval }}
 {%     endif %}
-{%     if profile_config.echo_mode is defined %}
+{%     if profile_config.echo_mode is vyos_defined %}
   echo-mode
 {%     endif %}
-{%     if profile_config.passive is defined %}
+{%     if profile_config.passive is vyos_defined %}
   passive-mode
 {%     endif %}
-{%     if profile_config.shutdown is defined %}
+{%     if profile_config.shutdown is vyos_defined %}
   shutdown
 {%     else %}
   no shutdown
@@ -25,26 +25,26 @@ bfd
  !
 {%   endfor %}
 {% endif %}
-{% if peer is defined and peer is not none %}
+{% if peer is vyos_defined %}
 {%   for peer_name, peer_config in peer.items() %}
- peer {{ peer_name }}{{ ' multihop' if peer_config.multihop is defined }}{{ ' local-address ' + peer_config.source.address if peer_config.source is defined and peer_config.source.address is defined }}{{ ' interface ' + peer_config.source.interface if peer_config.source is defined and peer_config.source.interface is defined }} {{ ' vrf ' + peer_config.vrf if peer_config.vrf is defined and peer_config.vrf is not none }}
+ peer {{ peer_name }}{{ ' multihop' if peer_config.multihop is vyos_defined }}{{ ' local-address ' + peer_config.source.address if peer_config.source.address is vyos_defined }}{{ ' interface ' + peer_config.source.interface if peer_config.source.interface is vyos_defined }} {{ ' vrf ' + peer_config.vrf if peer_config.vrf is vyos_defined }}
   detect-multiplier {{ peer_config.interval.multiplier }}
   receive-interval {{ peer_config.interval.receive }}
   transmit-interval {{ peer_config.interval.transmit }}
-{%     if peer_config.interval.echo_interval is defined and peer_config.interval.echo_interval is not none %}
+{%     if peer_config.interval.echo_interval is vyos_defined %}
   echo transmit-interval {{ peer_config.interval.echo_interval }}
   echo receive-interval {{ peer_config.interval.echo_interval }}
 {%     endif %}
-{%     if peer_config.echo_mode is defined %}
+{%     if peer_config.echo_mode is vyos_defined %}
   echo-mode
 {%     endif %}
-{%     if peer_config.passive is defined %}
+{%     if peer_config.passive is vyos_defined %}
   passive-mode
 {%     endif %}
-{%     if peer_config.profile is defined and peer_config.profile is not none %}
+{%     if peer_config.profile is vyos_defined %}
   profile {{ peer_config.profile }}
 {%     endif %}
-{%     if peer_config.shutdown is defined %}
+{%     if peer_config.shutdown is vyos_defined %}
   shutdown
 {%     else %}
   no shutdown
diff --git a/data/templates/frr/bgpd.frr.tmpl b/data/templates/frr/bgpd.frr.tmpl
index 0bc0fd36e..8baa128a7 100644
--- a/data/templates/frr/bgpd.frr.tmpl
+++ b/data/templates/frr/bgpd.frr.tmpl
@@ -3,113 +3,113 @@
 {% macro bgp_neighbor(neighbor, config, peer_group=false) %}
 {%   if peer_group == true %}
  neighbor {{ neighbor }} peer-group
-{%   elif config.peer_group is defined and config.peer_group is not none %}
+{%   elif config.peer_group is vyos_defined %}
  neighbor {{ neighbor }} peer-group {{ config.peer_group }}
 {%   endif %}
-{%   if config.remote_as is defined and config.remote_as is not none %}
+{%   if config.remote_as is vyos_defined %}
  neighbor {{ neighbor }} remote-as {{ config.remote_as }}
 {%   endif %}
-{%   if config.interface is defined and config.interface.remote_as is defined and config.interface.remote_as is not none %}
+{%   if config.interface.remote_as is vyos_defined %}
  neighbor {{ neighbor }} interface remote-as {{ config.interface.remote_as }}
 {%   endif %}
-{%   if config.advertisement_interval is defined and config.advertisement_interval is not none %}
+{%   if config.advertisement_interval is vyos_defined %}
  neighbor {{ neighbor }} advertisement-interval {{ config.advertisement_interval }}
 {%   endif %}
-{%   if config.bfd is defined %}
+{%   if config.bfd is vyos_defined %}
  neighbor {{ neighbor }} bfd
-{%     if config.bfd.check_control_plane_failure is defined %}
+{%     if config.bfd.check_control_plane_failure is vyos_defined %}
  neighbor {{ neighbor }} bfd check-control-plane-failure
 {%     endif %}
-{%     if config.bfd.profile is defined and config.bfd.profile is not none %}
+{%     if config.bfd.profile is vyos_defined %}
  neighbor {{ neighbor }} bfd profile {{ config.bfd.profile }}
 {%     endif %}
 {%   endif %}
-{%   if config.capability is defined and config.capability is not none %}
-{%     if config.capability.dynamic is defined %}
+{%   if config.capability is vyos_defined %}
+{%     if config.capability.dynamic is vyos_defined %}
  neighbor {{ neighbor }} capability dynamic
 {%     endif %}
-{%     if config.capability.extended_nexthop is defined %}
+{%     if config.capability.extended_nexthop is vyos_defined %}
  neighbor {{ neighbor }} capability extended-nexthop
 {%     endif %}
 {%   endif %}
-{%   if config.description is defined and config.description is not none %}
+{%   if config.description is vyos_defined %}
  neighbor {{ neighbor }} description {{ config.description }}
 {%   endif %}
-{%   if config.disable_capability_negotiation is defined %}
+{%   if config.disable_capability_negotiation is vyos_defined %}
  neighbor {{ neighbor }} dont-capability-negotiate
 {%   endif %}
-{%   if config.ebgp_multihop is defined and config.ebgp_multihop is not none %}
+{%   if config.ebgp_multihop is vyos_defined %}
  neighbor {{ neighbor }} ebgp-multihop {{ config.ebgp_multihop }}
 {%   endif %}
-{%   if config.graceful_restart is defined and config.graceful_restart is not none %}
-{%     if config.graceful_restart == 'enable' %}
+{%   if config.graceful_restart is vyos_defined %}
+{%     if config.graceful_restart is vyos_defined('enable') %}
 {%       set graceful_restart = 'graceful-restart' %}
-{%     elif config.graceful_restart == 'disable' %}
+{%     elif config.graceful_restart is vyos_defined('disable') %}
 {%       set graceful_restart = 'graceful-restart-disable' %}
-{%     elif config.graceful_restart == 'restart-helper' %}
+{%     elif config.graceful_restart is vyos_defined('restart-helper') %}
 {%       set graceful_restart = 'graceful-restart-helper' %}
 {%     endif %}
  neighbor {{ neighbor }} {{ graceful_restart }}
 {%   endif %}
-{%   if config.local_as is defined and config.local_as is not none %}
+{%   if config.local_as is vyos_defined %}
 {%     for local_as, local_as_config in config.local_as.items() %}
 {#       There can be only one local-as value, this is checked in the Python code #}
- neighbor {{ neighbor }} local-as {{ local_as }} {{ 'no-prepend' if local_as_config.no_prepend is defined }} {{ 'replace-as' if local_as_config.no_prepend is defined and local_as_config.no_prepend.replace_as is defined }}
+ neighbor {{ neighbor }} local-as {{ local_as }} {{ 'no-prepend' if local_as_config.no_prepend is vyos_defined }} {{ 'replace-as' if local_as_config.no_prepend is vyos_defined and local_as_config.no_prepend.replace_as is vyos_defined }}
 {%     endfor %}
 {%   endif %}
-{%   if config.override_capability is defined %}
+{%   if config.override_capability is vyos_defined %}
  neighbor {{ neighbor }} override-capability
 {%   endif %}
-{%   if config.passive is defined %}
+{%   if config.passive is vyos_defined %}
  neighbor {{ neighbor }} passive
 {%   endif %}
-{%   if config.password is defined and config.password is not none %}
+{%   if config.password is vyos_defined %}
  neighbor {{ neighbor }} password {{ config.password }}
 {%   endif %}
-{%   if config.port is defined and config.port is not none %}
+{%   if config.port is vyos_defined %}
  neighbor {{ neighbor }} port {{ config.port }}
 {%   endif %}
-{%   if config.shutdown is defined %}
+{%   if config.shutdown is vyos_defined %}
  neighbor {{ neighbor }} shutdown
 {%   endif %}
-{%   if config.solo is defined %}
+{%   if config.solo is vyos_defined %}
  neighbor {{ neighbor }} solo
 {%   endif %}
-{%   if config.strict_capability_match is defined %}
+{%   if config.strict_capability_match is vyos_defined %}
  neighbor {{ neighbor }} strict-capability-match
 {%   endif %}
-{%   if config.ttl_security is defined and config.ttl_security.hops is defined and config.ttl_security.hops is not none %}
+{%   if config.ttl_security.hops is vyos_defined %}
  neighbor {{ neighbor }} ttl-security hops {{ config.ttl_security.hops }}
 {%   endif %}
-{%   if config.timers is defined %}
-{%     if config.timers.connect is defined and config.timers.connect is not none %}
+{%   if config.timers is vyos_defined %}
+{%     if config.timers.connect is vyos_defined %}
  neighbor {{ neighbor }} timers connect {{ config.timers.connect }}
 {%     endif %}
-{%     if config.timers.holdtime is defined and config.timers.keepalive is defined and config.timers.holdtime is not none and config.timers.keepalive is not none %}
+{%     if config.timers.keepalive is vyos_defined and config.timers.holdtime is vyos_defined %}
  neighbor {{ neighbor }} timers {{ config.timers.keepalive }} {{ config.timers.holdtime }}
 {%     endif %}
 {%   endif %}
-{%   if config.update_source is defined and config.update_source is not none %}
+{%   if config.update_source is vyos_defined %}
  neighbor {{ neighbor }} update-source {{ config.update_source }}
 {%   endif %}
-{%   if config.interface is defined and config.interface is not none %}
-{%     if config.interface.peer_group is defined and config.interface.peer_group is not none %}
+{%   if config.interface is vyos_defined %}
+{%     if config.interface.peer_group is vyos_defined %}
  neighbor {{ neighbor }} interface peer-group {{ config.interface.peer_group }}
 {%     endif %}
-{%     if config.interface.source_interface is defined and config.interface.source_interface is not none %}
+{%     if config.interface.source_interface is vyos_defined %}
  neighbor {{ neighbor }} interface {{ config.interface.source_interface }}
 {%     endif %}
-{%     if config.interface.v6only is defined and config.interface.v6only is not none %}
-{%       if config.interface.v6only.peer_group is defined and config.interface.v6only.peer_group is not none %}
+{%     if config.interface.v6only is vyos_defined %}
+{%       if config.interface.v6only.peer_group is vyos_defined %}
  neighbor {{ neighbor }} interface v6only peer-group {{ config.interface.v6only.peer_group }}
 {%       endif %}
-{%       if config.interface.v6only.remote_as is defined and config.interface.v6only.remote_as is not none %}
+{%       if config.interface.v6only.remote_as is vyos_defined %}
  neighbor {{ neighbor }} interface v6only remote-as {{ config.interface.v6only.remote_as }}
 {%       endif %}
 {%     endif %}
 {%   endif %}
  !
-{%   if config.address_family is defined and config.address_family is not none %}
+{%   if config.address_family is vyos_defined %}
 {%     for afi, afi_config in config.address_family.items() %}
 {%       if afi == 'ipv4_unicast' %}
  address-family ipv4 unicast
@@ -134,104 +134,96 @@
 {%       elif afi == 'l2vpn_evpn' %}
  address-family l2vpn evpn
 {%       endif %}
-{%       if afi_config.addpath_tx_all is defined %}
+{%       if afi_config.addpath_tx_all is vyos_defined %}
   neighbor {{ neighbor }} addpath-tx-all-paths
 {%       endif %}
-{%       if afi_config.addpath_tx_per_as is defined %}
+{%       if afi_config.addpath_tx_per_as is vyos_defined %}
   neighbor {{ neighbor }} addpath-tx-bestpath-per-AS
 {%       endif %}
-{%       if afi_config.allowas_in is defined and afi_config.allowas_in is not none %}
-  neighbor {{ neighbor }} allowas-in {{ afi_config.allowas_in.number if afi_config.allowas_in.number is defined }}
+{%       if afi_config.allowas_in is vyos_defined %}
+  neighbor {{ neighbor }} allowas-in {{ afi_config.allowas_in.number if afi_config.allowas_in.number is vyos_defined }}
 {%       endif %}
-{%       if afi_config.as_override is defined %}
+{%       if afi_config.as_override is vyos_defined %}
   neighbor {{ neighbor }} as-override
 {%       endif %}
-{%       if afi_config.conditionally_advertise is defined and afi_config.conditionally_advertise is not none %}
-{%         if afi_config.conditionally_advertise.advertise_map is defined and afi_config.conditionally_advertise.advertise_map is not none %}
+{%       if afi_config.conditionally_advertise is vyos_defined %}
+{%         if afi_config.conditionally_advertise.advertise_map is vyos_defined %}
 {%           set exist_non_exist_map = 'exist-map' %}
-{%           if afi_config.conditionally_advertise.exist_map is defined and afi_config.conditionally_advertise.exist_map is not none %}
+{%           if afi_config.conditionally_advertise.exist_map is vyos_defined %}
 {%             set exist_non_exist_map = 'exist-map ' ~ afi_config.conditionally_advertise.exist_map %}
-{%           elif afi_config.conditionally_advertise.non_exist_map is defined and afi_config.conditionally_advertise.non_exist_map is not none %}
+{%           elif afi_config.conditionally_advertise.non_exist_map is vyos_defined %}
 {%             set exist_non_exist_map = 'non-exist-map ' ~ afi_config.conditionally_advertise.non_exist_map %}
 {%           endif %}
   neighbor {{ neighbor }} advertise-map {{ afi_config.conditionally_advertise.advertise_map }} {{ exist_non_exist_map }}
 {%         endif %}
 {%       endif %}
-{%       if afi_config.remove_private_as is defined %}
+{%       if afi_config.remove_private_as is vyos_defined %}
   neighbor {{ neighbor }} remove-private-AS
 {%       endif %}
-{%       if afi_config.route_reflector_client is defined %}
+{%       if afi_config.route_reflector_client is vyos_defined %}
   neighbor {{ neighbor }} route-reflector-client
 {%       endif %}
-{%       if afi_config.weight is defined and afi_config.weight is not none %}
+{%       if afi_config.weight is vyos_defined %}
   neighbor {{ neighbor }} weight {{ afi_config.weight }}
 {%       endif %}
-{%       if afi_config.attribute_unchanged is defined and afi_config.attribute_unchanged is not none %}
-  neighbor {{ neighbor }} attribute-unchanged {{ 'as-path ' if afi_config.attribute_unchanged.as_path is defined }}{{ 'med ' if afi_config.attribute_unchanged.med is defined }}{{ 'next-hop ' if afi_config.attribute_unchanged.next_hop is defined }}
+{%       if afi_config.attribute_unchanged is vyos_defined %}
+  neighbor {{ neighbor }} attribute-unchanged {{ 'as-path ' if afi_config.attribute_unchanged.as_path is vyos_defined }}{{ 'med ' if afi_config.attribute_unchanged.med is vyos_defined }}{{ 'next-hop ' if afi_config.attribute_unchanged.next_hop is vyos_defined }}
 {%       endif %}
-{%       if afi_config.capability is defined and afi_config.capability.orf is defined and afi_config.capability.orf.prefix_list is defined and afi_config.capability.orf.prefix_list.send is defined %}
+{%       if afi_config.capability.orf.prefix_list.send is vyos_defined %}
   neighbor {{ neighbor }} capability orf prefix-list send
 {%       endif %}
-{%       if afi_config.capability is defined and afi_config.capability.orf is defined and afi_config.capability.orf.prefix_list is defined and afi_config.capability.orf.prefix_list.receive is defined %}
+{%       if afi_config.capability.orf.prefix_list.receive is vyos_defined %}
   neighbor {{ neighbor }} capability orf prefix-list receive
 {%       endif %}
-{%       if afi_config.default_originate is defined %}
-  neighbor {{ neighbor }} default-originate {{ 'route-map ' ~ afi_config.default_originate.route_map if afi_config.default_originate.route_map is defined }}
+{%       if afi_config.default_originate is vyos_defined %}
+  neighbor {{ neighbor }} default-originate {{ 'route-map ' ~ afi_config.default_originate.route_map if afi_config.default_originate.route_map is vyos_defined }}
 {%       endif %}
-{%       if afi_config.distribute_list is defined and afi_config.distribute_list is not none %}
-{%         if afi_config.distribute_list.export is defined and afi_config.distribute_list.export is not none %}
+{%       if afi_config.distribute_list.export is vyos_defined %}
   neighbor {{ neighbor }} distribute-list {{ afi_config.distribute_list.export }} out
-{%         endif %}
-{%         if afi_config.distribute_list.import is defined and afi_config.distribute_list.import is not none %}
+{%       endif %}
+{%       if afi_config.distribute_list.import is vyos_defined %}
   neighbor {{ neighbor }} distribute-list {{ afi_config.distribute_list.import }} in
-{%         endif %}
 {%       endif %}
-{%       if afi_config.filter_list is defined and afi_config.filter_list is not none %}
-{%         if afi_config.filter_list.export is defined and afi_config.filter_list.export is not none %}
+{%       if afi_config.filter_list.export is vyos_defined %}
   neighbor {{ neighbor }} filter-list {{ afi_config.filter_list.export }} out
-{%         endif %}
-{%         if afi_config.filter_list.import is defined and afi_config.filter_list.import is not none %}
+{%       endif %}
+{%       if afi_config.filter_list.import is vyos_defined %}
   neighbor {{ neighbor }} filter-list {{ afi_config.filter_list.import }} in
-{%         endif %}
 {%       endif %}
-{%       if afi_config.maximum_prefix is defined and afi_config.maximum_prefix is not none %}
+{%       if afi_config.maximum_prefix is vyos_defined %}
   neighbor {{ neighbor }} maximum-prefix {{ afi_config.maximum_prefix }}
 {%       endif %}
-{%       if afi_config.maximum_prefix_out is defined and afi_config.maximum_prefix_out is not none %}
+{%       if afi_config.maximum_prefix_out is vyos_defined %}
   neighbor {{ neighbor }} maximum-prefix-out {{ afi_config.maximum_prefix_out }}
 {%       endif %}
-{%       if afi_config.nexthop_self is defined %}
-  neighbor {{ neighbor }} next-hop-self {{ 'force' if afi_config.nexthop_self.force is defined }}
+{%       if afi_config.nexthop_self is vyos_defined %}
+  neighbor {{ neighbor }} next-hop-self {{ 'force' if afi_config.nexthop_self.force is vyos_defined }}
 {%       endif %}
-{%       if afi_config.route_server_client is defined %}
+{%       if afi_config.route_server_client is vyos_defined %}
   neighbor {{ neighbor }} route-server-client
 {%       endif %}
-{%       if afi_config.route_map is defined and afi_config.route_map is not none %}
-{%         if afi_config.route_map.export is defined and afi_config.route_map.export is not none %}
+{%       if afi_config.route_map.export is vyos_defined %}
   neighbor {{ neighbor }} route-map {{ afi_config.route_map.export }} out
-{%         endif %}
-{%         if afi_config.route_map.import is defined and afi_config.route_map.import is not none %}
+{%       endif %}
+{%       if afi_config.route_map.import is vyos_defined %}
   neighbor {{ neighbor }} route-map {{ afi_config.route_map.import }} in
-{%         endif %}
 {%       endif %}
-{%       if afi_config.prefix_list is defined and afi_config.prefix_list is not none %}
-{%         if afi_config.prefix_list.export is defined and afi_config.prefix_list.export is not none %}
+{%       if afi_config.prefix_list.export is vyos_defined %}
   neighbor {{ neighbor }} prefix-list  {{ afi_config.prefix_list.export }} out
-{%         endif %}
-{%         if afi_config.prefix_list.import is defined and afi_config.prefix_list.import is not none %}
+{%       endif %}
+{%       if afi_config.prefix_list.import is vyos_defined %}
   neighbor {{ neighbor }} prefix-list  {{ afi_config.prefix_list.import }} in
-{%         endif %}
 {%       endif %}
-{%       if afi_config.soft_reconfiguration is defined and afi_config.soft_reconfiguration.inbound is defined %}
+{%       if afi_config.soft_reconfiguration.inbound is vyos_defined %}
   neighbor {{ neighbor }} soft-reconfiguration inbound
 {%       endif %}
-{%       if afi_config.unsuppress_map is defined and afi_config.unsuppress_map is not none %}
+{%       if afi_config.unsuppress_map is vyos_defined %}
   neighbor {{ neighbor }} unsuppress-map {{ afi_config.unsuppress_map }}
 {%       endif %}
-{%       if afi_config.disable_send_community is defined and afi_config.disable_send_community.extended is defined %}
+{%       if afi_config.disable_send_community.extended is vyos_defined %}
  no neighbor {{ neighbor }} send-community extended
 {%       endif %}
-{%       if afi_config.disable_send_community is defined and afi_config.disable_send_community.standard is defined %}
+{%       if afi_config.disable_send_community.standard is vyos_defined %}
  no neighbor {{ neighbor }} send-community standard
 {%       endif %}
   neighbor {{ neighbor }} activate
@@ -241,8 +233,8 @@
 {%   endif %}
 {% endmacro %}
 !
-router bgp {{ local_as }} {{ 'vrf ' ~ vrf if vrf is defined and vrf is not none }}
-{% if parameters is defined and parameters.ebgp_requires_policy is defined %}
+router bgp {{ local_as }} {{ 'vrf ' ~ vrf if vrf is vyos_defined }}
+{% if parameters.ebgp_requires_policy is vyos_defined %}
  bgp ebgp-requires-policy
 {% else %}
  no bgp ebgp-requires-policy
@@ -251,7 +243,7 @@ router bgp {{ local_as }} {{ 'vrf ' ~ vrf if vrf is defined and vrf is not none
  no bgp default ipv4-unicast
 {# Workaround for T2100 until we have decided about a migration script #}
  no bgp network import-check
-{% if address_family is defined and address_family is not none %}
+{% if address_family is vyos_defined %}
 {%   for afi, afi_config in address_family.items() %}
  !
 {%     if afi == 'ipv4_unicast' %}
@@ -276,25 +268,25 @@ router bgp {{ local_as }} {{ 'vrf ' ~ vrf if vrf is defined and vrf is not none
  address-family ipv6 flowspec
 {%     elif afi == 'l2vpn_evpn' %}
  address-family l2vpn evpn
-{%     if afi_config.rd is defined and afi_config.rd is not none %}
+{%     if afi_config.rd is vyos_defined %}
   rd {{ afi_config.rd }}
 {%     endif %}
 {%     endif %}
-{%     if afi_config.aggregate_address is defined and afi_config.aggregate_address is not none %}
+{%     if afi_config.aggregate_address is vyos_defined %}
 {%       for aggregate, aggregate_config in afi_config.aggregate_address.items() %}
-  aggregate-address {{ aggregate }}{{ ' as-set' if aggregate_config.as_set is defined }}{{ ' summary-only' if aggregate_config.summary_only is defined }}
-{%         if aggregate_config.route_map is defined and aggregate_config.route_map is not none %}
+  aggregate-address {{ aggregate }}{{ ' as-set' if aggregate_config.as_set is vyos_defined }}{{ ' summary-only' if aggregate_config.summary_only is vyos_defined }}
+{%         if aggregate_config.route_map is vyos_defined %}
   aggregate-address {{ aggregate }} route-map {{ aggregate_config.route_map }}
 {%         endif %}
 {%       endfor %}
 {%     endif %}
-{%     if afi_config.maximum_paths is defined and afi_config.maximum_paths.ebgp is defined and afi_config.maximum_paths.ebgp is not none %}
+{%     if afi_config.maximum_paths.ebgp is vyos_defined %}
   maximum-paths {{ afi_config.maximum_paths.ebgp }}
 {%     endif %}
-{%     if afi_config.maximum_paths is defined and afi_config.maximum_paths.ibgp is defined and afi_config.maximum_paths.ibgp is not none %}
+{%     if afi_config.maximum_paths.ibgp is vyos_defined %}
   maximum-paths ibgp {{ afi_config.maximum_paths.ibgp }}
 {%     endif %}
-{%     if afi_config.redistribute is defined and afi_config.redistribute is not none %}
+{%     if afi_config.redistribute is vyos_defined %}
 {%       for protocol in afi_config.redistribute %}
 {%         if protocol == 'table' %}
   redistribute table {{ afi_config.redistribute[protocol].table }}
@@ -303,135 +295,123 @@ router bgp {{ local_as }} {{ 'vrf ' ~ vrf if vrf is defined and vrf is not none
 {%             if protocol == 'ospfv3' %}
 {%               set redistribution_protocol = 'ospf6' %}
 {%             endif %}
-  redistribute {{ redistribution_protocol }}{% if afi_config.redistribute[protocol].metric is defined %} metric {{ afi_config.redistribute[protocol].metric }}{% endif %}{% if afi_config.redistribute[protocol].route_map is defined %} route-map {{ afi_config.redistribute[protocol].route_map }}{% endif %}
+  redistribute {{ redistribution_protocol }}{% if afi_config.redistribute[protocol].metric is vyos_defined %} metric {{ afi_config.redistribute[protocol].metric }}{% endif %}{% if afi_config.redistribute[protocol].route_map is vyos_defined %} route-map {{ afi_config.redistribute[protocol].route_map }}{% endif %}
 {#######   we need this blank line!! #######}
 
 {%         endif %}
 {%       endfor %}
 {%     endif %}
-{%     if afi_config.network is defined and afi_config.network is not none %}
+{%     if afi_config.network is vyos_defined %}
 {%       for network in afi_config.network %}
-  network {{ network }}{% if afi_config.network[network].route_map is defined %} route-map {{ afi_config.network[network].route_map }}{% endif %}{% if afi_config.network[network].backdoor is defined %} backdoor{% endif %}{% if afi_config.network[network].rd is defined and afi_config.network[network].label is defined%} rd {{ afi_config.network[network].rd }} label {{ afi_config.network[network].label }}{% endif %}
+  network {{ network }}{% if afi_config.network[network].route_map is vyos_defined %} route-map {{ afi_config.network[network].route_map }}{% endif %}{% if afi_config.network[network].backdoor is vyos_defined %} backdoor{% endif %}{% if afi_config.network[network].rd is vyos_defined and afi_config.network[network].label is vyos_defined %} rd {{ afi_config.network[network].rd }} label {{ afi_config.network[network].label }}{% endif %}
 {#######   we need this blank line!! #######}
 
 {%       endfor %}
 {%     endif %}
-{%     if afi_config.advertise is defined and afi_config.advertise is not none %}
+{%     if afi_config.advertise is vyos_defined %}
 {%       for adv_afi, adv_afi_config in afi_config.advertise.items() %}
-{%         if adv_afi_config.unicast is defined and adv_afi_config.unicast is not none %}
-  advertise {{ adv_afi }} unicast {{ 'route-map ' ~ adv_afi_config.unicast.route_map if adv_afi_config.unicast.route_map is defined }}
+{%         if adv_afi_config.unicast is vyos_defined %}
+  advertise {{ adv_afi }} unicast {{ 'route-map ' ~ adv_afi_config.unicast.route_map if adv_afi_config.unicast.route_map is vyos_defined }}
 {%         endif %}
 {%       endfor %}
 {%     endif %}
-{%     if afi_config.distance is defined and afi_config.distance is not none %}
-{%       if afi_config.distance is defined and afi_config.distance.external is defined and afi_config.distance.internal is defined and afi_config.distance.local is defined %}
+{%     if afi_config.distance.external is vyos_defined and afi_config.distance.internal is vyos_defined and afi_config.distance.local is vyos_defined %}
   distance bgp {{ afi_config.distance.external }} {{ afi_config.distance.internal }} {{ afi_config.distance.local }}
-{%       endif %}
-{%       if afi_config.distance.prefix is defined and afi_config.distance.prefix is not none %}
-{%         for prefix in afi_config.distance.prefix %}
+{%     endif %}
+{%     if afi_config.distance.prefix is vyos_defined %}
+{%       for prefix in afi_config.distance.prefix %}
   distance {{ afi_config.distance.prefix[prefix].distance }} {{ prefix }}
-{%         endfor %}
-{%       endif %}
+{%       endfor %}
 {%     endif %}
-{%     if afi_config.export is defined and afi_config.export.vpn is defined %}
+{%     if afi_config.export.vpn is vyos_defined %}
   export vpn
 {%     endif %}
-{%     if afi_config.import is defined and afi_config.import is not none %}
-{%       if afi_config.import.vpn is defined %}
+{%     if afi_config.import.vpn is vyos_defined %}
   import vpn
-{%       endif %}
-{%       if afi_config.import.vrf is defined and afi_config.import.vrf is not none %}
-{%         for vrf in afi_config.import.vrf %}
+{%     endif %}
+{%     if afi_config.import.vrf is vyos_defined %}
+{%       for vrf in afi_config.import.vrf %}
   import vrf {{ vrf }}
-{%         endfor %}
-{%       endif %}
+{%       endfor %}
 {%     endif %}
-{%     if afi_config.label is defined and afi_config.label.vpn is defined and afi_config.label.vpn.export is defined and afi_config.label.vpn.export is not none %}
+{%     if afi_config.label.vpn.export is vyos_defined %}
   label vpn export {{ afi_config.label.vpn.export }}
 {%     endif %}
-{%     if afi_config.local_install is defined and afi_config.local_install is not none %}
+{%     if afi_config.local_install is vyos_defined %}
 {%       for interface in afi_config.local_install.interface %}
   local-install {{ interface }}
 {%       endfor %}
 {%     endif %}
-{%     if afi_config.advertise_all_vni is defined %}
+{%     if afi_config.advertise_all_vni is vyos_defined %}
   advertise-all-vni
 {%     endif %}
-{%     if afi_config.advertise_default_gw is defined %}
+{%     if afi_config.advertise_default_gw is vyos_defined %}
   advertise-default-gw
 {%     endif %}
-{%     if afi_config.advertise_pip is defined and afi_config.advertise_pip is not none %}
+{%     if afi_config.advertise_pip is vyos_defined %}
   advertise-pip ip {{ afi_config.advertise_pip }}
 {%     endif %}
-{%     if afi_config.advertise_svi_ip is defined %}
+{%     if afi_config.advertise_svi_ip is vyos_defined %}
   advertise-svi-ip
 {%     endif %}
-{%     if afi_config.rt_auto_derive is defined %}
+{%     if afi_config.rt_auto_derive is vyos_defined %}
   autort rfc8365-compatible
 {%     endif %}
-{%     if afi_config.flooding is defined and afi_config.flooding.disable is defined %}
+{%     if afi_config.flooding.disable is vyos_defined %}
   flooding disable
 {%     endif %}
-{%     if afi_config.flooding is defined and afi_config.flooding.head_end_replication is defined %}
+{%     if afi_config.flooding.head_end_replication is vyos_defined %}
   flooding head-end-replication
 {%     endif %}
-{%     if afi_config.rd is defined and afi_config.rd.vpn is defined and afi_config.rd.vpn.export is defined %}
+{%     if afi_config.rd.vpn.export is vyos_defined %}
   rd vpn export {{ afi_config.rd.vpn.export }}
 {%     endif %}
-{%     if afi_config.route_target is defined and afi_config.route_target is not none %}
-{%       if afi_config.route_target.vpn is defined and afi_config.route_target.vpn is not none %}
-{%         if afi_config.route_target.vpn.both is defined and afi_config.route_target.vpn.both is not none %}
+{%     if afi_config.route_target.vpn.both is vyos_defined %}
   route-target vpn both {{ afi_config.route_target.vpn.both }}
-{%         else %}
-{%           if afi_config.route_target.vpn.export is defined and afi_config.route_target.vpn.export is not none %}
+{%     else %}
+{%       if afi_config.route_target.vpn.export is vyos_defined %}
   route-target vpn export {{ afi_config.route_target.vpn.export }}
-{%           endif %}
-{%           if afi_config.route_target.vpn.import is defined and afi_config.route_target.vpn.import is not none %}
+{%       endif %}
+{%       if afi_config.route_target.vpn.import is vyos_defined %}
   route-target vpn import {{ afi_config.route_target.vpn.import }}
-{%           endif %}
-{%         endif %}
 {%       endif %}
-{%       if afi_config.route_target.both is defined and afi_config.route_target.both is not none %}
+{%     endif %}
+{%     if afi_config.route_target.both is vyos_defined %}
   route-target both {{ afi_config.route_target.both }}
-{%       else %}
-{%         if afi_config.route_target.export is defined and afi_config.route_target.export is not none %}
+{%     else %}
+{%       if afi_config.route_target.export is vyos_defined %}
   route-target export {{ afi_config.route_target.export }}
-{%         endif %}
-{%         if afi_config.route_target.import is defined and afi_config.route_target.import is not none %}
+{%       endif %}
+{%       if afi_config.route_target.import is vyos_defined %}
   route-target import {{ afi_config.route_target.import }}
-{%         endif %}
 {%       endif %}
 {%     endif %}
-{%     if afi_config.route_map is defined and afi_config.route_map.vpn is defined and afi_config.route_map.vpn is not none %}
-{%       if afi_config.route_map.vpn.export is defined and afi_config.route_map.vpn.export is not none %}
+{%     if afi_config.route_map.vpn.export is vyos_defined %}
   route-map vpn export {{ afi_config.route_map.vpn.export }}
-{%       endif %}
-{%       if afi_config.route_map.vpn.import is defined and afi_config.route_map.vpn.import is not none %}
+{%     endif %}
+{%     if afi_config.route_map.vpn.import is vyos_defined %}
   route-map vpn import {{ afi_config.route_map.vpn.import }}
-{%       endif %}
 {%     endif %}
-{%     if afi_config.vni is defined and afi_config.vni is not none %}
+{%     if afi_config.vni is vyos_defined %}
 {%       for vni, vni_config in afi_config.vni.items() %}
   vni {{ vni }}
-{%         if vni_config.advertise_default_gw is defined %}
+{%         if vni_config.advertise_default_gw is vyos_defined %}
    advertise-default-gw
 {%         endif %}
-{%     if vni_config.advertise_svi_ip is defined %}
+{%     if vni_config.advertise_svi_ip is vyos_defined %}
    advertise-svi-ip
 {%     endif %}
-{%     if vni_config.rd is defined and vni_config.rd is not none %}
+{%     if vni_config.rd is vyos_defined %}
    rd {{ vni_config.rd }}
 {%     endif %}
-{%     if vni_config.route_target is defined and vni_config.route_target is not none %}
-{%       if vni_config.route_target.both is defined and vni_config.route_target.both is not none %}
+{%     if vni_config.route_target.both is vyos_defined %}
    route-target both {{ vni_config.route_target.both }}
-{%       endif %}
-{%       if vni_config.route_target.export is defined and vni_config.route_target.export is not none %}
+{%     endif %}
+{%     if vni_config.route_target.export is vyos_defined %}
    route-target export {{ vni_config.route_target.export }}
-{%       endif %}
-{%       if vni_config.route_target.import is defined and vni_config.route_target.import is not none %}
+{%     endif %}
+{%     if vni_config.route_target.import is vyos_defined %}
    route-target import {{ vni_config.route_target.import }}
-{%       endif %}
 {%     endif %}
   exit-vni
 {%       endfor %}
@@ -440,128 +420,116 @@ router bgp {{ local_as }} {{ 'vrf ' ~ vrf if vrf is defined and vrf is not none
 {%   endfor %}
 {% endif %}
  !
-{% if peer_group is defined and peer_group is not none %}
+{% if peer_group is vyos_defined %}
 {%   for peer, config in peer_group.items() %}
 {{ bgp_neighbor(peer, config, true) }}
 {%   endfor %}
 {% endif %}
  !
-{% if neighbor is defined and neighbor is not none %}
+{% if neighbor is vyos_defined %}
 {%   for peer, config in neighbor.items() %}
 {{ bgp_neighbor(peer, config) }}
 {%   endfor %}
 {% endif %}
  !
-{% if listen is defined %}
-{%   if listen.limit is defined and listen.limit is not none %}
+{% if listen.limit is vyos_defined %}
  bgp listen limit {{ listen.limit }}
-{%   endif %}
+{% endif %}
+{% if listen.range is vyos_defined %}
 {%   for prefix, options in listen.range.items() %}
-{%     if options.peer_group is defined and options.peer_group is not none %}
+{%     if options.peer_group is vyos_defined %}
  bgp listen range {{ prefix }} peer-group {{ options.peer_group }}
 {%     endif %}
 {%   endfor %}
 {% endif %}
-{% if parameters is defined %}
-{%   if parameters.always_compare_med is defined %}
+{% if parameters.always_compare_med is vyos_defined %}
  bgp always-compare-med
-{%   endif %}
-{%   if parameters.bestpath is defined and parameters.bestpath is not none %}
-{%     if parameters.bestpath.as_path is defined and parameters.bestpath.as_path is not none %}
-{%       for option in parameters.bestpath.as_path %}
+{% endif %}
+{% if parameters.bestpath.as_path is vyos_defined %}
+{%   for option in parameters.bestpath.as_path %}
 {# replace is required for multipath-relax option #}
  bgp bestpath as-path {{ option|replace('_', '-') }}
-{%       endfor %}
-{%     endif %}
-{%     if parameters.bestpath.bandwidth is defined and parameters.bestpath.bandwidth is not none %}
+{%   endfor %}
+{% endif %}
+{% if parameters.bestpath.bandwidth is vyos_defined %}
  bgp bestpath bandwidth {{ parameters.bestpath.bandwidth }}
-{%     endif %}
-{%     if parameters.bestpath.compare_routerid is defined %}
+{% endif %}
+{% if parameters.bestpath.compare_routerid is vyos_defined %}
  bgp bestpath compare-routerid
-{%     endif %}
-{%     if parameters.bestpath.med is defined and parameters.bestpath.med is not none %}
- bgp bestpath med {{ 'confed' if parameters.bestpath.med.confed is defined }} {{ 'missing-as-worst' if parameters.bestpath.med.missing_as_worst is defined }}
-{%     endif %}
-{%   endif %}
-{%   if parameters.cluster_id is defined and parameters.cluster_id is not none %}
+{% endif %}
+{% if parameters.bestpath.med is vyos_defined %}
+ bgp bestpath med {{ 'confed' if parameters.bestpath.med.confed is vyos_defined }} {{ 'missing-as-worst' if parameters.bestpath.med.missing_as_worst is vyos_defined }}
+{% endif %}
+{% if parameters.cluster_id is vyos_defined %}
  bgp cluster-id {{ parameters.cluster_id }}
-{%   endif %}
-{%   if parameters.conditional_advertisement is defined and parameters.conditional_advertisement is not none %}
-{%     if parameters.conditional_advertisement.timer is defined and parameters.conditional_advertisement.timer is not none %}
+{% endif %}
+{% if parameters.conditional_advertisement.timer is vyos_defined %}
  bgp conditional-advertisement timer {{ parameters.conditional_advertisement.timer }}
-{%     endif %}
-{%   endif %}
-{%   if parameters.confederation is defined and parameters.confederation is not none %}
-{%     if parameters.confederation.identifier is defined and parameters.confederation.identifier is not none %}
+{% endif %}
+{% if parameters.confederation.identifier is vyos_defined %}
  bgp confederation identifier {{ parameters.confederation.identifier }}
-{%     endif %}
-{%     if parameters.confederation.peers is defined and parameters.confederation.peers is not none %}
+{% endif %}
+{% if parameters.confederation.peers is vyos_defined %}
  bgp confederation peers {{ parameters.confederation.peers | join(' ') }}
-{%     endif %}
-{%   endif %}
-{%   if parameters.dampening is defined and parameters.dampening is defined and parameters.dampening.half_life is defined and parameters.dampening.half_life is not none %}
+{% endif %}
+{% if parameters.dampening.half_life is vyos_defined %}
 {# Doesn't work in current FRR configuration; vtysh (bgp dampening 16 751 2001 61) #}
- bgp dampening {{ parameters.dampening.half_life }} {{ parameters.dampening.re_use if parameters.dampening.re_use is defined }} {{ parameters.dampening.start_suppress_time if parameters.dampening.start_suppress_time is defined }} {{ parameters.dampening.max_suppress_time if parameters.dampening.max_suppress_time is defined }}
-{%   endif %}
-{%   if parameters.default is defined and parameters.default is not none %}
-{%     if parameters.default.local_pref is defined and parameters.default.local_pref is not none %}
+ bgp dampening {{ parameters.dampening.half_life }} {{ parameters.dampening.re_use if parameters.dampening.re_use is vyos_defined }} {{ parameters.dampening.start_suppress_time if parameters.dampening.start_suppress_time is vyos_defined }} {{ parameters.dampening.max_suppress_time if parameters.dampening.max_suppress_time is vyos_defined }}
+{% endif %}
+{% if parameters.default.local_pref is vyos_defined %}
  bgp default local-preference {{ parameters.default.local_pref }}
-{%     endif %}
-{%   endif %}
-{%   if parameters.deterministic_med is defined %}
+{% endif %}
+{% if parameters.deterministic_med is vyos_defined %}
  bgp deterministic-med
-{%   endif %}
-{%   if parameters.distance is defined and parameters.distance is not none %}
-{%     if parameters.distance.global is defined and parameters.distance.global.external is defined and parameters.distance.global.internal is defined and parameters.distance.global.local is defined %}
+{% endif %}
+{% if parameters.distance.global.external is vyos_defined and parameters.distance.global.internal is vyos_defined and parameters.distance.global.local is vyos_defined %}
   distance bgp {{ parameters.distance.global.external }} {{ parameters.distance.global.internal }} {{ parameters.distance.global.local }}
-{%     endif %}
-{%     if parameters.distance.prefix is defined and parameters.distance.prefix is not none %}
-{%       for prefix in parameters.distance.prefix %}
+{% endif %}
+{% if parameters.distance.prefix is vyos_defined %}
+{%   for prefix in parameters.distance.prefix %}
   distance {{ parameters.distance.prefix[prefix].distance }} {{ prefix }}
-{%       endfor %}
-{%     endif %}
-{%   endif %}
-{%   if parameters.fast_convergence is defined %}
+{%   endfor %}
+{% endif %}
+{% if parameters.fast_convergence is vyos_defined %}
   bgp fast-convergence
-{%   endif %}
-{%   if parameters.graceful_restart is defined %}
- bgp graceful-restart {{ 'stalepath-time ' ~ parameters.graceful_restart.stalepath_time if parameters.graceful_restart.stalepath_time is defined }}
-{%   endif %}
-{%   if parameters.graceful_shutdown is defined %}
+{% endif %}
+{% if parameters.graceful_restart is vyos_defined %}
+ bgp graceful-restart {{ 'stalepath-time ' ~ parameters.graceful_restart.stalepath_time if parameters.graceful_restart.stalepath_time is vyos_defined }}
+{% endif %}
+{% if parameters.graceful_shutdown is vyos_defined %}
  bgp graceful-shutdown
-{%   endif %}
-{%   if parameters.log_neighbor_changes is defined %}
+{% endif %}
+{% if parameters.log_neighbor_changes is vyos_defined %}
  bgp log-neighbor-changes
-{%   endif %}
-{%   if parameters.minimum_holdtime is defined and parameters.minimum_holdtime is not none %}
+{% endif %}
+{% if parameters.minimum_holdtime is vyos_defined %}
  bgp minimum-holdtime {{ parameters.minimum_holdtime }}
-{%   endif %}
-{%   if parameters.network_import_check is defined %}
+{% endif %}
+{% if parameters.network_import_check is vyos_defined %}
  bgp network import-check
-{%   endif %}
-{%   if parameters.no_client_to_client_reflection is defined %}
+{% endif %}
+{% if parameters.no_client_to_client_reflection is vyos_defined %}
  no bgp client-to-client reflection
-{%   endif %}
-{%   if parameters.no_fast_external_failover is defined %}
+{% endif %}
+{% if parameters.no_fast_external_failover is vyos_defined %}
  no bgp fast-external-failover
-{%   endif %}
-{%   if parameters.no_suppress_duplicates is defined %}
+{% endif %}
+{% if parameters.no_suppress_duplicates is vyos_defined %}
  no bgp suppress-duplicates
-{%   endif %}
-{%   if parameters.reject_as_sets is defined %}
+{% endif %}
+{% if parameters.reject_as_sets is vyos_defined %}
  bgp reject-as-sets
-{%   endif %}
-{%   if parameters.router_id is defined and parameters.router_id is not none %}
+{% endif %}
+{% if parameters.router_id is vyos_defined and parameters.router_id is not none %}
  bgp router-id {{ parameters.router_id }}
-{%   endif %}
-{%   if parameters.shutdown is defined %}
+{% endif %}
+{% if parameters.shutdown is vyos_defined %}
  bgp shutdown
-{%   endif %}
-{%   if parameters.suppress_fib_pending is defined %}
+{% endif %}
+{% if parameters.suppress_fib_pending is vyos_defined %}
  bgp suppress-fib-pending
-{%   endif %}
 {% endif %}
-{% if timers is defined and timers.keepalive is defined and timers.holdtime is defined %}
+{% if timers.keepalive is vyos_defined and timers.holdtime is vyos_defined %}
  timers bgp {{ timers.keepalive }} {{ timers.holdtime }}
 {% endif %}
 exit
diff --git a/data/templates/frr/isisd.frr.tmpl b/data/templates/frr/isisd.frr.tmpl
index c68dda443..238541903 100644
--- a/data/templates/frr/isisd.frr.tmpl
+++ b/data/templates/frr/isisd.frr.tmpl
@@ -1,46 +1,48 @@
 !
-{% if interface is defined and interface is not none %}
+{% if interface is vyos_defined %}
 {%   for iface, iface_config in interface.items() %}
 interface {{ iface }}
  ip router isis VyOS
  ipv6 router isis VyOS
-{%     if iface_config.bfd is defined %}
+{%     if iface_config.bfd is vyos_defined %}
  isis bfd
-{%       if iface_config.bfd.profile is defined and iface_config.bfd.profile is not none %}
+{%       if iface_config.bfd.profile is vyos_defined %}
  isis bfd profile {{ iface_config.bfd.profile }}
 {%       endif %}
 {%     endif %}
-{%     if iface_config.network is defined and iface_config.network.point_to_point is defined %}
+{%     if iface_config.network.point_to_point is vyos_defined %}
  isis network point-to-point
 {%     endif %}
-{%     if iface_config.circuit_type is defined %}
+{%     if iface_config.circuit_type is vyos_defined %}
  isis circuit-type {{ iface_config.circuit_type }}
 {%     endif %}
-{%     if iface_config.hello_interval is defined and iface_config.hello_interval is not none %}
+{%     if iface_config.hello_interval is vyos_defined %}
  isis hello-interval {{ iface_config.hello_interval }}
 {%     endif %}
-{%     if iface_config.hello_multiplier is defined and iface_config.hello_multiplier is not none %}
+{%     if iface_config.hello_multiplier is vyos_defined %}
  isis hello-multiplier {{ iface_config.hello_multiplier }}
 {%     endif %}
-{%     if iface_config.hello_padding is defined %}
+{%     if iface_config.hello_padding is vyos_defined %}
  isis hello padding
 {%     endif %}
-{%     if iface_config.metric is defined and iface_config.metric is not none %}
+{%     if iface_config.metric is vyos_defined %}
  isis metric {{ iface_config.metric }}
 {%     endif %}
-{%     if iface_config.passive is defined %}
+{%     if iface_config.passive is vyos_defined %}
  isis passive
 {%     endif %}
-{%     if iface_config.password is defined and iface_config.password.plaintext_password is defined and iface_config.password.plaintext_password is not none %}
+{%     if iface_config.password.md5 is vyos_defined %}
+ isis password md5 {{ iface_config.password.md5 }}
+{%     elif iface_config.password.plaintext_password is vyos_defined %}
  isis password clear {{ iface_config.password.plaintext_password }}
 {%     endif %}
-{%     if iface_config.priority is defined and iface_config.priority is not none %}
+{%     if iface_config.priority is vyos_defined %}
  isis priority {{ iface_config.priority }}
 {%     endif %}
-{%     if iface_config.psnp_interval is defined and iface_config.psnp_interval is not none %}
+{%     if iface_config.psnp_interval is vyos_defined %}
  isis psnp-interval {{ iface_config.psnp_interval }}
 {%     endif %}
-{%     if iface_config.no_three_way_handshake is defined %}
+{%     if iface_config.no_three_way_handshake is vyos_defined %}
  no isis three-way-handshake
 {%     endif %}
 exit
@@ -48,98 +50,95 @@ exit
 {%   endfor %}
 {% endif %}
 !
-router isis VyOS {{ 'vrf ' + vrf if vrf is defined and vrf is not none }}
+router isis VyOS {{ 'vrf ' + vrf if vrf is vyos_defined }}
  net {{ net }}
-{% if dynamic_hostname is defined %}
+{% if dynamic_hostname is vyos_defined %}
  hostname dynamic
 {% endif %}
-{% if purge_originator is defined %}
+{% if purge_originator is vyos_defined %}
  purge-originator
 {% endif %}
-{% if set_attached_bit is defined %}
+{% if set_attached_bit is vyos_defined %}
  set-attached-bit
 {% endif %}
-{% if set_overload_bit is defined %}
+{% if set_overload_bit is vyos_defined %}
  set-overload-bit
 {% endif %}
-{% if domain_password is defined and domain_password is not none %}
-{%   if domain_password.md5 is defined and domain_password.md5 is not none %}
+{% if domain_password.md5 is vyos_defined %}
  domain-password md5 {{ domain_password.plaintext_password }}
-{%   elif domain_password.plaintext_password is defined and domain_password.plaintext_password is not none %}
+{% elif domain_password.plaintext_password is vyos_defined %}
  domain-password clear {{ domain_password.plaintext_password }}
-{%   endif %}
 {% endif %}
-{% if log_adjacency_changes is defined %}
+{% if log_adjacency_changes is vyos_defined %}
  log-adjacency-changes
 {% endif %}
-{% if lsp_gen_interval is defined and lsp_gen_interval is not none %}
+{% if lsp_gen_interval is vyos_defined %}
  lsp-gen-interval {{ lsp_gen_interval }}
 {% endif %}
-{% if lsp_mtu is defined and lsp_mtu is not none %}
+{% if lsp_mtu is vyos_defined %}
  lsp-mtu {{ lsp_mtu }}
 {% endif %}
-{% if lsp_refresh_interval is defined and lsp_refresh_interval is not none %}
+{% if lsp_refresh_interval is vyos_defined %}
  lsp-refresh-interval  {{ lsp_refresh_interval }}
 {% endif %}
-{% if max_lsp_lifetime is defined and max_lsp_lifetime is not none %}
+{% if max_lsp_lifetime is vyos_defined %}
  max-lsp-lifetime {{ max_lsp_lifetime }}
 {% endif %}
-{% if spf_interval is defined and spf_interval is not none %}
+{% if spf_interval is vyos_defined %}
  spf-interval {{ spf_interval }}
 {% endif %}
-{% if traffic_engineering is defined and traffic_engineering is not none %}
-{%   if traffic_engineering.enable is defined %}
+{% if traffic_engineering.enable is vyos_defined %}
  mpls-te on
-{%   endif %}
-{%   if traffic_engineering.address is defined %}
+{% endif %}
+{% if traffic_engineering.address is vyos_defined %}
  mpls-te router-address {{ traffic_engineering.address }}
+{% endif %}
+{% if traffic_engineering.inter_as is vyos_defined %}
+{%   set level = '' %}
+{%   if traffic_engineering.inter_as.level_1 is vyos_defined %}
+{%     set level = ' level-1' %}
 {%   endif %}
-{%   if traffic_engineering.inter_as is defined %}
-{%     if traffic_engineering.inter_as.level_1 is defined %}
- mpls-te inter-as level-1
-{%     endif %}
-{%     if traffic_engineering.inter_as.level_1_2 is defined %}
- mpls-te inter-as level-1-2
-{%     endif %}
-{%     if traffic_engineering.inter_as.level_2 is defined %}
- mpls-te inter-as level-2-only
-{%     endif %}
-{%   else %}
- mpls-te inter-as
+{%   if traffic_engineering.inter_as.level_1_2 is vyos_defined %}
+{%     set level = ' level-1-2' %}
+{%   endif %}
+{%   if traffic_engineering.inter_as.level_2 is vyos_defined %}
+{%     set level = ' level-2-only' %}
 {%   endif %}
+ mpls-te inter-as{{ level }}
 {% endif %}
-{% if segment_routing is defined %}
-{%   if segment_routing.enable is defined %}
+{% if segment_routing is vyos_defined %}
+{%   if segment_routing.enable is vyos_defined %}
  segment-routing on
 {%   endif %}
-{%   if segment_routing.maximum_label_depth is defined %}
+{%   if segment_routing.maximum_label_depth is vyos_defined %}
  segment-routing node-msd {{ segment_routing.maximum_label_depth }}
 {%   endif %}
-{%   if segment_routing.global_block is defined %}
+{%   if segment_routing.global_block is vyos_defined %}
+{%     if segment_routing.local_block is vyos_defined %}
+ segment-routing global-block {{ segment_routing.global_block.low_label_value }} {{ segment_routing.global_block.high_label_value }} local-block {{ segment_routing.local_block.low_label_value }} {{ segment_routing.local_block.high_label_value }}
+{%     else %}
  segment-routing global-block {{ segment_routing.global_block.low_label_value }} {{ segment_routing.global_block.high_label_value }}
+{%     endif %}
 {%   endif %}
-{%   if segment_routing.local_block is defined %}
- segment-routing local-block {{ segment_routing.global_block.low_label_value }} {{ segment_routing.local_block.high_label_value }}
-{%   endif %}
-{%   if segment_routing.prefix is defined %}
+{%   if segment_routing.prefix is vyos_defined %}
 {%     for prefixes in segment_routing.prefix %}
-{%       if segment_routing.prefix[prefixes].absolute is defined %}
-{%         if segment_routing.prefix[prefixes].absolute.value is defined %}
+{%       if segment_routing.prefix[prefixes].absolute is vyos_defined %}
+{%         if segment_routing.prefix[prefixes].absolute.value is vyos_defined %}
  segment-routing prefix {{ prefixes }} absolute {{ segment_routing.prefix[prefixes].absolute.value }}
-{%           if segment_routing.prefix[prefixes].absolute.explicit_null is defined %}
+{%           if segment_routing.prefix[prefixes].absolute.explicit_null is vyos_defined %}
  segment-routing prefix {{ prefixes }} absolute {{ segment_routing.prefix[prefixes].absolute.value }} explicit-null
 {%           endif %}
-{%           if segment_routing.prefix[prefixes].absolute.no_php_flag is defined %}
+{%           if segment_routing.prefix[prefixes].absolute.no_php_flag is vyos_defined %}
  segment-routing prefix {{ prefixes }} absolute {{ segment_routing.prefix[prefixes].absolute.value }} no-php-flag
 {%           endif %}
 {%         endif %}
-{%         if segment_routing.prefix[prefixes].index is defined %}
-{%           if segment_routing.prefix[prefixes].index.value is defined %}
+{%         if segment_routing.prefix[prefixes].index is vyos_defined %}
+{%           if segment_routing.prefix[prefixes].index.value is vyos_defined %}
  segment-routing prefix {{ prefixes }} index {{ segment_routing.prefix[prefixes].index.value }}
-{%             if segment_routing.prefix[prefixes].index.explicit_null is defined %}
+{%             if segment_routing.prefix[prefixes].index.explicit_null is vyos_defined %}
  segment-routing prefix {{ prefixes }} index {{ segment_routing.prefix[prefixes].index.value }} explicit-null
 {%             endif %}
-{%             if segment_routing.prefix[prefixes].index.no_php_flag is defined %}
+{%             if segment_routing.prefix[prefixes].index.no_php_flag is vyos_defined %}
  segment-routing prefix {{ prefixes }} index {{ segment_routing.prefix[prefixes].index.value }} no-php-flag
 {%             endif %}
 {%           endif %}
@@ -148,57 +147,51 @@ router isis VyOS {{ 'vrf ' + vrf if vrf is defined and vrf is not none }}
 {%     endfor %}
 {%   endif %}
 {% endif %}
-{% if spf_delay_ietf is defined and spf_delay_ietf.init_delay is defined and spf_delay_ietf.init_delay is not none %}
+{% if spf_delay_ietf.init_delay is vyos_defined %}
  spf-delay-ietf init-delay {{ spf_delay_ietf.init_delay }} short-delay {{ spf_delay_ietf.short_delay }} long-delay {{ spf_delay_ietf.long_delay }} holddown {{ spf_delay_ietf.holddown }} time-to-learn {{ spf_delay_ietf.time_to_learn }}
 {% endif %}
-{% if area_password is defined and area_password is not none %}
-{%   if area_password.md5 is defined and area_password.md5 is not none %}
+{% if area_password.md5 is vyos_defined %}
  area-password md5 {{ area_password.md5 }}
-{%   elif area_password.plaintext_password is defined and area_password.plaintext_password is not none %}
+{% elif area_password.plaintext_password is vyos_defined %}
  area-password clear {{ area_password.plaintext_password }}
-{%   endif %}
 {% endif %}
-{% if default_information is defined and default_information.originate is defined and default_information.originate is not none %}
+{% if default_information.originate is vyos_defined %}
 {%   for afi, afi_config in default_information.originate.items() %}
 {%     for level, level_config in afi_config.items() %}
- default-information originate {{ afi }} {{ level | replace('_', '-') }} {{ 'always' if level_config.always is defined }} {{ 'route-map ' ~ level_config.route_map if level_config.route_map is defined }} {{ 'metric ' ~ level_config.metric if level_config.metric is defined }}
+ default-information originate {{ afi }} {{ level | replace('_', '-') }} {{ 'always' if level_config.always is vyos_defined }} {{ 'route-map ' ~ level_config.route_map if level_config.route_map is vyos_defined }} {{ 'metric ' ~ level_config.metric if level_config.metric is vyos_defined }}
 {%     endfor %}
 {%   endfor %}
 {% endif %}
-{% if redistribute is defined %}
-{%   if redistribute.ipv4 is defined and redistribute.ipv4 is not none %}
-{%     for protocol, protocol_options in redistribute.ipv4.items() %}
-{%       for level, level_config in protocol_options.items() %}
-{%         if level_config.metric is defined and level_config.metric is not none %}
+{% if redistribute.ipv4 is vyos_defined %}
+{%   for protocol, protocol_options in redistribute.ipv4.items() %}
+{%     for level, level_config in protocol_options.items() %}
+{%       if level_config.metric is vyos_defined %}
  redistribute ipv4 {{ protocol }} {{ level | replace('_', '-') }} metric {{ level_config.metric }}
-{%         elif level_config.route_map is defined and level_config.route_map is not none %}
+{%       elif level_config.route_map is vyos_defined %}
  redistribute ipv4 {{ protocol }} {{ level | replace('_', '-') }} route-map {{ level_config.route_map }}
-{%         else %}
+{%       else %}
  redistribute ipv4 {{ protocol }} {{ level | replace('_', '-') }}
-{%         endif %}
-{%       endfor %}
+{%       endif %}
 {%     endfor %}
-{%   endif %}
-{%   if redistribute.ipv6 is defined and redistribute.ipv6 is not none %}
-{%     for protocol, protocol_options in redistribute.ipv6.items() %}
-{%       for level, level_config in protocol_options.items() %}
-{%         if level_config.metric is defined and level_config.metric is not none %}
+{%   endfor %}
+{% endif %}
+{% if redistribute.ipv6 is vyos_defined %}
+{%   for protocol, protocol_options in redistribute.ipv6.items() %}
+{%     for level, level_config in protocol_options.items() %}
+{%       if level_config.metric is vyos_defined %}
  redistribute ipv6 {{ protocol }} {{ level | replace('_', '-') }} metric {{ level_config.metric }}
-{%         elif level_config.route_map is defined and level_config.route_map is not none %}
+{%       elif level_config.route_map is vyos_defined %}
  redistribute ipv6 {{ protocol }} {{ level | replace('_', '-') }} route-map {{ level_config.route_map }}
-{%         else %}
+{%       else %}
  redistribute ipv6 {{ protocol }} {{ level | replace('_', '-') }}
-{%         endif %}
-{%       endfor %}
+{%       endif %}
 {%     endfor %}
-{%   endif %}
+{%   endfor %}
 {% endif %}
-{% if level is defined and level is not none %}
-{%   if level == 'level-2'  %}
+{% if level is vyos_defined('level-2') %}
  is-type level-2-only
-{%   else %}
+{% elif level is vyos_defined %}
  is-type {{ level }}
-{%   endif %}
 {% endif %}
 exit
 !
\ No newline at end of file
diff --git a/data/templates/frr/ldpd.frr.tmpl b/data/templates/frr/ldpd.frr.tmpl
index 537ea4025..5a67b5cdf 100644
--- a/data/templates/frr/ldpd.frr.tmpl
+++ b/data/templates/frr/ldpd.frr.tmpl
@@ -1,190 +1,157 @@
 !
-{% if ldp is defined %}
+{% if ldp is vyos_defined %}
 mpls ldp
-{%     if ldp.router_id is defined %}
+{%   if ldp.router_id is vyos_defined %}
  router-id {{ ldp.router_id }}
-{%     endif %}
-{%     if ldp.parameters is defined %}
-{%         if ldp.parameters.cisco_interop_tlv is defined %}
+{%   endif %}
+{%   if ldp.parameters.cisco_interop_tlv is vyos_defined %}
  dual-stack cisco-interop
-{%         endif %}
-{%         if ldp.parameters.transport_prefer_ipv4 is defined%}
+{%   endif %}
+{%   if ldp.parameters.transport_prefer_ipv4 is vyos_defined %}
  dual-stack transport-connection prefer ipv4
-{%         endif %}
-{%         if ldp.parameters.ordered_control is defined%}
+{%   endif %}
+{%   if ldp.parameters.ordered_control is vyos_defined %}
  ordered-control
-{%         endif %}
-{%     endif %}
-{%     if ldp.neighbor is defined %}
-{%         for neighbors in ldp.neighbor %}
-{%             if ldp.neighbor[neighbors].password is defined %}
- neighbor {{ neighbors }} password {{ ldp.neighbor[neighbors].password }}
-{%             endif %}
-{%             if ldp.neighbor[neighbors].ttl_security is defined %}
-{%                 if 'disable' in ldp.neighbor[neighbors].ttl_security %}
+{%   endif %}
+{%   if ldp.neighbor is vyos_defined %}
+{%     for neighbor, neighbor_config in ldp.neighbor %}
+{%       if neighbor_config.password is vyos_defined %}
+ neighbor {{ neighbors }} password {{ neighbor_config.password }}
+{%       endif %}
+{%       if neighbor_config.ttl_security is vyos_defined %}
+{%         if neighbor_config.ttl_security.disable is vyos_defined%}
  neighbor {{ neighbors }} ttl-security disable
-{%                 else %}
- neighbor {{ neighbors }} ttl-security hops {{ ldp.neighbor[neighbors].ttl_security }}
-{%                 endif %}
-{%             endif %}
-{%             if ldp.neighbor[neighbors].session_holdtime is defined %}
- neighbor {{ neighbors }} session holdtime {{ ldp.neighbor[neighbors].session_holdtime }}
-{%             endif %}
-{%         endfor %}
-{%     endif %}
+{%         else %}
+ neighbor {{ neighbors }} ttl-security hops {{ neighbor_config.ttl_security }}
+{%         endif %}
+{%       endif %}
+{%       if neighbor_config.session_holdtime is vyos_defined %}
+ neighbor {{ neighbors }} session holdtime {{ neighbor_config.session_holdtime }}
+{%       endif %}
+{%     endfor %}
+{%   endif %}
  !
-{%     if ldp.discovery is defined %}
-{%         if ldp.discovery.transport_ipv4_address is defined %}
+{%   if ldp.discovery.transport_ipv4_address is vyos_defined %}
  address-family ipv4
-{%             if ldp.allocation is defined %}
-{%                 if ldp.allocation.ipv4 is defined %}
-{%                     if ldp.allocation.ipv4.access_list is defined %}
+{%     if ldp.allocation.ipv4.access_list is vyos_defined %}
   label local allocate for {{ ldp.allocation.ipv4.access_list }}
-{%                     endif %}
-{%                 endif %}
-{%             else %}
+{%     else %}
   label local allocate host-routes
-{%             endif %}
-{%             if ldp.discovery.transport_ipv4_address is defined %}
+{%     endif %}
+{%     if ldp.discovery.transport_ipv4_address is vyos_defined %}
   discovery transport-address {{ ldp.discovery.transport_ipv4_address }}
-{%             endif %}
-{%             if ldp.discovery.hello_ipv4_holdtime is defined %}
+{%     endif %}
+{%     if ldp.discovery.hello_ipv4_holdtime is vyos_defined %}
   discovery hello holdtime {{ ldp.discovery.hello_ipv4_holdtime }}
-{%             endif %}
-{%             if ldp.discovery.hello_ipv4_interval is defined %}
+{%     endif %}
+{%     if ldp.discovery.hello_ipv4_interval is vyos_defined %}
   discovery hello interval {{ ldp.discovery.hello_ipv4_interval }}
-{%             endif %}
-{%             if ldp.discovery.session_ipv4_holdtime is defined %}
+{%     endif %}
+{%     if ldp.discovery.session_ipv4_holdtime is vyos_defined %}
   session holdtime {{ ldp.discovery.session_ipv4_holdtime }}
-{%             endif %}
-{%             if ldp.import is defined %}
-{%                 if ldp.import.ipv4 is defined %}
-{%                     if ldp.import.ipv4.import_filter is defined %}
-{%                         if ldp.import.ipv4.import_filter.filter_access_list is defined %}
-{%                             if ldp.import.ipv4.import_filter.neighbor_access_list is defined %}
+{%     endif %}
+{%     if ldp.import.ipv4.import_filter.filter_access_list is vyos_defined %}
+{%       if ldp.import.ipv4.import_filter.neighbor_access_list is vyos_defined %}
   label remote accept for {{ ldp.import.ipv4.import_filter.filter_access_list }} from {{ ldp.import.ipv4.import_filter.neighbor_access_list }}
-{%                             else %}
+{%       else %}
   label remote accept for {{ ldp.import.ipv4.import_filter.filter_access_list }}
-{%                             endif %}
-{%                         endif %}
-{%                     endif %}
-{%                 endif %}
-{%             endif %}
-{%             if ldp.export is defined %}
-{%                 if ldp.export.ipv4 is defined %}
-{%                     if ldp.export.ipv4.explicit_null is defined %}
+{%       endif %}
+{%     endif %}
+{%     if ldp.export.ipv4.explicit_null is vyos_defined %}
   label local advertise explicit-null
-{%                     endif %}
-{%                     if ldp.export.ipv4.export_filter is defined %}
-{%                         if ldp.export.ipv4.export_filter.filter_access_list is defined %}
-{%                             if ldp.export.ipv4.export_filter.neighbor_access_list is defined %}
+{%     endif %}
+{%     if ldp.export.ipv4.export_filter.filter_access_list is vyos_defined %}
+{%       if ldp.export.ipv4.export_filter.neighbor_access_list is vyos_defined %}
   label local advertise for {{ ldp.export.ipv4.export_filter.filter_access_list }} to {{ ldp.export.ipv4.export_filter.neighbor_access_list }}
-{%                             else %}
+{%       else %}
   label local advertise for {{ ldp.export.ipv4.export_filter.filter_access_list }}
-{%                             endif %}
-{%                         endif %}
-{%                     endif %}
-{%                 endif %}
-{%             endif %}
-{%             if ldp.targeted_neighbor is defined %}
-{%                 if ldp.targeted_neighbor.ipv4.enable is defined %}
+{%       endif %}
+{%     endif %}
+{%     if ldp.targeted_neighbor is vyos_defined %}
+{%       if ldp.targeted_neighbor.ipv4.enable is vyos_defined %}
   discovery targeted-hello accept
-{%                 endif %}
-{%                 if ldp.targeted_neighbor.ipv4.hello_holdtime is defined %}
+{%       endif %}
+{%       if ldp.targeted_neighbor.ipv4.hello_holdtime is vyos_defined %}
   discovery targeted-hello holdtime {{ ldp.targeted_neighbor.ipv4.hello_holdtime }}
-{%                 endif %}
-{%                 if ldp.targeted_neighbor.ipv4.hello_interval is defined %}
+{%       endif %}
+{%       if ldp.targeted_neighbor.ipv4.hello_interval is vyos_defined %}
   discovery targeted-hello interval {{ ldp.targeted_neighbor.ipv4.hello_interval }}
-{%                 endif %}
-{%                 for addresses in ldp.targeted_neighbor.ipv4.address %}
-  neighbor {{addresses}} targeted
-{%                 endfor %}
-{%             endif %}
-{%             for interfaces in ldp.interface %}
-  interface {{interfaces}}
-{%             endfor %}
+{%       endif %}
+{%       for addresses in ldp.targeted_neighbor.ipv4.address %}
+  neighbor {{ addresses }} targeted
+{%       endfor %}
+{%     endif %}
+{%     if ldp.interface is vyos_defined %}
+{%       for interface in ldp.interface %}
+  interface {{ interface }}
+  exit
+{%       endfor %}
+{%     endif %}
  exit-address-family
-{%         else %}
+{%   else %}
  no address-family ipv4
-{%         endif %}
-{%     endif %}
+{%   endif %}
  !
-{%     if ldp.discovery is defined %}
-{%         if ldp.discovery.transport_ipv6_address is defined %}
+{%   if ldp.discovery.transport_ipv6_address is vyos_defined %}
  address-family ipv6
-{%             if ldp.allocation is defined %}
-{%                 if ldp.allocation.ipv6 is defined %}
-{%                     if ldp.allocation.ipv6.access_list6 is defined %}
+{%     if ldp.allocation.ipv6.access_list6 is vyos_defined %}
   label local allocate for {{ ldp.allocation.ipv6.access_list6 }}
-{%                     endif %}
-{%                 endif %}
-{%             else %}
+{%     else %}
   label local allocate host-routes
-{%             endif %}
-{%             if ldp.discovery.transport_ipv6_address is defined %}
+{%     endif %}
+{%     if ldp.discovery.transport_ipv6_address is vyos_defined %}
   discovery transport-address {{ ldp.discovery.transport_ipv6_address }}
-{%             endif %}
-{%             if ldp.discovery.hello_ipv6_holdtime is defined %}
+{%     endif %}
+{%     if ldp.discovery.hello_ipv6_holdtime is vyos_defined %}
   discovery hello holdtime {{ ldp.discovery.hello_ipv6_holdtime }}
-{%             endif %}
-{%             if ldp.discovery.hello_ipv6_interval is defined %}
+{%     endif %}
+{%     if ldp.discovery.hello_ipv6_interval is vyos_defined %}
   discovery hello interval {{ ldp.discovery.hello_ipv6_interval }}
-{%             endif %}
-{%             if ldp.discovery.session_ipv6_holdtime is defined %}
+{%     endif %}
+{%     if ldp.discovery.session_ipv6_holdtime is vyos_defined %}
   session holdtime {{ ldp.discovery.session_ipv6_holdtime }}
-{%             endif %}
-{%             if ldp.import is defined %}
-{%                 if ldp.import.ipv6 is defined %}
-{%                     if ldp.import.ipv6.import_filter is defined %}
-{%                         if ldp.import.ipv6.import_filter.filter_access_list6 is defined %}
-{%                             if ldp.import.ipv6.import_filter.neighbor_access_list6 is defined %}
+{%     endif %}
+{%     if ldp.import.ipv6.import_filter.filter_access_list6 is vyos_defined %}
+{%       if ldp.import.ipv6.import_filter.neighbor_access_list6 is vyos_defined %}
   label remote accept for {{ ldp.import.ipv6.import_filter.filter_access_list6 }} from {{ ldp.import.ipv6.import_filter.neighbor_access_list6 }}
-{%                             else %}
+{%       else %}
   label remote accept for {{ ldp.import.ipv6.import_filter.filter_access_list6 }}
-{%                             endif %}
-{%                         endif %}
-{%                     endif %}
-{%                 endif %}
-{%             endif %}
-{%             if ldp.export is defined %}
-{%                 if ldp.export.ipv6 is defined %}
-{%                     if ldp.export.ipv6.explicit_null is defined %}
+{%       endif %}
+{%     endif %}
+{%     if ldp.export.ipv6.explicit_null is vyos_defined %}
   label local advertise explicit-null
-{%                     endif %}
-{%                     if ldp.export.ipv6.export_filter is defined %}
-{%                         if ldp.export.ipv6.export_filter.filter_access_list6 is defined %}
-{%                             if ldp.export.ipv6.export_filter.neighbor_access_list6 is defined %}
+{%     endif %}
+{%     if ldp.export.ipv6.export_filter.filter_access_list6 is vyos_defined %}
+{%       if ldp.export.ipv6.export_filter.neighbor_access_list6 is vyos_defined %}
   label local advertise for {{ ldp.export.ipv6.export_filter.filter_access_list6 }} to {{ ldp.export.ipv6.export_filter.neighbor_access_list6 }}
-{%                             else %}
+{%       else %}
   label local advertise for {{ ldp.export.ipv6.export_filter.filter_access_list6 }}
-{%                             endif %}
-{%                         endif %}
-{%                     endif %}
-{%                 endif %}
-{%             endif %}
-{%             if ldp.targeted_neighbor is defined %}
-{%                 if ldp.targeted_neighbor.ipv6.enable is defined %}
+{%       endif %}
+{%     endif %}
+{%     if ldp.targeted_neighbor is vyos_defined %}
+{%       if ldp.targeted_neighbor.ipv6.enable is vyos_defined %}
   discovery targeted-hello accept
-{%                 endif %}
-{%                 if ldp.targeted_neighbor.ipv6.hello_holdtime is defined %}
+{%       endif %}
+{%       if ldp.targeted_neighbor.ipv6.hello_holdtime is vyos_defined %}
   discovery targeted-hello holdtime {{ ldp.targeted_neighbor.ipv6.hello_holdtime }}
-{%                 endif %}
-{%                 if ldp.targeted_neighbor.ipv6.hello_interval is defined %}
+{%       endif %}
+{%       if ldp.targeted_neighbor.ipv6.hello_interval is vyos_defined %}
   discovery targeted-hello interval {{ ldp.targeted_neighbor.ipv6.hello_interval }}
-{%                 endif %}
-{%                 for addresses in ldp.targeted_neighbor.ipv6.address %}
-  neighbor {{addresses}} targeted
-{%                 endfor %}
-{%             endif %}
-{%             for interfaces in ldp.interface %}
-  interface {{interfaces}}
-{%             endfor %}
+{%       endif %}
+{%       for addresses in ldp.targeted_neighbor.ipv6.address %}
+  neighbor {{ addresses }} targeted
+{%       endfor %}
+{%     endif %}
+{%     if ldp.interface is vyos_defined %}
+{%       for interface in ldp.interface %}
+  interface {{ interface }}
+{%       endfor %}
+{%     endif %}
  exit-address-family
-{%         else %}
+{%   else %}
  no address-family ipv6
-{%         endif %}
+{%   endif %}
  !
-{%     endif %}
 exit
 {% endif %}
 !
diff --git a/data/templates/frr/ospf6d.frr.tmpl b/data/templates/frr/ospf6d.frr.tmpl
index a73c6cac3..325f05213 100644
--- a/data/templates/frr/ospf6d.frr.tmpl
+++ b/data/templates/frr/ospf6d.frr.tmpl
@@ -1,47 +1,47 @@
 !
-{% if interface is defined and interface is not none %}
+{% if interface is vyos_defined %}
 {%   for iface, iface_config in interface.items() %}
 interface {{ iface }}
-{%     if iface_config.area is defined and iface_config.area is not none %}
+{%     if iface_config.area is vyos_defined %}
  ipv6 ospf6 area {{ iface_config.area }}
 {%     endif %}
-{%     if iface_config.cost is defined and iface_config.cost is not none %}
+{%     if iface_config.cost is vyos_defined %}
  ipv6 ospf6 cost {{ iface_config.cost }}
 {%     endif %}
-{%     if iface_config.priority is defined and iface_config.priority is not none %}
+{%     if iface_config.priority is vyos_defined %}
  ipv6 ospf6 priority {{ iface_config.priority }}
 {%     endif %}
-{%     if iface_config.hello_interval is defined and iface_config.hello_interval is not none %}
+{%     if iface_config.hello_interval is vyos_defined %}
  ipv6 ospf6 hello-interval {{ iface_config.hello_interval }}
 {%     endif %}
-{%     if iface_config.retransmit_interval is defined and iface_config.retransmit_interval is not none %}
+{%     if iface_config.retransmit_interval is vyos_defined %}
  ipv6 ospf6 retransmit-interval {{ iface_config.retransmit_interval }}
 {%     endif %}
-{%     if iface_config.transmit_delay is defined and iface_config.transmit_delay is not none %}
+{%     if iface_config.transmit_delay is vyos_defined %}
  ipv6 ospf6 transmit-delay {{ iface_config.transmit_delay }}
 {%     endif %}
-{%     if iface_config.dead_interval is defined and iface_config.dead_interval is not none %}
+{%     if iface_config.dead_interval is vyos_defined %}
  ipv6 ospf6 dead-interval {{ iface_config.dead_interval }}
 {%     endif %}
-{%     if iface_config.bfd is defined %}
+{%     if iface_config.bfd is vyos_defined %}
  ipv6 ospf6 bfd
-{%       if iface_config.bfd.profile is defined and iface_config.bfd.profile is not none %}
+{%     endif %}
+{%     if iface_config.bfd.profile is vyos_defined %}
  ipv6 ospf6 bfd profile {{ iface_config.bfd.profile }}
-{%       endif %}
 {%     endif %}
-{%     if iface_config.mtu_ignore is defined %}
+{%     if iface_config.mtu_ignore is vyos_defined %}
  ipv6 ospf6 mtu-ignore
 {%     endif %}
-{%     if iface_config.ifmtu is defined and iface_config.ifmtu is not none %}
+{%     if iface_config.ifmtu is vyos_defined %}
  ipv6 ospf6 ifmtu {{ iface_config.ifmtu }}
 {%     endif %}
-{%     if iface_config.network is defined and iface_config.network is not none %}
+{%     if iface_config.network is vyos_defined %}
  ipv6 ospf6 network {{ iface_config.network }}
 {%     endif %}
-{%     if iface_config.instance_id is defined and iface_config.instance_id is not none %}
+{%     if iface_config.instance_id is vyos_defined %}
  ipv6 ospf6 instance-id {{ iface_config.instance_id }}
 {%     endif %}
-{%     if iface_config.passive is defined %}
+{%     if iface_config.passive is vyos_defined %}
  ipv6 ospf6 passive
 {%     endif %}
 exit
@@ -49,50 +49,46 @@ exit
 {%   endfor %}
 {% endif %}
 !
-router ospf6 {{ 'vrf ' + vrf if vrf is defined and vrf is not none }}
-{% if area is defined and area is not none %}
+router ospf6 {{ 'vrf ' ~ vrf if vrf is vyos_defined }}
+{% if area is vyos_defined %}
 {%   for area_id, area_config in area.items() %}
-{%     if area_config.area_type is defined and area_config.area_type is not none %}
+{%     if area_config.area_type is vyos_defined %}
 {%       for type, type_config in area_config.area_type.items() %}
- area {{ area_id }} {{ type }} {{ 'default-information-originate' if type_config.default_information_originate is defined }} {{ 'no-summary' if type_config.no_summary is defined }}
+ area {{ area_id }} {{ type }} {{ 'default-information-originate' if type_config.default_information_originate is vyos_defined }} {{ 'no-summary' if type_config.no_summary is vyos_defined }}
 {%       endfor %}
 {%     endif %}
-{%     if area_config.range is defined and area_config.range is not none %}
+{%     if area_config.range is vyos_defined %}
 {%       for prefix, prefix_config in area_config.range.items() %}
- area {{ area_id }} range {{ prefix }} {{ 'advertise' if prefix_config.advertise is defined }} {{ 'not-advertise' if prefix_config.not_advertise is defined }}
+ area {{ area_id }} range {{ prefix }} {{ 'advertise' if prefix_config.advertise is vyos_defined }} {{ 'not-advertise' if prefix_config.not_advertise is vyos_defined }}
 {%       endfor %}
 {%     endif %}
-{%     if area_config.export_list is defined and area_config.export_list is not none %}
+{%     if area_config.export_list is vyos_defined %}
  area {{ area_id }} export-list {{ area_config.export_list }}
 {%     endif %}
-{%     if area_config.import_list is defined and area_config.import_list is not none %}
+{%     if area_config.import_list is vyos_defined %}
  area {{ area_id }} import-list {{ area_config.import_list }}
 {%     endif %}
 {%   endfor %}
 {% endif %}
  auto-cost reference-bandwidth {{ auto_cost.reference_bandwidth }}
-{% if default_information is defined and default_information.originate is defined and default_information.originate is not none %}
- default-information originate {{ 'always' if default_information.originate.always is defined }} {{ 'metric ' + default_information.originate.metric if default_information.originate.metric is defined }} {{ 'metric-type ' + default_information.originate.metric_type if default_information.originate.metric_type is defined }} {{ 'route-map ' + default_information.originate.route_map if default_information.originate.route_map is defined }}
+{% if default_information.originate is vyos_defined %}
+ default-information originate {{ 'always' if default_information.originate.always is vyos_defined }} {{ 'metric ' + default_information.originate.metric if default_information.originate.metric is vyos_defined }} {{ 'metric-type ' + default_information.originate.metric_type if default_information.originate.metric_type is vyos_defined }} {{ 'route-map ' + default_information.originate.route_map if default_information.originate.route_map is vyos_defined }}
 {% endif %}
-{% if distance is defined and distance is not none %}
-{%   if distance.global is defined and distance.global is not none %}
+{% if distance.global is vyos_defined %}
  distance {{ distance.global }}
-{%   endif %}
-{%   if distance.ospfv3 is defined and distance.ospfv3 is not none %}
- distance ospf6 {{ 'intra-area ' + distance.ospfv3.intra_area if distance.ospfv3.intra_area is defined }} {{ 'inter-area ' + distance.ospfv3.inter_area if distance.ospfv3.inter_area is defined }} {{ 'external ' + distance.ospfv3.external if distance.ospfv3.external is defined }}
-{%   endif %}
 {% endif %}
-{% if log_adjacency_changes is defined %}
- log-adjacency-changes {{ "detail" if log_adjacency_changes.detail is defined }}
+{% if distance.ospfv3 is vyos_defined %}
+ distance ospf6 {{ 'intra-area ' + distance.ospfv3.intra_area if distance.ospfv3.intra_area is vyos_defined }} {{ 'inter-area ' + distance.ospfv3.inter_area if distance.ospfv3.inter_area is vyos_defined }} {{ 'external ' + distance.ospfv3.external if distance.ospfv3.external is vyos_defined }}
+{% endif %}
+{% if log_adjacency_changes is vyos_defined %}
+ log-adjacency-changes {{ "detail" if log_adjacency_changes.detail is vyos_defined }}
 {% endif %}
-{% if parameters is defined and parameters is not none %}
-{%   if parameters.router_id is defined and parameters.router_id is not none %}
+{% if parameters.router_id is vyos_defined %}
  ospf6 router-id {{ parameters.router_id }}
-{%   endif %}
 {% endif %}
-{% if redistribute is defined and redistribute is not none %}
+{% if redistribute is vyos_defined %}
 {%   for protocol, options in redistribute.items() %}
- redistribute {{ protocol }} {{ 'route-map ' + options.route_map if options.route_map is defined }}
+ redistribute {{ protocol }} {{ 'route-map ' + options.route_map if options.route_map is vyos_defined }}
 {%   endfor %}
 {% endif %}
 exit
diff --git a/data/templates/frr/ospfd.frr.tmpl b/data/templates/frr/ospfd.frr.tmpl
index 59d936b55..7c6738181 100644
--- a/data/templates/frr/ospfd.frr.tmpl
+++ b/data/templates/frr/ospfd.frr.tmpl
@@ -1,121 +1,117 @@
 !
-{% if interface is defined and interface is not none %}
+{% if interface is vyos_defined %}
 {%   for iface, iface_config in interface.items() %}
 interface {{ iface }}
-{%     if iface_config.authentication is defined and iface_config.authentication is not none %}
-{%       if iface_config.authentication.plaintext_password is defined and iface_config.authentication.plaintext_password is not none %}
+{%     if iface_config.authentication.plaintext_password is vyos_defined %}
  ip ospf authentication-key {{ iface_config.authentication.plaintext_password }}
-{%       elif iface_config.authentication.md5 is defined %}
+{%     elif iface_config.authentication.md5 is vyos_defined %}
  ip ospf authentication message-digest
-{%         if iface_config.authentication.md5.key_id is defined and iface_config.authentication.md5.key_id is not none %}
-{%           for key, key_config in iface_config.authentication.md5.key_id.items() %}
+{%       if iface_config.authentication.md5.key_id is vyos_defined %}
+{%         for key, key_config in iface_config.authentication.md5.key_id.items() %}
  ip ospf message-digest-key {{ key }} md5 {{ key_config.md5_key }}
-{%           endfor %}
-{%         endif %}
+{%         endfor %}
 {%       endif %}
 {%     endif %}
-{%     if iface_config.area is defined and iface_config.area is not none %}
+{%     if iface_config.area is vyos_defined %}
  ip ospf area {{ iface_config.area }}
 {%     endif %}
-{%     if iface_config.bandwidth is defined and iface_config.bandwidth is not none %}
+{%     if iface_config.bandwidth is vyos_defined %}
  bandwidth {{ iface_config.bandwidth }}
 {%     endif %}
-{%     if iface_config.cost is defined and iface_config.cost is not none %}
+{%     if iface_config.cost is vyos_defined %}
  ip ospf cost {{ iface_config.cost }}
 {%     endif %}
-{%     if iface_config.priority is defined and iface_config.priority is not none %}
+{%     if iface_config.priority is vyos_defined %}
  ip ospf priority {{ iface_config.priority }}
 {%     endif %}
-{%     if iface_config.hello_interval is defined and iface_config.hello_interval is not none %}
+{%     if iface_config.hello_interval is vyos_defined %}
  ip ospf hello-interval {{ iface_config.hello_interval }}
 {%     endif %}
-{%     if iface_config.retransmit_interval is defined and iface_config.retransmit_interval is not none %}
+{%     if iface_config.retransmit_interval is vyos_defined %}
  ip ospf retransmit-interval {{ iface_config.retransmit_interval }}
 {%     endif %}
-{%     if iface_config.transmit_delay is defined and iface_config.transmit_delay is not none %}
+{%     if iface_config.transmit_delay is vyos_defined %}
  ip ospf transmit-delay {{ iface_config.transmit_delay }}
 {%     endif %}
-{%     if iface_config.dead_interval is defined and iface_config.dead_interval is not none %}
+{%     if iface_config.dead_interval is vyos_defined %}
  ip ospf dead-interval {{ iface_config.dead_interval }}
-{%     elif iface_config.hello_multiplier is defined and iface_config.hello_multiplier is not none %}
+{%     elif iface_config.hello_multiplier is vyos_defined %}
  ip ospf dead-interval minimal hello-multiplier {{ iface_config.hello_multiplier }}
 {%     endif %}
-{%     if iface_config.bfd is defined %}
+{%     if iface_config.bfd is vyos_defined %}
  ip ospf bfd
-{%       if iface_config.bfd.profile is defined and iface_config.bfd.profile is not none %}
+{%     endif %}
+{%     if iface_config.bfd.profile is vyos_defined %}
  ip ospf bfd profile {{ iface_config.bfd.profile }}
-{%       endif %}
 {%     endif %}
-{%     if iface_config.mtu_ignore is defined %}
+{%     if iface_config.mtu_ignore is vyos_defined %}
  ip ospf mtu-ignore
 {%     endif %}
-{%     if iface_config.network is defined and iface_config.network is not none %}
+{%     if iface_config.network is vyos_defined %}
  ip ospf network {{ iface_config.network }}
 {%     endif %}
-{%     if iface_config.passive is defined %}
- {{ 'no ' if iface_config.passive.disable is defined }}ip ospf passive
+{%     if iface_config.passive is vyos_defined %}
+ {{ 'no ' if iface_config.passive.disable is vyos_defined }}ip ospf passive
 {%     endif %}
 exit
 !
 {%   endfor %}
 {% endif %}
 !
-router ospf {{ 'vrf ' + vrf if vrf is defined and vrf is not none }}
-{% if access_list is defined and access_list is not none %}
+router ospf {{ 'vrf ' ~ vrf if vrf is vyos_defined }}
+{% if access_list is vyos_defined %}
 {%   for acl, acl_config in access_list.items() %}
-{%     for protocol in acl_config.export if acl_config.export is defined %}
+{%     for protocol in acl_config.export if acl_config.export is vyos_defined %}
  distribute-list {{ acl }} out {{ protocol }}
 {%     endfor %}
 {%   endfor %}
 {% endif %}
-{% if area is defined and area is not none %}
+{% if area is vyos_defined %}
 {%   for area_id, area_config in area.items() %}
-{%     if area_config.area_type is defined and area_config.area_type is not none %}
+{%     if area_config.area_type is vyos_defined %}
 {%       for type, type_config in area_config.area_type.items() if type != 'normal' %}
- area {{ area_id }} {{ type }} {{ 'no-summary' if type_config.no_summary is defined }}
-{%         if type_config.default_cost is defined and type_config.default_cost is not none %}
+ area {{ area_id }} {{ type }} {{ 'no-summary' if type_config.no_summary is vyos_defined }}
+{%         if type_config.default_cost is vyos_defined %}
  area {{ area_id }} default-cost {{ type_config.default_cost }}
 {%         endif %}
 {%       endfor %}
 {%     endif %}
-{%     if area_config.authentication is defined and area_config.authentication is not none %}
- area {{ area_id }} authentication {{ 'message-digest' if area_config.authentication == 'md5' }}
+{%     if area_config.authentication is vyos_defined %}
+ area {{ area_id }} authentication {{ 'message-digest' if area_config.authentication is vyos_defined('md5') }}
 {%     endif %}
-{%     for network in area_config.network if area_config.network is defined %}
+{%     for network in area_config.network if area_config.network is vyos_defined %}
  network {{ network }} area {{ area_id }}
 {%     endfor %}
-{%     if area_config.range is defined and area_config.range is not none %}
+{%     if area_config.range is vyos_defined %}
 {%       for range, range_config in area_config.range.items() %}
-{%         if range_config.cost is defined and range_config.cost is not none %}
+{%         if range_config.cost is vyos_defined %}
  area {{ area_id }} range {{ range }} cost {{ range_config.cost }}
 {%         endif %}
-{%         if range_config.not_advertise is defined %}
+{%         if range_config.not_advertise is vyos_defined %}
  area {{ area_id }} range {{ range }} not-advertise
 {%         endif %}
-{%         if range_config.substitute is defined and range_config.substitute is not none %}
+{%         if range_config.substitute is vyos_defined %}
  area {{ area_id }} range {{ range }} substitute {{ range_config.substitute }}
 {%         endif %}
 {%       endfor %}
 {%     endif %}
-{%     if area_config.export_list is defined and area_config.export_list is not none %}
+{%     if area_config.export_list is vyos_defined %}
  area {{ area_id }} export-list {{ area_config.export_list }}
 {%     endif %}
-{%     if area_config.import_list is defined and area_config.import_list is not none %}
+{%     if area_config.import_list is vyos_defined %}
  area {{ area_id }} import-list {{ area_config.import_list }}
 {%     endif %}
-{%     if area_config.shortcut is defined and area_config.shortcut is not none %}
+{%     if area_config.shortcut is vyos_defined %}
  area {{ area_id }} shortcut {{ area_config.shortcut }}
 {%     endif %}
-{%     if area_config.virtual_link is defined and area_config.virtual_link is not none %}
+{%     if area_config.virtual_link is vyos_defined %}
 {%       for link, link_config in area_config.virtual_link.items() %}
-{%         if link_config.authentication is defined and link_config.authentication is not none %}
-{%           if link_config.authentication.plaintext_password is defined and link_config.authentication.plaintext_password is not none %}
+{%         if link_config.authentication.plaintext_password is vyos_defined %}
  area {{ area_id }} virtual-link {{ link }} authentication-key {{ link_config.authentication.plaintext_password }}
-{%           elif link_config.authentication.md5 is defined and link_config.authentication.md5.key_id is defined and link_config.authentication.md5.key_id is not none %}
-{%             for key, key_config in link_config.authentication.md5.key_id.items() %}
+{%         elif link_config.authentication.md5.key_id is vyos_defined %}
+{%           for key, key_config in link_config.authentication.md5.key_id.items() %}
  area {{ area_id }} virtual-link {{ link }} message-digest-key {{ key }} md5 {{ key_config.md5_key }}
-{%             endfor %}
-{%           endif %}
+{%           endfor %}
 {%         endif %}
 {#         The following values are default values #}
  area {{ area_id }} virtual-link {{ link }} hello-interval {{ link_config.hello_interval }} retransmit-interval {{ link_config.retransmit_interval }} transmit-delay {{ link_config.transmit_delay }} dead-interval {{ link_config.dead_interval }}
@@ -123,75 +119,69 @@ router ospf {{ 'vrf ' + vrf if vrf is defined and vrf is not none }}
 {%     endif %}
 {%   endfor %}
 {% endif %}
-{% if auto_cost is defined and auto_cost.reference_bandwidth is defined and auto_cost.reference_bandwidth is not none %}
+{% if auto_cost.reference_bandwidth is vyos_defined %}
  auto-cost reference-bandwidth {{ auto_cost.reference_bandwidth }}
 {% endif %}
-{% if default_information is defined and default_information.originate is defined and default_information.originate is not none %}
- default-information originate {{ 'always' if default_information.originate.always is defined }} {{ 'metric ' + default_information.originate.metric if default_information.originate.metric is defined }} {{ 'metric-type ' + default_information.originate.metric_type if default_information.originate.metric_type is defined }} {{ 'route-map ' + default_information.originate.route_map if default_information.originate.route_map is defined }}
+{% if default_information.originate is vyos_defined %}
+ default-information originate {{ 'always' if default_information.originate.always is vyos_defined }} {{ 'metric ' + default_information.originate.metric if default_information.originate.metric is vyos_defined }} {{ 'metric-type ' + default_information.originate.metric_type if default_information.originate.metric_type is vyos_defined }} {{ 'route-map ' + default_information.originate.route_map if default_information.originate.route_map is vyos_defined }}
 {% endif %}
-{% if default_metric is defined and default_metric is not none %}
+{% if default_metric is vyos_defined %}
  default-metric {{ default_metric }}
 {% endif %}
-{% if maximum_paths is defined and maximum_paths is not none %}
+{% if maximum_paths is vyos_defined %}
  maximum-paths {{ maximum_paths }}
 {% endif %}
-{% if distance is defined and distance is not none %}
-{%   if distance.global is defined and distance.global is not none %}
+{% if distance.global is vyos_defined %}
  distance {{ distance.global }}
-{%   endif %}
-{%   if distance.ospf is defined and distance.ospf is not none %}
- distance ospf {{ 'intra-area ' + distance.ospf.intra_area if distance.ospf.intra_area is defined }} {{ 'inter-area ' + distance.ospf.inter_area if distance.ospf.inter_area is defined }} {{ 'external ' + distance.ospf.external if distance.ospf.external is defined }}
-{%   endif %}
 {% endif %}
-{% if log_adjacency_changes is defined %}
- log-adjacency-changes {{ "detail" if log_adjacency_changes.detail is defined }}
+{% if distance.ospf is vyos_defined %}
+ distance ospf {{ 'intra-area ' + distance.ospf.intra_area if distance.ospf.intra_area is vyos_defined }} {{ 'inter-area ' + distance.ospf.inter_area if distance.ospf.inter_area is vyos_defined }} {{ 'external ' + distance.ospf.external if distance.ospf.external is vyos_defined }}
 {% endif %}
-{% if max_metric is defined and max_metric.router_lsa is defined and max_metric.router_lsa is not none %}
-{%   if max_metric.router_lsa.administrative is defined %}
+{% if log_adjacency_changes is vyos_defined %}
+ log-adjacency-changes {{ "detail" if log_adjacency_changes.detail is vyos_defined }}
+{% endif %}
+{% if max_metric.router_lsa.administrative is vyos_defined %}
  max-metric router-lsa administrative
-{%   endif %}
-{%   if max_metric.router_lsa.on_shutdown is defined and max_metric.router_lsa.on_shutdown is not none %}
+{% endif %}
+{% if max_metric.router_lsa.on_shutdown is vyos_defined %}
  max-metric router-lsa on-shutdown {{ max_metric.router_lsa.on_shutdown }}
-{%   endif %}
-{%   if max_metric.router_lsa.on_startup is defined and max_metric.router_lsa.on_startup is not none %}
+{% endif %}
+{% if max_metric.router_lsa.on_startup is vyos_defined %}
  max-metric router-lsa on-startup {{ max_metric.router_lsa.on_startup }}
-{%   endif %}
 {% endif %}
-{% if mpls_te is defined and mpls_te.enable is defined %}
+{% if mpls_te.enable is vyos_defined %}
  mpls-te on
  mpls-te router-address {{ mpls_te.router_address }}
 {% endif %}
-{% if neighbor is defined and neighbor is not none%}
+{% if neighbor is vyos_defined %}
 {%   for address, address_config in neighbor.items() %}
- neighbor {{ address }} {{ 'priority ' + address_config.priority if address_config.priority is defined }} {{ 'poll-interval ' + address_config.poll_interval if address_config.poll_interval is defined }}
+ neighbor {{ address }} {{ 'priority ' + address_config.priority if address_config.priority is vyos_defined }} {{ 'poll-interval ' + address_config.poll_interval if address_config.poll_interval is vyos_defined }}
 {%   endfor %}
 {% endif %}
-{% if parameters is defined and parameters is not none %}
-{%   if parameters.abr_type is defined and parameters.abr_type is not none %}
+{% if parameters.abr_type is vyos_defined %}
  ospf abr-type {{ parameters.abr_type }}
-{%   endif %}
-{%   if parameters.router_id is defined and parameters.router_id is not none %}
+{% endif %}
+{% if parameters.router_id is vyos_defined %}
  ospf router-id {{ parameters.router_id }}
-{%   endif %}
 {% endif %}
-{% if passive_interface is defined and passive_interface.default is defined %}
+{% if passive_interface.default is vyos_defined %}
  passive-interface default
 {% endif %}
-{% if redistribute is defined and redistribute is not none %}
+{% if redistribute is vyos_defined %}
 {%   for protocol, protocols_options in redistribute.items() %}
 {%     if protocol == 'table' %}
 {%       for table, table_options in protocols_options.items() %}
- redistribute {{ protocol }} {{ table }} {{ 'metric ' + table_options.metric if table_options.metric is defined }} {{ 'metric-type ' + table_options.metric_type if table_options.metric_type is defined }} {{ 'route-map ' + table_options.route_map if table_options.route_map is defined }}
+ redistribute {{ protocol }} {{ table }} {{ 'metric ' + table_options.metric if table_options.metric is vyos_defined }} {{ 'metric-type ' + table_options.metric_type if table_options.metric_type is vyos_defined }} {{ 'route-map ' + table_options.route_map if table_options.route_map is vyos_defined }}
 {%       endfor %}
 {%     else %}
- redistribute {{ protocol }} {{ 'metric ' + protocols_options.metric if protocols_options.metric is defined }} {{ 'metric-type ' + protocols_options.metric_type if protocols_options.metric_type is defined }} {{ 'route-map ' + protocols_options.route_map if protocols_options.route_map is defined }}
+ redistribute {{ protocol }} {{ 'metric ' + protocols_options.metric if protocols_options.metric is vyos_defined }} {{ 'metric-type ' + protocols_options.metric_type if protocols_options.metric_type is vyos_defined }} {{ 'route-map ' + protocols_options.route_map if protocols_options.route_map is vyos_defined }}
 {%     endif %}
 {%   endfor %}
 {% endif %}
-{% if refresh is defined and refresh.timers is defined and refresh.timers is not none %}
+{% if refresh.timers is vyos_defined %}
  refresh timer {{ refresh.timers }}
 {% endif %}
-{% if timers is defined and timers.throttle is defined and timers.throttle.spf is defined and timers.throttle.spf is not none %}
+{% if timers.throttle.spf.delay is vyos_defined and timers.throttle.spf.initial_holdtime is vyos_defined and timers.throttle.spf.max_holdtime is vyos_defined %}
 {#   Timer values have default values #}
  timers throttle spf {{ timers.throttle.spf.delay }} {{ timers.throttle.spf.initial_holdtime }} {{ timers.throttle.spf.max_holdtime }}
 {% endif %}
diff --git a/data/templates/frr/policy.frr.tmpl b/data/templates/frr/policy.frr.tmpl
index 60e15f4fd..814dbf761 100644
--- a/data/templates/frr/policy.frr.tmpl
+++ b/data/templates/frr/policy.frr.tmpl
@@ -1,18 +1,18 @@
-{% if access_list is defined and access_list is not none %}
+{% if access_list is vyos_defined %}
 {%   for acl, acl_config in access_list.items() | natural_sort %}
-{%     if acl_config.description is defined and acl_config.description is not none %}
+{%     if acl_config.description is vyos_defined %}
 access-list {{ acl }} remark {{ acl_config.description }}
 {%     endif %}
-{%     if acl_config.rule is defined and acl_config.rule is not none %}
+{%     if acl_config.rule is vyos_defined %}
 {%       for rule, rule_config in acl_config.rule.items() | natural_sort %}
 {%         set ip = '' %}
 {%         set src = '' %}
 {%         set src_mask = '' %}
-{%         if rule_config.source is defined and rule_config.source.any is defined %}
+{%         if rule_config.source.any is vyos_defined %}
 {%           set src = 'any' %}
-{%         elif rule_config.source is defined and rule_config.source.host is defined and rule_config.source.host is not none %}
-{%           set src = 'host ' + rule_config.source.host %}
-{%         elif rule_config.source is defined and rule_config.source.network is defined and rule_config.source.network is not none %}
+{%         elif rule_config.source.host is vyos_defined %}
+{%           set src = 'host ' ~ rule_config.source.host %}
+{%         elif rule_config.source.network is vyos_defined %}
 {%           set src = rule_config.source.network %}
 {%           set src_mask = rule_config.source.inverse_mask %}
 {%         endif %}
@@ -21,11 +21,11 @@ access-list {{ acl }} remark {{ acl_config.description }}
 {%         if (acl|int >= 100 and acl|int <= 199) or (acl|int >= 2000 and acl|int <= 2699) %}
 {%           set ip = 'ip' %}
 {%           set dst = 'any' %}
-{%           if rule_config.destination is defined and rule_config.destination.any is defined %}
+{%           if rule_config.destination.any is vyos_defined %}
 {%             set dst = 'any' %}
-{%           elif rule_config.destination is defined and rule_config.destination.host is defined and rule_config.destination.host is not none %}
-{%             set dst = 'host ' + rule_config.destination.host %}
-{%           elif rule_config.destination is defined and rule_config.destination.network is defined and rule_config.destination.network is not none %}
+{%           elif rule_config.destination.host is vyos_defined %}
+{%             set dst = 'host ' ~ rule_config.destination.host %}
+{%           elif rule_config.destination.network is vyos_defined %}
 {%             set dst = rule_config.destination.network %}
 {%             set dst_mask = rule_config.destination.inverse_mask %}
 {%           endif %}
@@ -36,28 +36,28 @@ access-list {{ acl }} seq {{ rule }} {{ rule_config.action }} {{ ip }} {{ src }}
 {%   endfor %}
 {% endif %}
 !
-{% if access_list6 is defined and access_list6 is not none %}
+{% if access_list6 is vyos_defined %}
 {%   for acl, acl_config in access_list6.items() | natural_sort %}
-{%     if acl_config.description is defined and acl_config.description is not none %}
+{%     if acl_config.description is vyos_defined %}
 ipv6 access-list {{ acl }} remark {{ acl_config.description }}
 {%     endif %}
-{%     if acl_config.rule is defined and acl_config.rule is not none %}
+{%     if acl_config.rule is vyos_defined %}
 {%       for rule, rule_config in acl_config.rule.items() | natural_sort %}
 {%         set src = '' %}
-{%         if rule_config.source is defined and rule_config.source.any is defined %}
+{%         if rule_config.source.any is vyos_defined %}
 {%           set src = 'any' %}
-{%         elif rule_config.source is defined and rule_config.source.network is defined and rule_config.source.network is not none %}
+{%         elif rule_config.source.network is vyos_defined %}
 {%           set src = rule_config.source.network %}
 {%         endif %}
-ipv6 access-list {{ acl }} seq {{ rule }} {{ rule_config.action }} {{ src }} {{ 'exact-match' if rule_config.source.exact_match is defined }}
+ipv6 access-list {{ acl }} seq {{ rule }} {{ rule_config.action }} {{ src }} {{ 'exact-match' if rule_config.source.exact_match is vyos_defined }}
 {%       endfor %}
 {%     endif %}
 {%   endfor %}
 {% endif %}
 !
-{% if as_path_list is defined and as_path_list is not none %}
+{% if as_path_list is vyos_defined %}
 {%   for acl, acl_config in as_path_list.items() | natural_sort %}
-{%     if acl_config.rule is defined and acl_config.rule is not none %}
+{%     if acl_config.rule is vyos_defined %}
 {%       for rule, rule_config in acl_config.rule.items() | natural_sort %}
 bgp as-path access-list {{ acl }} seq {{ rule }} {{ rule_config.action }} {{ rule_config.regex }}
 {%       endfor %}
@@ -65,9 +65,9 @@ bgp as-path access-list {{ acl }} seq {{ rule }} {{ rule_config.action }} {{ rul
 {%   endfor %}
 {% endif %}
 !
-{% if community_list is defined and community_list is not none %}
+{% if community_list is vyos_defined %}
 {%   for list, list_config in community_list.items() | natural_sort %}
-{%     if list_config.rule is defined and list_config.rule is not none %}
+{%     if list_config.rule is vyos_defined %}
 {%       for rule, rule_config in list_config.rule.items() | natural_sort %}
 {#         by default, if casting to int fails it returns 0 #}
 {%         if list|int != 0 %}
@@ -80,9 +80,9 @@ bgp community-list expanded {{ list }} seq {{ rule }} {{ rule_config.action }} {
 {%   endfor %}
 {% endif %}
 !
-{% if extcommunity_list is defined and extcommunity_list is not none %}
+{% if extcommunity_list is vyos_defined %}
 {%   for list, list_config in extcommunity_list.items() | natural_sort %}
-{%     if list_config.rule is defined and list_config.rule is not none %}
+{%     if list_config.rule is vyos_defined %}
 {%       for rule, rule_config in list_config.rule.items() | natural_sort %}
 {#         by default, if casting to int fails it returns 0 #}
 {%         if list|int != 0 %}
@@ -95,9 +95,9 @@ bgp extcommunity-list expanded {{ list }} seq {{ rule }} {{ rule_config.action }
 {%   endfor %}
 {% endif %}
 !
-{% if large_community_list is defined and large_community_list is not none %}
+{% if large_community_list is vyos_defined %}
 {%   for list, list_config in large_community_list.items() | natural_sort %}
-{%     if list_config.rule is defined and list_config.rule is not none %}
+{%     if list_config.rule is vyos_defined %}
 {%       for rule, rule_config in list_config.rule.items() | natural_sort %}
 {#         by default, if casting to int fails it returns 0 #}
 {%         if list|int != 0 %}
@@ -110,209 +110,207 @@ bgp large-community-list expanded {{ list }} seq {{ rule }} {{ rule_config.actio
 {%   endfor %}
 {% endif %}
 !
-{% if prefix_list is defined and prefix_list is not none %}
+{% if prefix_list is vyos_defined %}
 {%   for prefix_list, prefix_list_config in prefix_list.items() | natural_sort %}
-{%     if prefix_list_config.description is defined and prefix_list_config.description is not none %}
+{%     if prefix_list_config.description is vyos_defined %}
 ip prefix-list {{ prefix_list }} description {{ prefix_list_config.description }}
 {%     endif %}
-{%     if prefix_list_config.rule is defined and prefix_list_config.rule is not none %}
+{%     if prefix_list_config.rule is vyos_defined %}
 {%       for rule, rule_config in prefix_list_config.rule.items() | natural_sort %}
-{%         if rule_config.prefix is defined and rule_config.prefix is not none %}
-ip prefix-list {{ prefix_list }} seq {{ rule }} {{ rule_config.action }} {{ rule_config.prefix }} {{ 'ge ' + rule_config.ge if rule_config.ge is defined }} {{ 'le ' + rule_config.le if rule_config.le is defined }}
+{%         if rule_config.prefix is vyos_defined %}
+ip prefix-list {{ prefix_list }} seq {{ rule }} {{ rule_config.action }} {{ rule_config.prefix }} {{ 'ge ' ~ rule_config.ge if rule_config.ge is vyos_defined }} {{ 'le ' ~ rule_config.le if rule_config.le is vyos_defined }}
 {%         endif %}
 {%       endfor %}
 {%     endif %}
 {%   endfor %}
 {% endif %}
 !
-{% if prefix_list6 is defined and prefix_list6 is not none %}
+{% if prefix_list6 is vyos_defined %}
 {%   for prefix_list, prefix_list_config in prefix_list6.items() | natural_sort %}
-{%     if prefix_list_config.description is defined and prefix_list_config.description is not none %}
+{%     if prefix_list_config.description is vyos_defined %}
 ipv6 prefix-list {{ prefix_list }} description {{ prefix_list_config.description }}
 {%     endif %}
-{%     if prefix_list_config.rule is defined and prefix_list_config.rule is not none %}
+{%     if prefix_list_config.rule is vyos_defined %}
 {%       for rule, rule_config in prefix_list_config.rule.items() | natural_sort %}
-{%         if rule_config.prefix is defined and rule_config.prefix is not none %}
-ipv6 prefix-list {{ prefix_list }} seq {{ rule }} {{ rule_config.action }} {{ rule_config.prefix }} {{ 'ge ' + rule_config.ge if rule_config.ge is defined }} {{ 'le ' + rule_config.le if rule_config.le is defined }}
+{%         if rule_config.prefix is vyos_defined %}
+ipv6 prefix-list {{ prefix_list }} seq {{ rule }} {{ rule_config.action }} {{ rule_config.prefix }} {{ 'ge ' ~ rule_config.ge if rule_config.ge is vyos_defined }} {{ 'le ' ~ rule_config.le if rule_config.le is vyos_defined }}
 {%         endif %}
 {%       endfor %}
 {%     endif %}
 {%   endfor %}
 {% endif %}
 !
-{% if route_map is defined and route_map is not none %}
+{% if route_map is vyos_defined %}
 {%   for route_map, route_map_config in route_map.items() | natural_sort %}
-{%     if route_map_config.rule is defined and route_map_config.rule is not none %}
+{%     if route_map_config.rule is vyos_defined %}
 {%       for rule, rule_config in route_map_config.rule.items() | natural_sort %}
 route-map {{ route_map }} {{ rule_config.action }} {{ rule }}
-{%         if rule_config.call is defined and rule_config.call is not none %}
+{%         if rule_config.call is vyos_defined %}
  call {{ rule_config.call }}
 {%         endif %}
-{%         if rule_config.continue is defined and rule_config.continue is not none %}
+{%         if rule_config.continue is vyos_defined %}
  on-match goto {{ rule_config.continue }}
 {%         endif %}
-{%         if rule_config.description is defined and rule_config.description is not none %}
+{%         if rule_config.description is vyos_defined %}
  description {{ rule_config.description }}
 {%         endif %}
-{%         if rule_config.match is defined and rule_config.match is not none %}
-{%           if rule_config.match.as_path is defined and rule_config.match.as_path is not none %}
+{%         if rule_config.match is vyos_defined %}
+{%           if rule_config.match.as_path is vyos_defined %}
  match as-path {{ rule_config.match.as_path }}
 {%           endif %}
-{%           if rule_config.match.community is defined and rule_config.match.community.community_list is defined and rule_config.match.community.community_list is not none %}
- match community {{ rule_config.match.community.community_list }} {{ 'exact-match' if rule_config.match.community.exact_match is defined }}
+{%           if rule_config.match.community.community_list is vyos_defined %}
+ match community {{ rule_config.match.community.community_list }} {{ 'exact-match' if rule_config.match.community.exact_match is vyos_defined }}
 {%           endif %}
-{%           if rule_config.match.extcommunity is defined and rule_config.match.extcommunity is not none %}
+{%           if rule_config.match.extcommunity is vyos_defined %}
  match extcommunity {{ rule_config.match.extcommunity }}
 {%           endif %}
-{%           if rule_config.match.evpn is defined and rule_config.match.evpn.default_route is defined %}
+{%           if rule_config.match.evpn.default_route is vyos_defined %}
  match evpn default-route
 {%           endif %}
-{%           if rule_config.match.evpn is defined and rule_config.match.evpn.rd is defined and rule_config.match.evpn.rd is not none %}
+{%           if rule_config.match.evpn.rd is vyos_defined %}
  match evpn rd {{ rule_config.match.evpn.rd }}
 {%           endif %}
-{%           if rule_config.match.evpn is defined and rule_config.match.evpn.route_type is defined and rule_config.match.evpn.route_type is not none %}
+{%           if rule_config.match.evpn.route_type is vyos_defined %}
  match evpn route-type {{ rule_config.match.evpn.route_type }}
 {%           endif %}
-{%           if rule_config.match.evpn is defined and rule_config.match.evpn.vni is defined and rule_config.match.evpn.vni is not none %}
+{%           if rule_config.match.evpn.vni is vyos_defined %}
  match evpn vni {{ rule_config.match.evpn.vni }}
 {%           endif %}
-{%           if rule_config.match.interface is defined and rule_config.match.interface is not none %}
+{%           if rule_config.match.interface is vyos_defined %}
  match interface {{ rule_config.match.interface }}
 {%           endif %}
-{%           if rule_config.match.ip is defined and rule_config.match.ip.address is defined and rule_config.match.ip.address.access_list is defined and rule_config.match.ip.address.access_list is not none %}
+{%           if rule_config.match.ip.address.access_list is vyos_defined %}
  match ip address {{ rule_config.match.ip.address.access_list }}
 {%           endif %}
-{%           if rule_config.match.ip is defined and rule_config.match.ip.address is defined and rule_config.match.ip.address.prefix_list is defined and rule_config.match.ip.address.prefix_list is not none %}
+{%           if rule_config.match.ip.address.prefix_list is vyos_defined %}
  match ip address prefix-list {{ rule_config.match.ip.address.prefix_list }}
 {%           endif %}
-{%           if rule_config.match.ip is defined and rule_config.match.ip.nexthop is defined and rule_config.match.ip.nexthop.access_list is defined and rule_config.match.ip.nexthop.access_list is not none %}
+{%           if rule_config.match.ip.nexthop.access_list is vyos_defined %}
  match ip next-hop {{ rule_config.match.ip.nexthop.access_list }}
 {%           endif %}
-{%           if rule_config.match.ip is defined and rule_config.match.ip.nexthop is defined and rule_config.match.ip.nexthop.prefix_list is defined and rule_config.match.ip.nexthop.prefix_list is not none %}
+{%           if rule_config.match.ip.nexthop.prefix_list is vyos_defined %}
  match ip next-hop prefix-list {{ rule_config.match.ip.nexthop.prefix_list }}
 {%           endif %}
-{%           if rule_config.match.ip is defined and rule_config.match.ip.route_source is defined and rule_config.match.ip.route_source.access_list is defined and rule_config.match.ip.route_source.access_list is not none %}
+{%           if rule_config.match.ip.route_source.access_list is vyos_defined %}
  match ip route-source {{ rule_config.match.ip.route_source.access_list }}
 {%           endif %}
-{%           if rule_config.match.ip is defined and rule_config.match.ip.route_source is defined and rule_config.match.ip.route_source.prefix_list is defined and rule_config.match.ip.route_source.prefix_list is not none %}
+{%           if rule_config.match.ip.route_source.prefix_list is vyos_defined %}
  match ip route-source prefix-list {{ rule_config.match.ip.route_source.prefix_list }}
 {%           endif %}
-{%           if rule_config.match.ipv6 is defined and rule_config.match.ipv6.address is defined and rule_config.match.ipv6.address.access_list is defined and rule_config.match.ipv6.address.access_list is not none %}
+{%           if rule_config.match.ipv6.address.access_list is vyos_defined %}
  match ipv6 address {{ rule_config.match.ipv6.address.access_list }}
 {%           endif %}
-{%           if rule_config.match.ipv6 is defined and rule_config.match.ipv6.address is defined and rule_config.match.ipv6.address.prefix_list is defined and rule_config.match.ipv6.address.prefix_list is not none %}
+{%           if rule_config.match.ipv6.address.prefix_list is vyos_defined %}
  match ipv6 address prefix-list {{ rule_config.match.ipv6.address.prefix_list }}
 {%           endif %}
-{%           if rule_config.match.ipv6 is defined and rule_config.match.ipv6.nexthop is defined and rule_config.match.ipv6.nexthop is not none %}
+{%           if rule_config.match.ipv6.nexthop is vyos_defined %}
  match ipv6 next-hop address {{ rule_config.match.ipv6.nexthop }}
 {%           endif %}
-{%           if rule_config.match.large_community is defined and rule_config.match.large_community.large_community_list is defined and rule_config.match.large_community.large_community_list is not none %}
+{%           if rule_config.match.large_community.large_community_list is vyos_defined %}
  match large-community {{ rule_config.match.large_community.large_community_list }}
 {%           endif %}
-{%           if rule_config.match.local_preference is defined and rule_config.match.local_preference is not none %}
+{%           if rule_config.match.local_preference is vyos_defined %}
  match local-preference {{ rule_config.match.local_preference }}
 {%           endif %}
-{%           if rule_config.match.metric is defined and rule_config.match.metric is not none %}
+{%           if rule_config.match.metric is vyos_defined %}
  match metric {{ rule_config.match.metric }}
 {%           endif %}
-{%           if rule_config.match.origin is defined and rule_config.match.origin is not none %}
+{%           if rule_config.match.origin is vyos_defined %}
  match origin {{ rule_config.match.origin }}
 {%           endif %}
-{%           if rule_config.match.peer is defined and rule_config.match.peer is not none %}
+{%           if rule_config.match.peer is vyos_defined %}
  match peer {{ rule_config.match.peer }}
 {%           endif %}
-{%           if rule_config.match.rpki is defined and rule_config.match.rpki is not none %}
+{%           if rule_config.match.rpki is vyos_defined %}
  match rpki {{ rule_config.match.rpki }}
 {%           endif %}
-{%           if rule_config.match.tag is defined and rule_config.match.tag is not none %}
+{%           if rule_config.match.tag is vyos_defined %}
  match tag {{ rule_config.match.tag }}
 {%           endif %}
 {%         endif %}
-{%         if rule_config.on_match is defined and rule_config.on_match is not none %}
-{%           if rule_config.on_match.next is defined %}
+{%         if rule_config.on_match.next is vyos_defined %}
  on-match next
-{%           endif %}
-{%           if rule_config.on_match.goto is defined and rule_config.on_match.goto is not none %}
+{%         endif %}
+{%         if rule_config.on_match.goto is vyos_defined %}
  on-match goto {{ rule_config.on_match.goto }}
-{%           endif %}
 {%         endif %}
-{%         if rule_config.set is defined and rule_config.set is not none %}
-{%           if rule_config.set.aggregator is defined and rule_config.set.aggregator.as is defined and rule_config.set.aggregator.ip is defined %}
+{%         if rule_config.set is vyos_defined %}
+{%           if rule_config.set.aggregator.as is vyos_defined and rule_config.set.aggregator.ip is vyos_defined %}
  set aggregator as {{ rule_config.set.aggregator.as }} {{ rule_config.set.aggregator.ip }}
 {%           endif %}
-{%           if rule_config.set.as_path_exclude is defined and rule_config.set.as_path_exclude is not none %}
+{%           if rule_config.set.as_path_exclude is vyos_defined %}
  set as-path exclude {{ rule_config.set.as_path_exclude }}
 {%           endif %}
-{%           if rule_config.set.as_path_prepend is defined and rule_config.set.as_path_prepend is not none %}
+{%           if rule_config.set.as_path_prepend is vyos_defined %}
  set as-path prepend {{ rule_config.set.as_path_prepend }}
 {%           endif %}
-{%           if rule_config.set.atomic_aggregate is defined %}
+{%           if rule_config.set.atomic_aggregate is vyos_defined %}
  set atomic-aggregate
 {%           endif %}
-{%           if rule_config.set.comm_list is defined and rule_config.set.comm_list.comm_list is defined and rule_config.set.comm_list.comm_list is not none %}
- set comm-list {{ rule_config.set.comm_list.comm_list }} {{ 'delete' if rule_config.set.comm_list.delete is defined }}
+{%           if rule_config.set.comm_list.comm_list is vyos_defined %}
+ set comm-list {{ rule_config.set.comm_list.comm_list }} {{ 'delete' if rule_config.set.comm_list.delete is vyos_defined }}
 {%           endif %}
-{%           if rule_config.set.community is defined and rule_config.set.community is not none %}
+{%           if rule_config.set.community is vyos_defined %}
  set community {{ rule_config.set.community }}
 {%           endif %}
-{%           if rule_config.set.distance is defined and rule_config.set.distance is not none %}
+{%           if rule_config.set.distance is vyos_defined %}
  set distance {{ rule_config.set.distance }}
 {%           endif %}
-{%           if rule_config.set.extcommunity is defined and rule_config.set.extcommunity.bandwidth is defined and rule_config.set.extcommunity.bandwidth is not none %}
+{%           if rule_config.set.extcommunity.bandwidth is vyos_defined %}
  set extcommunity bandwidth {{ rule_config.set.extcommunity.bandwidth }}
 {%           endif %}
-{%           if rule_config.set.extcommunity is defined and rule_config.set.extcommunity.rt is defined and rule_config.set.extcommunity.rt is not none %}
+{%           if rule_config.set.extcommunity.rt is vyos_defined %}
  set extcommunity rt {{ rule_config.set.extcommunity.rt }}
 {%           endif %}
-{%           if rule_config.set.extcommunity is defined and rule_config.set.extcommunity.soo is defined and rule_config.set.extcommunity.soo is not none %}
+{%           if rule_config.set.extcommunity.soo is vyos_defined %}
  set extcommunity soo {{ rule_config.set.extcommunity.soo }}
 {%           endif %}
-{%           if rule_config.set.ip_next_hop is defined and rule_config.set.ip_next_hop is not none %}
+{%           if rule_config.set.ip_next_hop is vyos_defined %}
  set ip next-hop {{ rule_config.set.ip_next_hop }}
 {%           endif %}
-{%           if rule_config.set.ipv6_next_hop is defined and rule_config.set.ipv6_next_hop.global is defined and rule_config.set.ipv6_next_hop.global is not none %}
+{%           if rule_config.set.ipv6_next_hop.global is vyos_defined %}
  set ipv6 next-hop global {{ rule_config.set.ipv6_next_hop.global }}
 {%           endif %}
-{%           if rule_config.set.ipv6_next_hop is defined and rule_config.set.ipv6_next_hop.local is defined and rule_config.set.ipv6_next_hop.local is not none %}
+{%           if rule_config.set.ipv6_next_hop.local is vyos_defined %}
  set ipv6 next-hop local {{ rule_config.set.ipv6_next_hop.local }}
 {%           endif %}
-{%           if rule_config.set.ipv6_next_hop is defined and rule_config.set.ipv6_next_hop.peer_address is defined %}
+{%           if rule_config.set.ipv6_next_hop.peer_address is vyos_defined %}
  set ipv6 next-hop peer-address
 {%           endif %}
-{%           if rule_config.set.ipv6_next_hop is defined and rule_config.set.ipv6_next_hop.prefer_global is defined %}
+{%           if rule_config.set.ipv6_next_hop.prefer_global is vyos_defined %}
  set ipv6 next-hop prefer-global
 {%           endif %}
-{%           if rule_config.set.large_community is defined and rule_config.set.large_community is not none %}
+{%           if rule_config.set.large_community is vyos_defined %}
  set large-community {{ rule_config.set.large_community }}
 {%           endif %}
-{%           if rule_config.set.large_comm_list_delete is defined and rule_config.set.large_comm_list_delete is not none %}
+{%           if rule_config.set.large_comm_list_delete is vyos_defined %}
  set large-comm-list {{ rule_config.set.large_comm_list_delete }} delete
 {%           endif %}
-{%           if rule_config.set.local_preference is defined and rule_config.set.local_preference is not none %}
+{%           if rule_config.set.local_preference is vyos_defined %}
  set local-preference {{ rule_config.set.local_preference }}
 {%           endif %}
-{%           if rule_config.set.metric is defined and rule_config.set.metric is not none %}
+{%           if rule_config.set.metric is vyos_defined %}
  set metric {{ rule_config.set.metric }}
 {%           endif %}
-{%           if rule_config.set.metric_type is defined and rule_config.set.metric_type is not none %}
+{%           if rule_config.set.metric_type is vyos_defined %}
  set metric-type {{ rule_config.set.metric_type }}
 {%           endif %}
-{%           if rule_config.set.origin is defined and rule_config.set.origin is not none %}
+{%           if rule_config.set.origin is vyos_defined %}
  set origin {{ rule_config.set.origin }}
 {%           endif %}
-{%           if rule_config.set.originator_id is defined and rule_config.set.originator_id is not none %}
+{%           if rule_config.set.originator_id is vyos_defined %}
  set originator-id {{ rule_config.set.originator_id }}
 {%           endif %}
-{%           if rule_config.set.src is defined and rule_config.set.src is not none %}
+{%           if rule_config.set.src is vyos_defined %}
  set src {{ rule_config.set.src }}
 {%           endif %}
-{%           if rule_config.set.table is defined and rule_config.set.table is not none %}
+{%           if rule_config.set.table is vyos_defined %}
  set table {{ rule_config.set.table }}
 {%           endif %}
-{%           if rule_config.set.tag is defined and rule_config.set.tag is not none %}
+{%           if rule_config.set.tag is vyos_defined %}
  set tag {{ rule_config.set.tag }}
 {%           endif %}
-{%           if rule_config.set.weight is defined and rule_config.set.weight is not none %}
+{%           if rule_config.set.weight is vyos_defined %}
  set weight {{ rule_config.set.weight }}
 {%           endif %}
 {%         endif %}
diff --git a/data/templates/frr/rip_ripng.frr.j2 b/data/templates/frr/rip_ripng.frr.j2
index de180ee6b..3732371b2 100644
--- a/data/templates/frr/rip_ripng.frr.j2
+++ b/data/templates/frr/rip_ripng.frr.j2
@@ -1,36 +1,36 @@
-{% if default_information is defined and default_information.originate is defined %}
+{% if default_information is vyos_defined %}
  default-information originate
 {% endif %}
-{% if default_metric is defined and default_metric is not none %}
+{% if default_metric is vyos_defined %}
  default-metric {{ default_metric }}
 {% endif %}
-{% if passive_interface is defined and passive_interface is not none %}
+{% if passive_interface is vyos_defined %}
 {%   for interface in passive_interface %}
  passive-interface {{ interface }}
 {%   endfor %}
 {% endif %}
-{% if network is defined and network is not none %}
+{% if network is vyos_defined %}
 {%   for prefix in network %}
  network {{ prefix }}
 {%   endfor %}
 {% endif %}
-{% if interface is defined and interface is not none %}
+{% if interface is vyos_defined %}
 {%   for ifname in interface %}
  network {{ ifname }}
 {%   endfor %}
 {% endif %}
-{% if route is defined and route is not none %}
+{% if route is vyos_defined %}
 {%   for prefix in route %}
  route {{ prefix }}
 {%   endfor %}
 {% endif %}
 {# timers have default values #}
  timers basic {{ timers['update'] }} {{ timers.timeout }} {{ timers.garbage_collection }}
-{% if redistribute is defined and redistribute is not none %}
+{% if redistribute is vyos_defined %}
 {%   for protocol, protocol_config in redistribute.items() %}
-{%     if protocol == 'ospfv3' %}
+{%     if protocol is vyos_defined('ospfv3') %}
 {%       set protocol = 'ospf6' %}
 {%     endif %}
- redistribute {{ protocol }} {{ 'metric ' + protocol_config.metric if protocol_config.metric is defined }} {{ 'route-map ' + protocol_config.route_map if protocol_config.route_map is defined }}
+ redistribute {{ protocol }} {{ 'metric ' ~ protocol_config.metric if protocol_config.metric is vyos_defined }} {{ 'route-map ' ~ protocol_config.route_map if protocol_config.route_map is vyos_defined }}
 {%   endfor %}
 {% endif %}
diff --git a/data/templates/frr/ripd.frr.tmpl b/data/templates/frr/ripd.frr.tmpl
index c44bb6d27..2dbb93052 100644
--- a/data/templates/frr/ripd.frr.tmpl
+++ b/data/templates/frr/ripd.frr.tmpl
@@ -1,11 +1,11 @@
 {# RIP key-chain definition #}
-{% if interface is defined and interface is not none %}
+{% if interface is vyos_defined %}
 {%   for iface, iface_config in interface.items() %}
-{%     if iface_config.authentication is defined and iface_config.authentication.md5 is defined and iface_config.authentication.md5 is not none %}
+{%     if iface_config.authentication.md5 is vyos_defined %}
 key chain {{ iface }}-rip
 {%       for key_id, key_options in iface_config.authentication.md5.items() %}
  key {{ key_id }}
-{%         if key_options.password is defined and key_options.password is not none %}
+{%         if key_options.password is vyos_defined %}
   key-string {{ key_options.password }}
 {%         endif %}
  exit
@@ -16,20 +16,20 @@ exit
 {% endif %}
 !
 {# Interface specific configuration #}
-{% if interface is defined and interface is not none %}
+{% if interface is vyos_defined %}
 {%   for iface, iface_config in interface.items() %}
 interface {{ iface }}
-{%     if iface_config.authentication is defined and iface_config.authentication.plaintext_password is defined and iface_config.authentication.plaintext_password is not none %}
+{%     if iface_config.authentication.plaintext_password is vyos_defined %}
  ip rip authentication mode text
  ip rip authentication string {{ iface_config.authentication.plaintext_password }}
-{%     elif iface_config.authentication is defined and iface_config.authentication.md5 is defined and iface_config.authentication.md5 is not none %}
+{%     elif iface_config.authentication.md5 is vyos_defined %}
  ip rip authentication key-chain {{ iface }}-rip
  ip rip authentication mode md5
 {%     endif %}
-{%     if iface_config.split_horizon is defined and iface_config.split_horizon.disable is defined %}
+{%     if iface_config.split_horizon.disable is vyos_defined %}
  no ip rip split-horizon
 {%     endif %}
-{%     if iface_config.split_horizon is defined and iface_config.split_horizon.poison_reverse is defined %}
+{%     if iface_config.split_horizon.poison_reverse is vyos_defined %}
  ip rip split-horizon poisoned-reverse
 {%     endif %}
 exit
@@ -38,63 +38,55 @@ exit
 {% endif %}
 !
 router rip
-{% if default_distance is defined and default_distance is not none %}
+{% if default_distance is vyos_defined %}
  distance {{ default_distance }}
 {% endif %}
-{% if network_distance is defined and network_distance is not none %}
+{% if network_distance is vyos_defined %}
 {%   for network, network_config in network_distance.items() %}
-{%     if network_config.distance is defined and network_config.distance is not none %}
+{%     if network_config.distance is vyos_defined %}
  distance {{ network_config.distance }} {{ network }}
 {%     endif %}
 {%   endfor %}
 {% endif %}
-{% if neighbor is defined and neighbor is not none %}
+{% if neighbor is vyos_defined %}
 {%   for address in neighbor %}
  neighbor {{ address }}
 {%   endfor %}
 {% endif %}
-{% if distribute_list is defined and distribute_list is not none %}
-{%   if distribute_list.access_list is defined and distribute_list.access_list is not none %}
-{%     if distribute_list.access_list.in is defined and distribute_list.access_list.in is not none %}
+{% if distribute_list is vyos_defined %}
+{%   if distribute_list.access_list.in is vyos_defined %}
  distribute-list {{ distribute_list.access_list.in }} in
-{%     endif %}
-{%     if distribute_list.access_list.out is defined and distribute_list.access_list.out is not none %}
+{%   endif %}
+{%   if distribute_list.access_list.out is vyos_defined %}
  distribute-list {{ distribute_list.access_list.out }} out
-{%     endif %}
 {%   endif %}
-{%   if distribute_list.interface is defined and distribute_list.interface is not none %}
+{%   if distribute_list.interface is vyos_defined %}
 {%     for interface, interface_config in distribute_list.interface.items() %}
-{%       if interface_config.access_list is defined and interface_config.access_list is not none %}
-{%         if interface_config.access_list.in is defined and interface_config.access_list.in is not none %}
+{%       if interface_config.access_list.in is vyos_defined %}
  distribute-list {{ interface_config.access_list.in }} in {{ interface }}
-{%         endif %}
-{%         if interface_config.access_list.out is defined and interface_config.access_list.out is not none %}
+{%       endif %}
+{%       if interface_config.access_list.out is vyos_defined %}
  distribute-list {{ interface_config.access_list.out }} out {{ interface }}
-{%         endif %}
 {%       endif %}
-{%       if interface_config.prefix_list is defined and interface_config.prefix_list is not none %}
-{%         if interface_config.prefix_list.in is defined and interface_config.prefix_list.in is not none %}
+{%       if interface_config.prefix_list.in is vyos_defined %}
  distribute-list prefix {{ interface_config.prefix_list.in }} in {{ interface }}
-{%         endif %}
-{%         if interface_config.prefix_list.out is defined and interface_config.prefix_list.out is not none %}
+{%       endif %}
+{%       if interface_config.prefix_list.out is vyos_defined %}
  distribute-list prefix {{ interface_config.prefix_list.out }} out {{ interface }}
-{%         endif %}
 {%       endif %}
 {%     endfor %}
 {%   endif %}
-{%   if distribute_list.prefix_list is defined and distribute_list.prefix_list is not none %}
-{%     if distribute_list.prefix_list.in is defined and distribute_list.prefix_list.in is not none %}
+{%   if distribute_list.prefix_list.in is vyos_defined %}
  distribute-list prefix {{ distribute_list.prefix_list.in }} in
-{%     endif %}
-{%     if distribute_list.prefix_list.out is defined and distribute_list.prefix_list.out is not none %}
+{%   endif %}
+{%   if distribute_list.prefix_list.out is vyos_defined %}
  distribute-list prefix {{ distribute_list.prefix_list.out }} out
-{%     endif %}
 {%   endif %}
 {% endif %}
 {% include 'frr/rip_ripng.frr.j2' %}
 exit
 !
-{% if route_map is defined and route_map is not none %}
+{% if route_map is vyos_defined %}
 ip protocol rip route-map {{ route_map }}
 {% endif %}
 !
diff --git a/data/templates/frr/ripngd.frr.tmpl b/data/templates/frr/ripngd.frr.tmpl
index ca7b9b5fb..06c61dd48 100644
--- a/data/templates/frr/ripngd.frr.tmpl
+++ b/data/templates/frr/ripngd.frr.tmpl
@@ -1,11 +1,11 @@
 {# Interface specific configuration #}
-{% if interface is defined and interface is not none %}
+{% if interface is vyos_defined %}
 {%   for iface, iface_config in interface.items() %}
 interface {{ iface }}
-{%     if iface_config.split_horizon is defined and iface_config.split_horizon.disable is defined %}
+{%     if iface_config.split_horizon.disable is vyos_defined %}
  no ipv6 rip split-horizon
 {%     endif %}
-{%     if iface_config.split_horizon is defined and iface_config.split_horizon.poison_reverse is defined %}
+{%     if iface_config.split_horizon.poison_reverse is vyos_defined %}
  ipv6 rip split-horizon poisoned-reverse
 {%     endif %}
 exit
@@ -13,53 +13,45 @@ exit
 {% endif %}
 !
 router ripng
-{% if aggregate_address is defined and aggregate_address is not none %}
+{% if aggregate_address is vyos_defined %}
 {%   for prefix in aggregate_address %}
  aggregate-address {{ prefix }}
 {%   endfor %}
 {% endif %}
-{% if distribute_list is defined and distribute_list is not none %}
-{%   if distribute_list.access_list is defined and distribute_list.access_list is not none %}
-{%     if distribute_list.access_list.in is defined and distribute_list.access_list.in is not none %}
+{% if distribute_list is vyos_defined %}
+{%   if distribute_list.access_list.in is vyos_defined %}
  ipv6 distribute-list {{ distribute_list.access_list.in }} in
-{%     endif %}
-{%     if distribute_list.access_list.out is defined and distribute_list.access_list.out is not none %}
+{%   endif %}
+{%   if distribute_list.access_list.out is vyos_defined %}
  ipv6 distribute-list {{ distribute_list.access_list.out }} out
-{%     endif %}
 {%   endif %}
-{%   if distribute_list.interface is defined and distribute_list.interface is not none %}
+{%   if distribute_list.interface is vyos_defined %}
 {%     for interface, interface_config in distribute_list.interface.items() %}
-{%       if interface_config.access_list is defined and interface_config.access_list is not none %}
-{%         if interface_config.access_list.in is defined and interface_config.access_list.in is not none %}
+{%       if interface_config.access_list.in is vyos_defined %}
  ipv6 distribute-list {{ interface_config.access_list.in }} in {{ interface }}
-{%         endif %}
-{%         if interface_config.access_list.out is defined and interface_config.access_list.out is not none %}
+{%       endif %}
+{%       if interface_config.access_list.out is vyos_defined %}
  ipv6 distribute-list {{ interface_config.access_list.out }} out {{ interface }}
-{%         endif %}
 {%       endif %}
-{%       if interface_config.prefix_list is defined and interface_config.prefix_list is not none %}
-{%         if interface_config.prefix_list.in is defined and interface_config.prefix_list.in is not none %}
+{%       if interface_config.prefix_list.in is vyos_defined %}
  ipv6 distribute-list prefix {{ interface_config.prefix_list.in }} in {{ interface }}
-{%         endif %}
-{%         if interface_config.prefix_list.out is defined and interface_config.prefix_list.out is not none %}
+{%       endif %}
+{%       if interface_config.prefix_list.out is vyos_defined %}
  ipv6 distribute-list prefix {{ interface_config.prefix_list.out }} out {{ interface }}
-{%         endif %}
 {%       endif %}
 {%     endfor %}
 {%   endif %}
-{%   if distribute_list.prefix_list is defined and distribute_list.prefix_list is not none %}
-{%     if distribute_list.prefix_list.in is defined and distribute_list.prefix_list.in is not none %}
+{%   if distribute_list.prefix_list.in is vyos_defined %}
  ipv6 distribute-list prefix {{ distribute_list.prefix_list.in }} in
-{%     endif %}
-{%     if distribute_list.prefix_list.out is defined and distribute_list.prefix_list.out is not none %}
+{%   endif %}
+{%   if distribute_list.prefix_list.out is vyos_defined %}
  ipv6 distribute-list prefix {{ distribute_list.prefix_list.out }} out
-{%     endif %}
 {%   endif %}
 {% endif %}
 {% include 'frr/rip_ripng.frr.j2' %}
 exit
 !
-{% if route_map is defined and route_map is not none %}
+{% if route_map is vyos_defined %}
 ipv6 protocol ripng route-map {{ route_map }}
 {% endif %}
 !
diff --git a/data/templates/frr/rpki.frr.tmpl b/data/templates/frr/rpki.frr.tmpl
index 7f9823f6b..3f4fd3236 100644
--- a/data/templates/frr/rpki.frr.tmpl
+++ b/data/templates/frr/rpki.frr.tmpl
@@ -1,17 +1,17 @@
 !
 {# as FRR does not support deleting the entire rpki section we leave it in place even when it's empty #}
 rpki
-{% if cache is defined and cache is not none %}
+{% if cache is vyos_defined %}
 {%   for peer, peer_config in cache.items() %}
 {#     port is mandatory and preference uses a default value #}
-{%     if peer_config.ssh is defined and peer_config.ssh.username is defined and peer_config.ssh.username is not none %}
+{%     if peer_config.ssh.username is vyos_defined %}
  rpki cache {{ peer | replace('_', '-') }} {{ peer_config.port }} {{ peer_config.ssh.username }} {{ peer_config.ssh.private_key_file }} {{ peer_config.ssh.public_key_file }} {{ peer_config.ssh.known_hosts_file }} preference {{ peer_config.preference }}
 {%     else %}
  rpki cache {{ peer | replace('_', '-') }} {{ peer_config.port }} preference {{ peer_config.preference }}
 {%     endif %}
 {%   endfor %}
 {% endif %}
-{% if polling_period is defined and polling_period is not none %}
+{% if polling_period is vyos_defined %}
  rpki polling_period {{ polling_period }}
 {% endif %}
 exit
diff --git a/data/templates/frr/static_routes_macro.j2 b/data/templates/frr/static_routes_macro.j2
index 8359357b7..0b242a868 100644
--- a/data/templates/frr/static_routes_macro.j2
+++ b/data/templates/frr/static_routes_macro.j2
@@ -1,24 +1,24 @@
 {% macro static_routes(ip_ipv6, prefix, prefix_config, table=None) %}
-{%   if prefix_config.blackhole is defined %}
-{{ ip_ipv6 }} route {{ prefix }} blackhole {{ prefix_config.blackhole.distance if prefix_config.blackhole.distance is defined }} {{ 'tag ' + prefix_config.blackhole.tag if prefix_config.blackhole.tag is defined }} {{ 'table ' + table if table is defined and table is not none }}
+{%   if prefix_config.blackhole is vyos_defined %}
+{{ ip_ipv6 }} route {{ prefix }} blackhole {{ prefix_config.blackhole.distance if prefix_config.blackhole.distance is vyos_defined }} {{ 'tag ' ~ prefix_config.blackhole.tag if prefix_config.blackhole.tag is vyos_defined }} {{ 'table ' ~ table if table is vyos_defined and table is not none }}
 {%   endif %}
-{%   if prefix_config.reject is defined %}
-{{ ip_ipv6 }} route {{ prefix }} reject {{ prefix_config.reject.distance if prefix_config.reject.distance is defined }} {{ 'tag ' + prefix_config.reject.tag if prefix_config.reject.tag is defined }} {{ 'table ' + table if table is defined and table is not none }}
+{%   if prefix_config.reject is vyos_defined %}
+{{ ip_ipv6 }} route {{ prefix }} reject {{ prefix_config.reject.distance if prefix_config.reject.distance is vyos_defined }} {{ 'tag ' ~ prefix_config.reject.tag if prefix_config.reject.tag is vyos_defined }} {{ 'table ' ~ table if table is vyos_defined }}
 {%   endif %}
-{%   if prefix_config.dhcp_interface is defined and prefix_config.dhcp_interface is not none %}
+{%   if prefix_config.dhcp_interface is vyos_defined %}
 {%     set next_hop = prefix_config.dhcp_interface | get_dhcp_router %}
-{%     if next_hop is defined and next_hop is not none %}
-{{ ip_ipv6 }} route {{ prefix }} {{ next_hop }} {{ prefix_config.dhcp_interface }} {{ 'table ' + table if table is defined and table is not none }}
+{%     if next_hop is vyos_defined %}
+{{ ip_ipv6 }} route {{ prefix }} {{ next_hop }} {{ prefix_config.dhcp_interface }} {{ 'table ' ~ table if table is vyos_defined }}
 {%     endif %}
 {%   endif %}
-{%   if prefix_config.interface is defined and prefix_config.interface is not none %}
+{%   if prefix_config.interface is vyos_defined %}
 {%     for interface, interface_config in prefix_config.interface.items() if interface_config.disable is not defined %}
-{{ ip_ipv6 }} route {{ prefix }} {{ interface }} {{ interface_config.distance if interface_config.distance is defined }} {{ 'nexthop-vrf ' + interface_config.vrf if interface_config.vrf is defined }} {{ 'table ' + table if table is defined and table is not none }}
+{{ ip_ipv6 }} route {{ prefix }} {{ interface }} {{ interface_config.distance if interface_config.distance is vyos_defined }} {{ 'nexthop-vrf ' ~ interface_config.vrf if interface_config.vrf is vyos_defined }} {{ 'table ' ~ table if table is vyos_defined }}
 {%     endfor %}
 {%   endif %}
-{%   if prefix_config.next_hop is defined and prefix_config.next_hop is not none %}
+{%   if prefix_config.next_hop is vyos_defined and prefix_config.next_hop is not none %}
 {%     for next_hop, next_hop_config in prefix_config.next_hop.items() if next_hop_config.disable is not defined %}
-{{ ip_ipv6 }} route {{ prefix }} {{ next_hop }} {{ next_hop_config.interface if next_hop_config.interface is defined }} {{ next_hop_config.distance if next_hop_config.distance is defined }} {{ 'nexthop-vrf ' + next_hop_config.vrf if next_hop_config.vrf is defined }} {{ 'table ' + table if table is defined and table is not none }}
+{{ ip_ipv6 }} route {{ prefix }} {{ next_hop }} {{ next_hop_config.interface if next_hop_config.interface is vyos_defined }} {{ next_hop_config.distance if next_hop_config.distance is vyos_defined }} {{ 'nexthop-vrf ' ~ next_hop_config.vrf if next_hop_config.vrf is vyos_defined }} {{ 'table ' ~ table if table is vyos_defined}}
 {%     endfor %}
 {%   endif %}
 {% endmacro %}
diff --git a/data/templates/frr/staticd.frr.tmpl b/data/templates/frr/staticd.frr.tmpl
index 5d833228a..c7138b12b 100644
--- a/data/templates/frr/staticd.frr.tmpl
+++ b/data/templates/frr/staticd.frr.tmpl
@@ -2,7 +2,7 @@
 !
 {% set ip_prefix = 'ip' %}
 {% set ipv6_prefix = 'ipv6' %}
-{% if vrf is defined and vrf is not none %}
+{% if vrf is vyos_defined %}
 {#   We need to add an additional whitespace in front of the prefix #}
 {#   when VRFs are in use, thus we use a variable for prefix handling #}
 {%   set ip_prefix = ' ip' %}
@@ -10,40 +10,40 @@
 vrf {{ vrf }}
 {% endif %}
 {# IPv4 routing #}
-{% if route is defined and route is not none %}
+{% if route is vyos_defined %}
 {%   for prefix, prefix_config in route.items() %}
 {{ static_routes(ip_prefix, prefix, prefix_config) }}
 {%-   endfor -%}
 {% endif %}
 {# IPv4 default routes from DHCP interfaces #}
-{% if dhcp is defined and dhcp is not none %}
+{% if dhcp is vyos_defined %}
 {%   for interface, interface_config in dhcp.items() %}
 {%     set next_hop = interface | get_dhcp_router %}
-{%     if next_hop is defined and next_hop is not none %}
+{%     if next_hop is vyos_defined %}
 {{ ip_prefix }} route 0.0.0.0/0 {{ next_hop }} {{ interface }} tag 210 {{ interface_config.distance }}
 {%     endif %}
 {%   endfor %}
 {% endif %}
 {# IPv6 routing #}
-{% if route6 is defined and route6 is not none %}
+{% if route6 is vyos_defined %}
 {%   for prefix, prefix_config in route6.items() %}
 {{ static_routes(ipv6_prefix, prefix, prefix_config) }}
 {%-   endfor -%}
 {% endif %}
-{% if vrf is defined and vrf is not none %}
+{% if vrf is vyos_defined %}
  exit-vrf
 {% endif %}
 !
 {# Policy route tables #}
-{% if table is defined and table is not none %}
+{% if table is vyos_defined %}
 {%   for table_id, table_config in table.items() %}
-{%     if table_config.route is defined and table_config.route is not none %}
+{%     if table_config.route is vyos_defined %}
 {%       for prefix, prefix_config in table_config.route.items() %}
 {{ static_routes('ip', prefix, prefix_config, table_id) }}
 {%-       endfor -%}
 {%     endif %}
 !
-{%     if table_config.route6 is defined and table_config.route6 is not none %}
+{%     if table_config.route6 is vyos_defined %}
 {%       for prefix, prefix_config in table_config.route6.items() %}
 {{ static_routes('ipv6', prefix, prefix_config, table_id) }}
 {%-       endfor -%}
@@ -52,7 +52,7 @@ vrf {{ vrf }}
 {%   endfor %}
 {% endif %}
 !
-{% if route_map is defined and route_map is not none %}
+{% if route_map is vyos_defined %}
 ip protocol static route-map {{ route_map }}
 !
 {% endif %}
diff --git a/data/templates/frr/vrf-vni.frr.tmpl b/data/templates/frr/vrf-vni.frr.tmpl
index 299c9719e..916b5d05d 100644
--- a/data/templates/frr/vrf-vni.frr.tmpl
+++ b/data/templates/frr/vrf-vni.frr.tmpl
@@ -1,7 +1,7 @@
-{% if name is defined and name is not none %}
+{% if name is vyos_defined %}
 {%   for vrf, vrf_config in name.items() %}
 vrf {{ vrf }}
-{%     if vrf_config.vni is defined and vrf_config.vni is not none %}
+{%     if vrf_config.vni is vyos_defined %}
  vni {{ vrf_config.vni }}
 {%     endif %}
  exit-vrf
diff --git a/data/templates/frr/vrf.route-map.frr.tmpl b/data/templates/frr/vrf.route-map.frr.tmpl
index cb0e07616..5e0c56a7b 100644
--- a/data/templates/frr/vrf.route-map.frr.tmpl
+++ b/data/templates/frr/vrf.route-map.frr.tmpl
@@ -1,10 +1,10 @@
 !
-{% if vrf is defined and vrf is not none and route_map is defined and route_map is not none %}
+{% if vrf is vyos_defined and route_map is vyos_defined %}
 vrf {{ vrf }}
  ip protocol {{ protocol }} route-map {{ route_map }}
  exit-vrf
 !
-{% elif route_map is defined and route_map is not none %}
+{% elif route_map is vyos_defined %}
 ip protocol {{ protocol }} route-map {{ route_map }}
 {% endif %}
 !