Merge pull request #384 from jjakob/bridge-fix-T2241

T2241: fix interfaces falling out of bridge

20 files changed, 638 insertions, 274 deletions

diff --git a/data/templates/openvpn/server.conf.tmpl b/data/templates/openvpn/server.conf.tmpl
index 75ab602f8..401f8e04b 100644
--- a/data/templates/openvpn/server.conf.tmpl
+++ b/data/templates/openvpn/server.conf.tmpl
@@ -74,7 +74,7 @@ nobind
 topology {% if server_topology == 'point-to-point' %}p2p{% else %}{{ server_topology }}{% endif %}
 {%- endif %}
 
-{%- if bridge_member %}
+{%- if is_bridge_member %}
 mode server
 tls-server
 {%- else %}
diff --git a/python/vyos/configdict.py b/python/vyos/configdict.py
index e1b704a31..5ab831258 100644
--- a/python/vyos/configdict.py
+++ b/python/vyos/configdict.py
@@ -23,7 +23,8 @@ from copy import deepcopy
 
 from vyos import ConfigError
 from vyos.ifconfig import Interface
-
+from vyos.validate import is_member
+from vyos.util import ifname_from_config
 
 def retrieve_config(path_hash, base_path, config):
     """
@@ -128,6 +129,7 @@ vlan_default = {
     'ipv6_dup_addr_detect': 1,
     'ingress_qos': '',
     'ingress_qos_changed': False,
+    'is_bridge_member': False,
     'mac': '',
     'mtu': 1500,
     'vif_c': [],
@@ -197,6 +199,7 @@ def intf_to_dict(conf, default):
     """
 
     intf = deepcopy(default)
+    intf['intf'] = ifname_from_config(conf)
 
     # retrieve configured interface addresses
     if conf.exists('address'):
@@ -263,15 +266,18 @@ def intf_to_dict(conf, default):
     if conf.exists('ipv6 disable-forwarding'):
         intf['ipv6_forwarding'] = 0
 
-    # Media Access Control (MAC) address
-    if conf.exists('mac'):
-        intf['mac'] = conf.return_value('mac')
+    # check if interface is member of a bridge
+    intf['is_bridge_member'] = is_member(conf, intf['intf'], 'bridge')
 
     # IPv6 Duplicate Address Detection (DAD) tries
     if conf.exists('ipv6 dup-addr-detect-transmits'):
         intf['ipv6_dup_addr_detect'] = int(
             conf.return_value('ipv6 dup-addr-detect-transmits'))
 
+    # Media Access Control (MAC) address
+    if conf.exists('mac'):
+        intf['mac'] = conf.return_value('mac')
+
     # Maximum Transmission Unit (MTU)
     if conf.exists('mtu'):
         intf['mtu'] = int(conf.return_value('mtu'))
@@ -338,14 +344,15 @@ def intf_to_dict(conf, default):
         intf['ipv6_eui64_prefix'] = act_eui
         intf['ipv6_eui64_prefix_remove'] = list_diff(eff_eui, act_eui)
 
-    # Remove the default link-local address if set.
-    if conf.exists('ipv6 address no-default-link-local'):
+    # Remove the default link-local address if set or if member of a bridge
+    if ( conf.exists('ipv6 address no-default-link-local')
+            or intf.get('is_bridge_member') ):
         intf['ipv6_eui64_prefix_remove'].append('fe80::/64')
     else:
         # add the link-local by default to make IPv6 work
         intf['ipv6_eui64_prefix'].append('fe80::/64')
 
-    # Find out if MAC has changed
+    # If MAC has changed, remove and re-add all IPv6 EUI64 addresses
     try:
         interface = Interface(intf['intf'], create=False)
         if intf['mac'] and intf['mac'] != interface.get_mac():
@@ -416,13 +423,13 @@ def add_to_dict(conf, disabled, ifdict, section, key):
 
 def vlan_to_dict(conf, default=vlan_default):
     vlan, disabled = intf_to_dict(conf, default)
-    # get the '100' in 'interfaces bonding bond0 vif-s 100
-    vlan['id'] = conf.get_level()[-1]
 
-    current_level = conf.get_level()
+    level = conf.get_level()
+    # get the '100' in 'interfaces bonding bond0 vif-s 100'
+    vlan['id'] = level[-1]
 
     # if this is a not within vif-s node, we are done
-    if current_level[-2] != 'vif-s':
+    if level[-2] != 'vif-s':
         return vlan
 
     # ethertype is mandatory on vif-s nodes and only exists here!
diff --git a/python/vyos/ifconfig/interface.py b/python/vyos/ifconfig/interface.py
index 5b3da228e..7b42e3399 100644
--- a/python/vyos/ifconfig/interface.py
+++ b/python/vyos/ifconfig/interface.py
@@ -42,6 +42,7 @@ from vyos.ifconfig.control import Control
 from vyos.ifconfig.dhcp import DHCP
 from vyos.ifconfig.vrrp import VRRP
 from vyos.ifconfig.operational import Operational
+from vyos.ifconfig import Section
 
 
 class Interface(Control):
@@ -718,3 +719,22 @@ class Interface(Control):
 
         # flush all addresses
         self._cmd(f'ip addr flush dev "{self.ifname}"')
+
+    def add_to_bridge(self, br):
+        """
+        Adds the interface to the bridge with the passed port config.
+
+        Returns False if bridge doesn't exist.
+        """
+
+        # check if the bridge exists (on boot it doesn't)
+        if br not in Section.interfaces('bridge'):
+            return False
+
+        self.flush_addrs()
+        # add interface to bridge - use Section.klass to get BridgeIf class
+        Section.klass(br)(br, create=False).add_port(self.ifname)
+
+        # TODO: port config (STP)
+
+        return True
diff --git a/python/vyos/ifconfig/section.py b/python/vyos/ifconfig/section.py
index 092236fef..926c22e8a 100644
--- a/python/vyos/ifconfig/section.py
+++ b/python/vyos/ifconfig/section.py
@@ -54,7 +54,7 @@ class Section:
         name = name.rstrip('0123456789')
         name = name.rstrip('.')
         if vlan:
-            name = name.rstrip('0123456789')
+            name = name.rstrip('0123456789.')
         return name
 
     @classmethod
@@ -137,3 +137,22 @@ class Section:
         eth, lo, vxlan, dum, ...
         """
         return list(cls._prefixes.keys())
+
+    @classmethod
+    def get_config_path(cls, name):
+        """
+        get config path to interface with .vif or .vif-s.vif-c
+        example: eth0.1.2 -> 'ethernet eth0 vif-s 1 vif-c 2'
+        Returns False if interface name is invalid (not found in sections)
+        """
+        sect = cls.section(name)
+        if sect:
+            splinterface = name.split('.')
+            intfpath = f'{sect} {splinterface[0]}'
+            if len(splinterface) == 2:
+                intfpath += f' vif {splinterface[1]}'
+            elif len(splinterface) == 3:
+                intfpath += f' vif-s {splinterface[1]} vif-c {splinterface[2]}'
+            return intfpath
+        else:
+            return False
diff --git a/python/vyos/ifconfig_vlan.py b/python/vyos/ifconfig_vlan.py
index ee009f7f9..eb7a369ec 100644
--- a/python/vyos/ifconfig_vlan.py
+++ b/python/vyos/ifconfig_vlan.py
@@ -63,8 +63,10 @@ def apply_vlan_config(vlan, config):
     # Maximum Transmission Unit (MTU)
     vlan.set_mtu(config['mtu'])
 
-    # assign/remove VRF
-    vlan.set_vrf(config['vrf'])
+    # assign/remove VRF (ONLY when not a member of a bridge,
+    # otherwise 'nomaster' removes it from it)
+    if not config['is_bridge_member']:
+        vlan.set_vrf(config['vrf'])
 
     # Delete old IPv6 EUI64 addresses before changing MAC
     for addr in config['ipv6_eui64_prefix_remove']:
@@ -92,6 +94,10 @@ def apply_vlan_config(vlan, config):
     for addr in config['address']:
         vlan.add_addr(addr)
 
+    # re-add ourselves to any bridge we might have fallen out of
+    if config['is_bridge_member']:
+        vlan.add_to_bridge(config['is_bridge_member'])
+
 def verify_vlan_config(config):
     """
     Generic function to verify VLAN config consistency. Instead of re-
@@ -103,9 +109,22 @@ def verify_vlan_config(config):
         if vif['dhcpv6_prm_only'] and vif['dhcpv6_temporary']:
             raise ConfigError('DHCPv6 temporary and parameters-only options are mutually exclusive!')
 
-        vrf_name = vif['vrf']
-        if vrf_name and vrf_name not in interfaces():
-            raise ConfigError(f'VRF "{vrf_name}" does not exist')
+        if ( vif['is_bridge_member']
+                and ( vif['address']
+                    or vif['ipv6_eui64_prefix']
+                    or vif['ipv6_autoconf'] ) ):
+            raise ConfigError((
+                    f'Cannot assign address to vif interface {vif["intf"]} '
+                    f'which is a member of bridge {vif["is_bridge_member"]}'))
+
+        if vif['vrf']:
+            if vif['vrf'] not in interfaces():
+                raise ConfigError(f'VRF "{vif["vrf"]}" does not exist')
+
+            if vif['is_bridge_member']:
+                raise ConfigError((
+                    f'vif {vif["intf"]} cannot be member of VRF {vif["vrf"]} '
+                    f'and bridge {vif["is_bridge_member"]} at the same time!'))
 
     # e.g. wireless interface has no vif_s support
     # thus we bail out eraly.
@@ -121,17 +140,42 @@ def verify_vlan_config(config):
         if vif_s['dhcpv6_prm_only'] and vif_s['dhcpv6_temporary']:
             raise ConfigError('DHCPv6 temporary and parameters-only options are mutually exclusive!')
 
-            vrf_name = vif_s['vrf']
-            if vrf_name and vrf_name not in interfaces():
-                raise ConfigError(f'VRF "{vrf_name}" does not exist')
+        if ( vif_s['is_bridge_member']
+                and ( vif_s['address']
+                    or vif_s['ipv6_eui64_prefix']
+                    or vif_s['ipv6_autoconf'] ) ):
+            raise ConfigError((
+                    f'Cannot assign address to vif-s interface {vif_s["intf"]} '
+                    f'which is a member of bridge {vif_s["is_bridge_member"]}'))
+
+        if vif_s['vrf']:
+            if vif_s['vrf'] not in interfaces():
+                raise ConfigError(f'VRF "{vif_s["vrf"]}" does not exist')
+
+            if vif_s['is_bridge_member']:
+                raise ConfigError((
+                    f'vif-s {vif_s["intf"]} cannot be member of VRF {vif_s["vrf"]} '
+                    f'and bridge {vif_s["is_bridge_member"]} at the same time!'))
 
         for vif_c in vif_s['vif_c']:
             # DHCPv6 parameters-only and temporary address are mutually exclusive
             if vif_c['dhcpv6_prm_only'] and vif_c['dhcpv6_temporary']:
                 raise ConfigError('DHCPv6 temporary and parameters-only options are mutually exclusive!')
 
-            vrf_name = vif_c['vrf']
-            if vrf_name and vrf_name not in interfaces():
-                raise ConfigError(f'VRF "{vrf_name}" does not exist')
-
+            if ( vif_c['is_bridge_member']
+                    and ( vif_c['address']
+                        or vif_c['ipv6_eui64_prefix']
+                        or vif_c['ipv6_autoconf'] ) ):
+                raise ConfigError((
+                    f'Cannot assign address to vif-c interface {vif_c["intf"]} '
+                    f'which is a member of bridge {vif_c["is_bridge_member"]}'))
+
+            if vif_c['vrf']:
+                if vif_c['vrf'] not in interfaces():
+                    raise ConfigError(f'VRF "{vif_c["vrf"]}" does not exist')
+
+                if vif_c['is_bridge_member']:
+                    raise ConfigError((
+                    f'vif-c {vif_c["intf"]} cannot be member of VRF {vif_c["vrf"]} '
+                    f'and bridge {vif_c["is_bridge_member"]} at the same time!'))
 
diff --git a/python/vyos/util.py b/python/vyos/util.py
index 92b6f7992..e598e0ff3 100644
--- a/python/vyos/util.py
+++ b/python/vyos/util.py
@@ -498,3 +498,74 @@ def get_half_cpus():
     if cpu > 1:
         cpu /= 2
     return int(cpu)
+
+def ifname_from_config(conf):
+    """
+    Gets interface name with VLANs from current config level.
+    Level must be at the interface whose name we want.
+
+    Example:
+    >>> from vyos.util import ifname_from_config
+    >>> from vyos.config import Config
+    >>> conf = Config()
+    >>> conf.set_level('interfaces ethernet eth0 vif-s 1 vif-c 2')
+    >>> ifname_from_config(conf)
+    'eth0.1.2'
+    """
+    level = conf.get_level()
+
+    # vlans
+    if level[-2] == 'vif' or level[-2] == 'vif-s':
+        return level[-3] + '.' + level[-1]
+    if level[-2] == 'vif-c':
+        return level[-5] + '.' + level[-3] + '.' + level[-1]
+
+    # no vlans
+    return level[-1]
+
+def get_bridge_member_config(conf, br, intf):
+    """
+    Gets bridge port (member) configuration
+
+    Arguments:
+    conf: Config
+    br: bridge name
+    intf: interface name
+
+    Returns:
+    dict with the configuration
+    False if bridge or bridge port doesn't exist
+    """
+    old_level = conf.get_level()
+    conf.set_level([])
+
+    bridge = f'interfaces bridge {br}'
+    member = f'{bridge} member interface {intf}'
+    if not ( conf.exists(bridge) and conf.exists(member) ):
+        return False
+
+    # default bridge port configuration
+    # cost and priority initialized with linux defaults
+    # by reading /sys/devices/virtual/net/br0/brif/eth2/{path_cost,priority}
+    # after adding interface to bridge after reboot
+    memberconf = {
+        'cost': 100,
+        'priority': 32,
+        'arp_cache_tmo': 30,
+        'disable_link_detect': 1,
+    }
+
+    if conf.exists(f'{member} cost'):
+        memberconf['cost'] = int(conf.return_value(f'{member} cost'))
+
+    if conf.exists(f'{member} priority'):
+        memberconf['priority'] = int(conf.return_value(f'{member} priority'))
+
+    if conf.exists(f'{bridge} ip arp-cache-timeout'):
+        memberconf['arp_cache_tmo'] = int(conf.return_value(f'{bridge} ip arp-cache-timeout'))
+
+    if conf.exists(f'{bridge} disable-link-detect'):
+        memberconf['disable_link_detect'] = 2
+
+    conf.set_level(old_level)
+    return memberconf
diff --git a/python/vyos/validate.py b/python/vyos/validate.py
index 446f6e4ca..e083604c5 100644
--- a/python/vyos/validate.py
+++ b/python/vyos/validate.py
@@ -241,26 +241,66 @@ def assert_mac(m):
     if octets[:5] == (0, 0, 94, 0, 1):
         raise ValueError(f'{m} is a VRRP MAC address')
 
-def is_bridge_member(conf, interface):
+def is_member(conf, interface, intftype=None):
     """
-    Checks if passed interfaces is part of a bridge device or not.
-
-    Returns a tuple:
-    None -> Interface not a bridge member
-    Bridge -> Interface is a member of this bridge
+    Checks if passed interface is member of other interface of specified type.
+    intftype is optional, if not passed it will search all known types
+    (currently bridge and bonding)
+
+    Returns:
+    None -> Interface is not a member
+    interface name -> Interface is a member of this interface
+    False -> interface type cannot have members
     """
     ret_val = None
-    old_level = conf.get_level()
+
+    if intftype not in ['bonding', 'bridge', None]:
+        raise ValueError((
+            f'unknown interface type "{intftype}" or it cannot '
+            f'have member interfaces'))
+
+    intftype = ['bonding', 'bridge'] if intftype == None else [intftype]
 
     # set config level to root
+    old_level = conf.get_level()
     conf.set_level([])
-    base = ['interfaces', 'bridge']
-    for bridge in conf.list_nodes(base):
-        members = conf.list_nodes(base + [bridge, 'member', 'interface'])
-        if interface in members:
-            ret_val = bridge
-            break
+
+    for it in intftype:
+        base = 'interfaces ' + it
+        for intf in conf.list_nodes(base):
+            memberintf = f'{base} {intf} member interface'
+            if conf.is_tag(memberintf):
+                if interface in conf.list_nodes(memberintf):
+                    ret_val = intf
+                    break
+            elif conf.is_leaf(memberintf):
+                if ( conf.exists(memberintf) and
+                        interface in conf.return_values(memberintf) ):
+                    ret_val = intf
+                    break
 
     old_level = conf.set_level(old_level)
     return ret_val
 
+def has_address_configured(conf, intf):
+    """
+    Checks if interface has an address configured.
+    Checks the following config nodes:
+    'address', 'ipv6 address eui64', 'ipv6 address autoconf'
+
+    Returns True if interface has address configured, False if it doesn't.
+    """
+    from vyos.ifconfig import Section
+    ret = False
+
+    old_level = conf.get_level()
+    conf.set_level([])
+
+    intfpath = 'interfaces ' + Section.get_config_path(intf)
+    if ( conf.exists(f'{intfpath} address') or
+            conf.exists(f'{intfpath} ipv6 address autoconf') or
+            conf.exists(f'{intfpath} ipv6 address eui64') ):
+        ret = True
+
+    conf.set_level(old_level)
+    return ret
diff --git a/src/conf_mode/interfaces-bonding.py b/src/conf_mode/interfaces-bonding.py
index a174e33e4..82b7c0f2a 100755
--- a/src/conf_mode/interfaces-bonding.py
+++ b/src/conf_mode/interfaces-bonding.py
@@ -20,12 +20,12 @@ from copy import deepcopy
 from sys import exit
 from netifaces import interfaces
 
-from vyos.ifconfig import BondIf, Section
+from vyos.ifconfig import BondIf
 from vyos.ifconfig_vlan import apply_vlan_config, verify_vlan_config
 from vyos.configdict import list_diff, intf_to_dict, add_to_dict
 from vyos.config import Config
 from vyos.util import call, cmd
-from vyos.validate import is_bridge_member
+from vyos.validate import is_member, has_address_configured
 from vyos import ConfigError
 
 default_config_data = {
@@ -111,15 +111,12 @@ def get_config():
         bond = deepcopy(default_config_data)
         bond['intf'] = ifname
         bond['deleted'] = True
-        # check if interface is member if a bridge
-        bond['is_bridge_member'] = is_bridge_member(conf, ifname)
         return bond
 
     # set new configuration level
     conf.set_level(cfg_base)
 
     bond, disabled = intf_to_dict(conf, default_config_data)
-    bond['intf'] = ifname
 
     # ARP link monitoring frequency in milliseconds
     if conf.exists('arp-monitor interval'):
@@ -175,22 +172,38 @@ def get_config():
 def verify(bond):
     if bond['deleted']:
         if bond['is_bridge_member']:
-            interface = bond['intf']
-            bridge = bond['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Cannot delete interface "{bond["intf"]}" as it is a '
+                f'member of bridge "{bond["is_bridge_member"]}"!'))
+
         return None
 
-    if len (bond['arp_mon_tgt']) > 16:
-        raise ConfigError('The maximum number of targets that can be specified is 16')
+    if len(bond['arp_mon_tgt']) > 16:
+        raise ConfigError('The maximum number of arp-monitor targets is 16')
 
     if bond['primary']:
         if bond['mode'] not in ['active-backup', 'balance-tlb', 'balance-alb']:
-            raise ConfigError('Mode dependency failed, primary not supported ' \
-                              'in mode "{}"!'.format(bond['mode']))
+            raise ConfigError((
+                'Mode dependency failed, primary not supported in mode '
+                f'"{bond["mode"]}"!'))
+
+    if ( bond['is_bridge_member']
+            and ( bond['address']
+                or bond['ipv6_eui64_prefix']
+                or bond['ipv6_autoconf'] ) ):
+        raise ConfigError((
+            f'Cannot assign address to interface "{bond["intf"]}" '
+            f'as it is a member of bridge "{bond["is_bridge_member"]}"!'))
+
+    if bond['vrf']:
+        if bond['vrf'] not in interfaces():
+            raise ConfigError(f'VRF "{bond["vrf"]}" does not exist')
 
-    vrf_name = bond['vrf']
-    if vrf_name and vrf_name not in interfaces():
-        raise ConfigError(f'VRF "{vrf_name}" does not exist')
+        if bond['is_bridge_member']:
+            raise ConfigError((
+                f'Interface "{bond["intf"]}" cannot be member of VRF '
+                f'"{bond["vrf"]}" and bridge {bond["is_bridge_member"]} '
+                f'at the same time!'))
 
     # use common function to verify VLAN configuration
     verify_vlan_config(bond)
@@ -199,51 +212,55 @@ def verify(bond):
     for intf in bond['member']:
         # check if member interface is "real"
         if intf not in interfaces():
-            raise ConfigError('interface {} does not exist!'.format(intf))
+            raise ConfigError(f'Interface {intf} does not exist!')
 
         # a bonding member interface is only allowed to be assigned to one bond!
         all_bonds = conf.list_nodes('interfaces bonding')
         # We do not need to check our own bond
         all_bonds.remove(bond['intf'])
         for tmp in all_bonds:
-            if conf.exists('interfaces bonding ' + tmp + ' member interface ' + intf):
-                raise ConfigError('can not enslave interface {} which already ' \
-                                  'belongs to {}'.format(intf, tmp))
+            if conf.exists('interfaces bonding {tmp} member interface {intf}'):
+                raise ConfigError((
+                    f'Cannot add interface "{intf}" to bond "{bond["intf"]}", '
+                    f'it is already a member of bond "{tmp}"!'))
 
         # can not add interfaces with an assigned address to a bond
-        if conf.exists('interfaces ethernet ' + intf + ' address'):
-            raise ConfigError('can not enslave interface {} which has an address ' \
-                              'assigned'.format(intf))
-
-        # bond members are not allowed to be bridge members, too
-        for tmp in conf.list_nodes('interfaces bridge'):
-            if conf.exists('interfaces bridge ' + tmp + ' member interface ' + intf):
-                raise ConfigError('can not enslave interface {} which belongs to ' \
-                                  'bridge {}'.format(intf, tmp))
-
-        # bond members are not allowed to be vrrp members, too
+        if has_address_configured(conf, intf):
+            raise ConfigError((
+                f'Cannot add interface "{intf}" to bond "{bond["intf"]}", '
+                f'it has an address assigned!'))
+
+        # bond members are not allowed to be bridge members
+        tmp = is_member(conf, intf, 'bridge')
+        if tmp:
+            raise ConfigError((
+                    f'Cannot add interface "{intf}" to bond "{bond["intf"]}", '
+                    f'it is already a member of bridge "{tmp}"!'))
+
+        # bond members are not allowed to be vrrp members
         for tmp in conf.list_nodes('high-availability vrrp group'):
-            if conf.exists('high-availability vrrp group ' + tmp + ' interface ' + intf):
-                raise ConfigError('can not enslave interface {} which belongs to ' \
-                                  'VRRP group {}'.format(intf, tmp))
+            if conf.exists('high-availability vrrp group {tmp} interface {intf}'):
+                raise ConfigError((
+                    f'Cannot add interface "{intf}" to bond "{bond["intf"]}", '
+                    f'it is already a member of VRRP group "{tmp}"!'))
 
         # bond members are not allowed to be underlaying psuedo-ethernet devices
         for tmp in conf.list_nodes('interfaces pseudo-ethernet'):
-            if conf.exists('interfaces pseudo-ethernet ' + tmp + ' link ' + intf):
-                raise ConfigError('can not enslave interface {} which belongs to ' \
-                                  'pseudo-ethernet {}'.format(intf, tmp))
+            if conf.exists('interfaces pseudo-ethernet {tmp} link {intf}'):
+                raise ConfigError((
+                    f'Cannot add interface "{intf}" to bond "{bond["intf"]}", '
+                    f'it is already the link of pseudo-ethernet "{tmp}"!'))
 
         # bond members are not allowed to be underlaying vxlan devices
         for tmp in conf.list_nodes('interfaces vxlan'):
-            if conf.exists('interfaces vxlan ' + tmp + ' link ' + intf):
-                raise ConfigError('can not enslave interface {} which belongs to ' \
-                                  'vxlan {}'.format(intf, tmp))
-
+            if conf.exists('interfaces vxlan {tmp} link {intf}'):
+                raise ConfigError((
+                    f'Cannot add interface "{intf}" to bond "{bond["intf"]}", '
+                    f'it is already the link of VXLAN "{tmp}"!'))
 
     if bond['primary']:
         if bond['primary'] not in bond['member']:
-            raise ConfigError('primary interface must be a member interface of {}' \
-                              .format(bond['intf']))
+            raise ConfigError(f'Bond "{bond["intf"]}" primary interface must be a member')
 
         if bond['mode'] not in ['active-backup', 'balance-tlb', 'balance-alb']:
             raise ConfigError('primary interface only works for mode active-backup, ' \
@@ -256,7 +273,6 @@ def verify(bond):
 
     return None
 
-
 def generate(bond):
     return None
 
@@ -365,12 +381,9 @@ def apply(bond):
 
             # Add (enslave) interfaces to bond
             for intf in bond['member']:
-                # flushes only children of Interfaces class (e.g. vlan are not)
-                if intf in Section.interfaces():
-                    klass = Section.klass(intf, vlan=False)
-                    klass(intf, create=False).flush_addrs()
-                # flushes also vlan interfaces
-                call(f'ip addr flush dev "{intf}"')
+                # if we've come here we already verified the interface doesn't
+                # have addresses configured so just flush any remaining ones
+                cmd(f'ip addr flush dev "{intf}"')
                 b.add_port(intf)
 
         # As the bond interface is always disabled first when changing
@@ -389,8 +402,14 @@ def apply(bond):
         for addr in bond['address']:
             b.add_addr(addr)
 
-        # assign/remove VRF
-        b.set_vrf(bond['vrf'])
+        # assign/remove VRF (ONLY when not a member of a bridge,
+        # otherwise 'nomaster' removes it from it)
+        if not bond['is_bridge_member']:
+            b.set_vrf(bond['vrf'])
+
+        # re-add ourselves to any bridge we might have fallen out of
+        if bond['is_bridge_member']:
+            b.add_to_bridge(bond['is_bridge_member'])
 
         # remove no longer required service VLAN interfaces (vif-s)
         for vif_s in bond['vif_s_remove']:
diff --git a/src/conf_mode/interfaces-bridge.py b/src/conf_mode/interfaces-bridge.py
index 9d638653c..c43fae78b 100755
--- a/src/conf_mode/interfaces-bridge.py
+++ b/src/conf_mode/interfaces-bridge.py
@@ -23,8 +23,9 @@ from netifaces import interfaces
 from vyos.ifconfig import BridgeIf, Section
 from vyos.ifconfig.stp import STP
 from vyos.configdict import list_diff
+from vyos.validate import is_member, has_address_configured
 from vyos.config import Config
-from vyos.util import cmd
+from vyos.util import cmd, get_bridge_member_config
 from vyos import ConfigError
 
 default_config_data = {
@@ -202,22 +203,12 @@ def get_config():
 
     # Determine bridge member interface (currently configured)
     for intf in conf.list_nodes('member interface'):
-        # cost and priority initialized with linux defaults
-        # by reading /sys/devices/virtual/net/br0/brif/eth2/{path_cost,priority}
-        # after adding interface to bridge after reboot
-        iface = {
-            'name': intf,
-            'cost': 100,
-            'priority': 32
-        }
-
-        if conf.exists('member interface {} cost'.format(intf)):
-            iface['cost'] = int(conf.return_value('member interface {} cost'.format(intf)))
-
-        if conf.exists('member interface {} priority'.format(intf)):
-            iface['priority'] = int(conf.return_value('member interface {} priority'.format(intf)))
-
-        bridge['member'].append(iface)
+        # defaults are stored in util.py (they can't be here as all interface
+        # scripts use the function)
+        memberconf = get_bridge_member_config(conf, bridge['intf'], intf)
+        if memberconf:
+            memberconf['name'] = intf
+            bridge['member'].append(memberconf)
 
     # Determine bridge member interface (currently effective) - to determine which
     # interfaces is no longer assigend to the bridge and thus can be removed
@@ -248,30 +239,40 @@ def verify(bridge):
         raise ConfigError(f'VRF "{vrf_name}" does not exist')
 
     conf = Config()
-    for br in conf.list_nodes('interfaces bridge'):
-        # it makes no sense to verify ourself in this case
-        if br == bridge['intf']:
-            continue
-
-        for intf in bridge['member']:
-            tmp = conf.list_nodes('interfaces bridge {} member interface'.format(br))
-            if intf['name'] in tmp:
-                raise ConfigError('Interface "{}" belongs to bridge "{}" and can not be enslaved.'.format(intf['name'], bridge['intf']))
-
-    # the interface must exist prior adding it to a bridge
     for intf in bridge['member']:
+        # the interface must exist prior adding it to a bridge
         if intf['name'] not in interfaces():
-            raise ConfigError('Can not add non existing interface "{}" to bridge "{}"'.format(intf['name'], bridge['intf']))
+            raise ConfigError((
+                f'Cannot add nonexistent interface "{intf["name"]}" '
+                f'to bridge "{bridge["intf"]}"'))
 
         if intf['name'] == 'lo':
             raise ConfigError('Loopback interface "lo" can not be added to a bridge')
 
-    # bridge members are not allowed to be bond members, too
-    for intf in bridge['member']:
-        for bond in conf.list_nodes('interfaces bonding'):
-            if conf.exists('interfaces bonding ' + bond + ' member interface'):
-                if intf['name'] in conf.return_values('interfaces bonding ' + bond + ' member interface'):
-                    raise ConfigError('Interface {} belongs to bond {}, can not add it to {}'.format(intf['name'], bond, bridge['intf']))
+        # bridge members aren't allowed to be members of another bridge
+        for br in conf.list_nodes('interfaces bridge'):
+            # it makes no sense to verify ourself in this case
+            if br == bridge['intf']:
+                continue
+
+            tmp = conf.list_nodes(f'interfaces bridge {br} member interface')
+            if intf['name'] in tmp:
+                raise ConfigError((
+                    f'Cannot add interface "{intf["name"]}" to bridge '
+                    f'"{bridge["intf"]}", it is already a member of bridge "{br}"!'))
+
+        # bridge members are not allowed to be bond members
+        tmp = is_member(conf, intf['name'], 'bonding')
+        if tmp:
+            raise ConfigError((
+                f'Cannot add interface "{intf["name"]}" to bridge '
+                f'"{bridge["intf"]}", it is already a member of bond "{tmp}"!'))
+
+        # bridge members must not have an assigned address
+        if has_address_configured(conf, intf['name']):
+            raise ConfigError((
+                f'Cannot add interface "{intf["name"]}" to bridge '
+                f'"{bridge["intf"]}", it has an address assigned!'))
 
     return None
 
@@ -347,12 +348,8 @@ def apply(bridge):
 
         # add interfaces to bridge
         for member in bridge['member']:
-            # flushes address of only children of Interfaces class
-            # (e.g. vlan are not)
-            if member['name'] in Section.interfaces():
-                klass = Section.klass(member['name'], vlan=False)
-                klass(member['name'], create=False).flush_addrs()
-            # flushes all interfaces
+            # if we've come here we already verified the interface doesn't
+            # have addresses configured so just flush any remaining ones
             cmd(f'ip addr flush dev "{member["name"]}"')
             br.add_port(member['name'])
 
@@ -382,9 +379,9 @@ def apply(bridge):
         for member in bridge['member']:
             i = STPBridgeIf(member['name'])
             # configure ARP cache timeout
-            i.set_arp_cache_tmo(bridge['arp_cache_tmo'])
+            i.set_arp_cache_tmo(member['arp_cache_tmo'])
             # ignore link state changes
-            i.set_link_detect(bridge['disable_link_detect'])
+            i.set_link_detect(member['disable_link_detect'])
             # set bridge port path cost
             i.set_path_cost(member['cost'])
             # set bridge port path priority
diff --git a/src/conf_mode/interfaces-dummy.py b/src/conf_mode/interfaces-dummy.py
index 23eaa4ecb..4a77b0c1a 100755
--- a/src/conf_mode/interfaces-dummy.py
+++ b/src/conf_mode/interfaces-dummy.py
@@ -23,7 +23,7 @@ from netifaces import interfaces
 from vyos.ifconfig import DummyIf
 from vyos.configdict import list_diff
 from vyos.config import Config
-from vyos.validate import is_bridge_member
+from vyos.validate import is_member
 from vyos import ConfigError
 
 default_config_data = {
@@ -47,11 +47,12 @@ def get_config():
 
     dummy['intf'] = os.environ['VYOS_TAGNODE_VALUE']
 
+    # check if we are a member of any bridge
+    dummy['is_bridge_member'] = is_member(conf, dummy['intf'], 'bridge')
+
     # Check if interface has been removed
     if not conf.exists('interfaces dummy ' + dummy['intf']):
         dummy['deleted'] = True
-        # check if interface is member if a bridge
-        dummy['is_bridge_member'] = is_bridge_member(conf, dummy['intf'])
         return dummy
 
     # set new configuration level
@@ -84,15 +85,26 @@ def get_config():
 def verify(dummy):
     if dummy['deleted']:
         if dummy['is_bridge_member']:
-            interface = dummy['intf']
-            bridge = dummy['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Interface "{dummy["intf"]}" cannot be deleted as it is a '
+                f'member of bridge "{dummy["is_bridge_member"]}"!'))
 
         return None
 
-    vrf_name = dummy['vrf']
-    if vrf_name and vrf_name not in interfaces():
-        raise ConfigError(f'VRF "{vrf_name}" does not exist')
+    if dummy['vrf']:
+        if dummy['vrf'] not in interfaces():
+            raise ConfigError(f'VRF "{dummy["vrf"]}" does not exist')
+
+        if dummy['is_bridge_member']:
+            raise ConfigError((
+                f'Interface "{dummy["intf"]}" cannot be member of VRF '
+                f'"{dummy["vrf"]}" and bridge "{dummy["is_bridge_member"]}" '
+                f'at the same time!'))
+
+    if dummy['is_bridge_member'] and dummy['address']:
+        raise ConfigError((
+            f'Cannot assign address to interface "{dummy["intf"]}" '
+            f'as it is a member of bridge "{dummy["is_bridge_member"]}"!'))
 
     return None
 
@@ -117,8 +129,10 @@ def apply(dummy):
         for addr in dummy['address']:
             d.add_addr(addr)
 
-        # assign/remove VRF
-        d.set_vrf(dummy['vrf'])
+        # assign/remove VRF (ONLY when not a member of a bridge,
+        # otherwise 'nomaster' removes it from it)
+        if not dummy['is_bridge_member']:
+            d.set_vrf(dummy['vrf'])
 
         # disable interface on demand
         if dummy['disable']:
diff --git a/src/conf_mode/interfaces-ethernet.py b/src/conf_mode/interfaces-ethernet.py
index 3ddd394d7..9b9ae931c 100755
--- a/src/conf_mode/interfaces-ethernet.py
+++ b/src/conf_mode/interfaces-ethernet.py
@@ -20,9 +20,10 @@ from sys import exit
 from copy import deepcopy
 from netifaces import interfaces
 
-from vyos.ifconfig import EthernetIf, Section
+from vyos.ifconfig import EthernetIf
 from vyos.ifconfig_vlan import apply_vlan_config, verify_vlan_config
 from vyos.configdict import list_diff, intf_to_dict, add_to_dict
+from vyos.validate import is_member
 from vyos.config import Config
 from vyos import ConfigError
 
@@ -53,6 +54,8 @@ default_config_data = {
     'ipv6_eui64_prefix_remove': [],
     'ipv6_forwarding': 1,
     'ipv6_dup_addr_detect': 1,
+    'is_bridge_member': False,
+    'is_bond_member': False,
     'intf': '',
     'mac': '',
     'mtu': 1500,
@@ -92,7 +95,6 @@ def get_config():
     conf.set_level(cfg_base)
 
     eth, disabled = intf_to_dict(conf, default_config_data)
-    eth['intf'] = ifname
 
     # disable ethernet flow control (pause frames)
     if conf.exists('disable-flow-control'):
@@ -114,6 +116,9 @@ def get_config():
     if conf.exists('ip proxy-arp-pvlan'):
         eth['ip_proxy_arp_pvlan'] = 1
 
+    # check if we are a member of any bond
+    eth['is_bond_member'] = is_member(conf, eth['intf'], 'bonding')
+
     # GRO (generic receive offload)
     if conf.exists('offload-options generic-receive'):
         eth['offload_gro'] = conf.return_value('offload-options generic-receive')
@@ -138,6 +143,11 @@ def get_config():
     if conf.exists('speed'):
         eth['speed'] = conf.return_value('speed')
 
+    # remove default IPv6 link-local address if member of a bond
+    if eth['is_bond_member'] and 'fe80::/64' in eth['ipv6_eui64_prefix']:
+        eth['ipv6_eui64_prefix'].remove('fe80::/64')
+        eth['ipv6_eui64_prefix_remove'].append('fe80::/64')
+
     add_to_dict(conf, disabled, eth, 'vif', 'vif')
     add_to_dict(conf, disabled, eth, 'vif-s', 'vif_s')
 
@@ -162,18 +172,24 @@ def verify(eth):
     if eth['dhcpv6_prm_only'] and eth['dhcpv6_temporary']:
         raise ConfigError('DHCPv6 temporary and parameters-only options are mutually exclusive!')
 
-    vrf_name = eth['vrf']
-    if vrf_name and vrf_name not in interfaces():
-        raise ConfigError(f'VRF "{vrf_name}" does not exist')
+    memberof = eth['is_bridge_member'] if eth['is_bridge_member'] else eth['is_bond_member']
 
-    conf = Config()
-    # some options can not be changed when interface is enslaved to a bond
-    for bond in conf.list_nodes('interfaces bonding'):
-        if conf.exists('interfaces bonding ' + bond + ' member interface'):
-            bond_member = conf.return_values('interfaces bonding ' + bond + ' member interface')
-            if eth['intf'] in bond_member:
-                if eth['address']:
-                    raise ConfigError(f"Can not assign address to interface {eth['intf']} which is a member of {bond}")
+    if ( memberof
+            and ( eth['address']
+                or eth['ipv6_eui64_prefix']
+                or eth['ipv6_autoconf'] ) ):
+        raise ConfigError((
+            f'Cannot assign address to interface "{eth["intf"]}" '
+            f'as it is a member of "{memberof}"!'))
+
+    if eth['vrf']:
+        if eth['vrf'] not in interfaces():
+            raise ConfigError(f'VRF "{eth["vrf"]}" does not exist')
+
+        if memberof:
+            raise ConfigError((
+                    f'Interface "{eth["intf"]}" cannot be member of VRF "{eth["vrf"]}" '
+                    f'and "{memberof}" at the same time!'))
 
     # use common function to verify VLAN configuration
     verify_vlan_config(eth)
@@ -281,8 +297,14 @@ def apply(eth):
         for addr in eth['address']:
             e.add_addr(addr)
 
-        # assign/remove VRF
-        e.set_vrf(eth['vrf'])
+        # assign/remove VRF (ONLY when not a member of a bridge or bond,
+        # otherwise 'nomaster' removes it from it)
+        if not ( eth['is_bridge_member'] or eth['is_bond_member'] ):
+            e.set_vrf(eth['vrf'])
+
+        # re-add ourselves to any bridge we might have fallen out of
+        if eth['is_bridge_member']:
+            e.add_to_bridge(eth['is_bridge_member'])
 
         # remove no longer required service VLAN interfaces (vif-s)
         for vif_s in eth['vif_s_remove']:
diff --git a/src/conf_mode/interfaces-geneve.py b/src/conf_mode/interfaces-geneve.py
index 708a64474..e4109a221 100755
--- a/src/conf_mode/interfaces-geneve.py
+++ b/src/conf_mode/interfaces-geneve.py
@@ -22,7 +22,7 @@ from netifaces import interfaces
 
 from vyos.config import Config
 from vyos.ifconfig import GeneveIf
-from vyos.validate import is_bridge_member
+from vyos.validate import is_member
 from vyos import ConfigError
 
 default_config_data = {
@@ -49,11 +49,12 @@ def get_config():
 
     geneve['intf'] = os.environ['VYOS_TAGNODE_VALUE']
 
+    # check if interface is member if a bridge
+    geneve['is_bridge_member'] = is_member(conf, geneve['intf'], 'bridge')
+
     # Check if interface has been removed
     if not conf.exists('interfaces geneve ' + geneve['intf']):
         geneve['deleted'] = True
-        # check if interface is member if a bridge
-        geneve['is_bridge_member'] = is_bridge_member(conf, geneve['intf'])
         return geneve
 
     # set new configuration level
@@ -97,12 +98,17 @@ def get_config():
 def verify(geneve):
     if geneve['deleted']:
         if geneve['is_bridge_member']:
-            interface = geneve['intf']
-            bridge = geneve['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Cannot delete interface "{geneve["intf"]}" as it is a '
+                f'member of bridge "{geneve["is_bridge_member"]}"!'))
 
         return None
 
+    if geneve['is_bridge_member'] and geneve['address']:
+        raise ConfigError((
+            f'Cannot assign address to interface "{geneve["intf"]}" '
+            f'as it is a member of bridge "{geneve["is_bridge_member"]}"!'))
+
     if not geneve['remote']:
         raise ConfigError('GENEVE remote must be configured')
 
@@ -158,6 +164,10 @@ def apply(geneve):
         if not geneve['disable']:
             g.set_admin_state('up')
 
+        # re-add ourselves to any bridge we might have fallen out of
+        if geneve['is_bridge_member']:
+            g.add_to_bridge(geneve['is_bridge_member'])
+
     return None
 
 
diff --git a/src/conf_mode/interfaces-l2tpv3.py b/src/conf_mode/interfaces-l2tpv3.py
index 33cf62f70..26bb537e5 100755
--- a/src/conf_mode/interfaces-l2tpv3.py
+++ b/src/conf_mode/interfaces-l2tpv3.py
@@ -24,7 +24,7 @@ from vyos.config import Config
 from vyos.ifconfig import L2TPv3If, Interface
 from vyos import ConfigError
 from vyos.util import call
-from vyos.validate import is_bridge_member, is_addr_assigned
+from vyos.validate import is_member, is_addr_assigned
 
 default_config_data = {
     'address': [],
@@ -66,12 +66,13 @@ def get_config():
 
     l2tpv3['intf'] = os.environ['VYOS_TAGNODE_VALUE']
 
+    # check if interface is member of a bridge
+    l2tpv3['is_bridge_member'] = is_member(conf, l2tpv3['intf'], 'bridge')
+
     # Check if interface has been removed
     if not conf.exists('interfaces l2tpv3 ' + l2tpv3['intf']):
         l2tpv3['deleted'] = True
         interface = l2tpv3['intf']
-        # check if interface is member if a bridge
-        l2tpv3['is_bridge_member'] = is_bridge_member(conf, interface)
 
         # to delete the l2tpv3 interface we need the current tunnel_id and session_id
         if conf.exists_effective(f'interfaces l2tpv3 {interface} tunnel-id'):
@@ -118,7 +119,8 @@ def get_config():
         l2tpv3['ipv6_eui64_prefix'] = conf.return_values('ipv6 address eui64')
 
     # Remove the default link-local address if set.
-    if not conf.exists('ipv6 address no-default-link-local'):
+    if not ( conf.exists('ipv6 address no-default-link-local') or
+            l2tpv3['is_bridge_member'] ):
         # add the link-local by default to make IPv6 work
         l2tpv3['ipv6_eui64_prefix'].append('fe80::/64')
 
@@ -166,9 +168,9 @@ def verify(l2tpv3):
 
     if l2tpv3['deleted']:
         if l2tpv3['is_bridge_member']:
-            interface = l2tpv3['intf']
-            bridge = l2tpv3['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Interface "{l2tpv3["intf"]}" cannot be deleted as it is a '
+                f'member of bridge "{l2tpv3["is_bridge_member"]}"!'))
 
         return None
 
@@ -193,6 +195,14 @@ def verify(l2tpv3):
     if not l2tpv3['peer_session_id']:
         raise ConfigError(f'Must configure the l2tpv3 peer-session-id for {interface}')
 
+    if ( l2tpv3['is_bridge_member']
+            and ( l2tpv3['address']
+                or l2tpv3['ipv6_eui64_prefix']
+                or l2tpv3['ipv6_autoconf'] ) ):
+        raise ConfigError((
+            f'Cannot assign address to interface "{l2tpv3["intf"]}" '
+            f'as it is a member of bridge "{l2tpv3["is_bridge_member"]}"!'))
+
     return None
 
 
@@ -254,6 +264,10 @@ def apply(l2tpv3):
         if not l2tpv3['disable']:
             l.set_admin_state('up')
 
+        # re-add ourselves to any bridge we might have fallen out of
+        if l2tpv3['is_bridge_member']:
+            l.add_to_bridge(l2tpv3['is_bridge_member'])
+
     return None
 
 if __name__ == '__main__':
diff --git a/src/conf_mode/interfaces-openvpn.py b/src/conf_mode/interfaces-openvpn.py
index 029bc1d69..c0678764f 100755
--- a/src/conf_mode/interfaces-openvpn.py
+++ b/src/conf_mode/interfaces-openvpn.py
@@ -29,7 +29,7 @@ from vyos.configdict import list_diff
 from vyos.ifconfig import VTunIf
 from vyos.template import render
 from vyos.util import call, chown, chmod_600, chmod_755
-from vyos.validate import is_addr_assigned, is_bridge_member, is_ipv4
+from vyos.validate import is_addr_assigned, is_member, is_ipv4
 from vyos import ConfigError
 
 user = 'openvpn'
@@ -41,7 +41,6 @@ default_config_data = {
     'auth_pass': '',
     'auth_user_pass_file': '',
     'auth': False,
-    'bridge_member': [],
     'compress_lzo': False,
     'deleted': False,
     'description': '',
@@ -199,21 +198,16 @@ def get_config():
     openvpn['intf'] = os.environ['VYOS_TAGNODE_VALUE']
     openvpn['auth_user_pass_file'] = f"/run/openvpn/{openvpn['intf']}.pw"
 
+    # check if interface is member of a bridge
+    openvpn['is_bridge_member'] = is_member(conf, openvpn['intf'], 'bridge')
+
     # Check if interface instance has been removed
     if not conf.exists('interfaces openvpn ' + openvpn['intf']):
         openvpn['deleted'] = True
-        # check if interface is member if a bridge
-        openvpn['is_bridge_member'] = is_bridge_member(conf, openvpn['intf'])
         return openvpn
 
-    # Check if we belong to any bridge interface
-    for bridge in conf.list_nodes('interfaces bridge'):
-        for intf in conf.list_nodes('interfaces bridge {} member interface'.format(bridge)):
-            if intf == openvpn['intf']:
-                openvpn['bridge_member'].append(intf)
-
     # bridged server should not have a pool by default (but can be specified manually)
-    if openvpn['bridge_member']:
+    if openvpn['is_bridge_member']:
         openvpn['server_pool'] = False
         openvpn['server_ipv6_pool'] = False
 
@@ -597,7 +591,7 @@ def get_config():
         default_server = getDefaultServer(server_network_v4, openvpn['server_topology'], openvpn['type'])
         if default_server:
             # server-bridge doesn't require a pool so don't set defaults for it
-            if openvpn['server_pool'] and not openvpn['bridge_member']:
+            if openvpn['server_pool'] and not openvpn['is_bridge_member']:
                 if not openvpn['server_pool_start']:
                     openvpn['server_pool_start'] = default_server['pool_start']
 
@@ -635,22 +629,15 @@ def get_config():
 def verify(openvpn):
     if openvpn['deleted']:
         if openvpn['is_bridge_member']:
-            interface = openvpn['intf']
-            bridge = openvpn['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
-
-        return None
+            raise ConfigError((
+                f'Cannot delete interface "{openvpn["intf"]}" as it is a '
+                f'member of bridge "{openvpn["is_bridge_menber"]}"!'))
+       return None
 
 
     if not openvpn['mode']:
         raise ConfigError('Must specify OpenVPN operation mode')
 
-    # Checks which need to be performed on interface rmeoval
-    if openvpn['deleted']:
-        # OpenVPN interface can not be deleted if it's still member of a bridge
-        if openvpn['bridge_member']:
-            raise ConfigError('Can not delete {} as it is a member interface of bridge {}!'.format(openvpn['intf'], bridge))
-
     # Check if we have disabled ncp and at the same time specified ncp-ciphers
     if openvpn['disable_ncp'] and openvpn['ncp_ciphers']:
         raise ConfigError('Cannot specify both "encryption disable-ncp" and "encryption ncp-ciphers"')
@@ -680,9 +667,9 @@ def verify(openvpn):
         if openvpn['ncp_ciphers']:
             raise ConfigError('encryption ncp-ciphers cannot be specified in site-to-site mode, only server or client')
 
-    if openvpn['mode'] == 'site-to-site' and not openvpn['bridge_member']:
+    if openvpn['mode'] == 'site-to-site' and not openvpn['is_bridge_member']:
         if not (openvpn['local_address'] or openvpn['ipv6_local_address']):
-            raise ConfigError('Must specify "local-address" or "bridge member interface"')
+            raise ConfigError('Must specify "local-address" or add interface to bridge')
 
         if len(openvpn['local_address']) > 1 or len(openvpn['ipv6_local_address']) > 1:
             raise ConfigError('Cannot specify more than 1 IPv4 and 1 IPv6 "local-address"')
@@ -761,8 +748,8 @@ def verify(openvpn):
                     raise ConfigError(f'Client "{client["name"]}" IP {client["ip"][0]} not in server subnet {subnet}')
 
         else:
-            if not openvpn['bridge_member']:
-                raise ConfigError('Must specify "server subnet" or "bridge member interface" in server mode')
+            if not openvpn['is_bridge_member']:
+                raise ConfigError('Must specify "server subnet" or add interface to bridge in server mode')
 
         if openvpn['server_pool']:
             if not (openvpn['server_pool_start'] and openvpn['server_pool_stop']):
diff --git a/src/conf_mode/interfaces-pseudo-ethernet.py b/src/conf_mode/interfaces-pseudo-ethernet.py
index f0f893b44..1d04d6dbe 100755
--- a/src/conf_mode/interfaces-pseudo-ethernet.py
+++ b/src/conf_mode/interfaces-pseudo-ethernet.py
@@ -21,10 +21,9 @@ from sys import exit
 from netifaces import interfaces
 
 from vyos.config import Config
-from vyos.configdict import list_diff, vlan_to_dict, intf_to_dict, add_to_dict
+from vyos.configdict import list_diff, intf_to_dict, add_to_dict
 from vyos.ifconfig import MACVLANIf, Section
 from vyos.ifconfig_vlan import apply_vlan_config, verify_vlan_config
-from vyos.validate import is_bridge_member
 from vyos import ConfigError
 
 default_config_data = {
@@ -77,15 +76,12 @@ def get_config():
     if not conf.exists(cfg_base):
         peth = deepcopy(default_config_data)
         peth['deleted'] = True
-        # check if interface is member if a bridge
-        peth['is_bridge_member'] = is_bridge_member(conf, ifname)
         return peth
 
     # set new configuration level
     conf.set_level(cfg_base)
 
     peth, disabled = intf_to_dict(conf, default_config_data)
-    peth['intf'] = ifname
 
     # ARP cache entry timeout in seconds
     if conf.exists(['ip', 'arp-cache-timeout']):
@@ -114,21 +110,37 @@ def get_config():
 def verify(peth):
     if peth['deleted']:
         if peth['is_bridge_member']:
-            interface = peth['intf']
-            bridge = peth['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Cannot delete interface "{peth["intf"]}" as it is a '
+                f'member of bridge "{peth["is_bridge_member"]}"!'))
 
         return None
 
     if not peth['source_interface']:
-        raise ConfigError('source-interface must be set for virtual ethernet {}'.format(peth['intf']))
+        raise ConfigError((
+            f'Link device must be set for pseudo-ethernet "{peth["intf"]}"'))
 
     if not peth['source_interface'] in interfaces():
-        raise ConfigError('Pseudo-ethernet source-interface does not exist')
+        raise ConfigError((
+            f'Pseudo-ethernet "{peth["intf"]}" link device does not exist')
 
-    vrf_name = peth['vrf']
-    if vrf_name and vrf_name not in interfaces():
-        raise ConfigError(f'VRF "{vrf_name}" does not exist')
+    if ( peth['is_bridge_member']
+            and ( peth['address']
+                or peth['ipv6_eui64_prefix']
+                or peth['ipv6_autoconf'] ) ):
+        raise ConfigError((
+            f'Cannot assign address to interface "{peth["intf"]}" '
+            f'as it is a member of bridge "{peth["is_bridge_member"]}"!'))
+
+    if peth['vrf']:
+        if peth['vrf'] not in interfaces():
+            raise ConfigError(f'VRF "{peth["vrf"]}" does not exist')
+
+        if peth['is_bridge_member']:
+            raise ConfigError((
+                f'Interface "{peth["intf"]}" cannot be member of VRF '
+                f'"{peth["vrf"]}" and bridge {peth["is_bridge_member"]} '
+                f'at the same time!'))
 
     # use common function to verify VLAN configuration
     verify_vlan_config(peth)
@@ -203,8 +215,10 @@ def apply(peth):
     # IPv6 Duplicate Address Detection (DAD) tries
     p.set_ipv6_dad_messages(peth['ipv6_dup_addr_detect'])
 
-    # assign/remove VRF
-    p.set_vrf(peth['vrf'])
+    # assign/remove VRF (ONLY when not a member of a bridge,
+    # otherwise 'nomaster' removes it from it)
+    if not peth['is_bridge_member']:
+        p.set_vrf(peth['vrf'])
 
     # Delete old IPv6 EUI64 addresses before changing MAC
     for addr in peth['ipv6_eui64_prefix_remove']:
@@ -235,6 +249,10 @@ def apply(peth):
     for addr in peth['address']:
         p.add_addr(addr)
 
+    # re-add ourselves to any bridge we might have fallen out of
+    if peth['is_bridge_member']:
+        p.add_to_bridge(peth['is_bridge_member'])
+
     # remove no longer required service VLAN interfaces (vif-s)
     for vif_s in peth['vif_s_remove']:
         p.del_vlan(vif_s)
diff --git a/src/conf_mode/interfaces-tunnel.py b/src/conf_mode/interfaces-tunnel.py
index fc084814a..f4cd53981 100755
--- a/src/conf_mode/interfaces-tunnel.py
+++ b/src/conf_mode/interfaces-tunnel.py
@@ -25,7 +25,7 @@ from vyos.config import Config
 from vyos.ifconfig import Interface, GREIf, GRETapIf, IPIPIf, IP6GREIf, IPIP6If, IP6IP6If, SitIf, Sit6RDIf
 from vyos.ifconfig.afi import IP4, IP6
 from vyos.configdict import list_diff
-from vyos.validate import is_ipv4, is_ipv6, is_bridge_member
+from vyos.validate import is_ipv4, is_ipv6, is_member
 from vyos import ConfigError
 from vyos.dicts import FixedDict
 
@@ -410,7 +410,7 @@ def get_config():
     options['tunnel'] = {}
 
     # check for bridges
-    options['bridge'] = is_bridge_member(conf, ifname)
+    options['bridge'] = is_member(conf, ifname, 'bridge')
     options['interfaces'] = interfaces()
 
     for name in ct:
@@ -436,11 +436,14 @@ def verify(conf):
 
     if changes['section'] == 'delete':
         if ifname in options['nhrp']:
-            raise ConfigError(f'Can not delete interface tunnel {iftype} {ifname}, it is used by nhrp')
+            raise ConfigError((
+                f'Cannot delete interface tunnel {iftype} {ifname}, '
+                'it is used by NHRP'))
 
-        bridge = options['bridge']
-        if bridge:
-            raise ConfigError(f'Interface "{ifname}" can not be deleted as it belongs to bridge "{bridge}"!')
+        if options['bridge']:
+             raise ConfigError((
+                f'Cannot delete interface "{options["ifname"]}" as it is a '
+                f'member of bridge "{options["bridge"]}"!'))
 
         # done, bail out early
         return None
@@ -525,10 +528,23 @@ def verify(conf):
         print(f'Should not use IPv6 addresses on tunnel {iftype} {ifname}')
 
     # vrf check
-
-    vrf = options['vrf']
-    if vrf and vrf not in options['interfaces']:
-        raise ConfigError(f'VRF "{vrf}" does not exist')
+    if options['vrf']:
+        if options['vrf'] not in options['interfaces']:
+            raise ConfigError(f'VRF "{options["vrf"]}" does not exist')
+
+        if options['bridge']:
+            raise ConfigError((
+                f'Interface "{options["ifname"]}" cannot be member of VRF '
+                f'"{options["vrf"]}" and bridge {options["bridge"]} '
+                f'at the same time!'))
+
+    # bridge and address check
+    if ( options['bridge']
+            and ( options['addresses-add']
+                or options['ipv6_autoconf'] ) ):
+        raise ConfigError((
+            f'Cannot assign address to interface "{options["name"]}" '
+            f'as it is a member of bridge "{options["bridge"]}"!'))
 
     # source-interface check
 
@@ -620,12 +636,17 @@ def apply(conf):
 
     # set other interface properties
     for option in ('alias', 'mtu', 'link_detect', 'multicast', 'allmulticast',
-                   'vrf', 'ipv6_autoconf', 'ipv6_forwarding', 'ipv6_dad_transmits'):
+                   'ipv6_autoconf', 'ipv6_forwarding', 'ipv6_dad_transmits'):
         if not options[option]:
             # should never happen but better safe
             continue
         tunnel.set_interface(option, options[option])
 
+    # assign/remove VRF (ONLY when not a member of a bridge,
+    # otherwise 'nomaster' removes it from it)
+    if not options['bridge']:
+        tunnel.set_vrf(options['vrf'])
+
     # Configure interface address(es)
     for addr in options['addresses-del']:
         tunnel.del_addr(addr)
diff --git a/src/conf_mode/interfaces-vxlan.py b/src/conf_mode/interfaces-vxlan.py
index 74eae4281..fabfaa9df 100755
--- a/src/conf_mode/interfaces-vxlan.py
+++ b/src/conf_mode/interfaces-vxlan.py
@@ -22,7 +22,7 @@ from netifaces import interfaces
 
 from vyos.config import Config
 from vyos.ifconfig import VXLANIf, Interface
-from vyos.validate import is_bridge_member
+from vyos.validate import is_member
 from vyos import ConfigError
 
 default_config_data = {
@@ -62,11 +62,12 @@ def get_config():
 
     vxlan['intf'] = os.environ['VYOS_TAGNODE_VALUE']
 
+    # check if interface is member if a bridge
+    vxlan['is_bridge_member'] = is_member(conf, vxlan['intf'], 'bridge')
+
     # Check if interface has been removed
     if not conf.exists('interfaces vxlan ' + vxlan['intf']):
         vxlan['deleted'] = True
-        # check if interface is member if a bridge
-        vxlan['is_bridge_member'] = is_bridge_member(conf, vxlan['intf'])
         return vxlan
 
     # set new configuration level
@@ -121,7 +122,8 @@ def get_config():
         vxlan['ipv6_eui64_prefix'] = conf.return_values('ipv6 address eui64')
 
     # Remove the default link-local address if set.
-    if not conf.exists('ipv6 address no-default-link-local'):
+    if not ( conf.exists('ipv6 address no-default-link-local')
+            or vxlan['is_bridge_member'] ):
         # add the link-local by default to make IPv6 work
         vxlan['ipv6_eui64_prefix'].append('fe80::/64')
 
@@ -163,9 +165,9 @@ def get_config():
 def verify(vxlan):
     if vxlan['deleted']:
         if vxlan['is_bridge_member']:
-            interface = vxlan['intf']
-            bridge = vxlan['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Cannot delete interface "{vxlan["intf"]}" as it is a '
+                f'member of bridge "{vxlan["is_bridge_member"]}"!')
 
         return None
 
@@ -193,6 +195,14 @@ def verify(vxlan):
             raise ConfigError('VXLAN has a 50 byte overhead, underlaying device ' \
                               'MTU is to small ({})'.format(underlay_mtu))
 
+    if ( vxlan['is_bridge_member']
+            and ( vxlan['address']
+                or vxlan['ipv6_eui64_prefix']
+                or vxlan['ipv6_autoconf'] ) ):
+        raise ConfigError((
+            f'Cannot assign address to interface "{vxlan["intf"]}" '
+            f'as it is a member of bridge "{vxlan["is_bridge_member"]}"!'))
+
     return None
 
 
@@ -264,6 +274,10 @@ def apply(vxlan):
         if not vxlan['disable']:
             v.set_admin_state('up')
 
+        # re-add ourselves to any bridge we might have fallen out of
+        if vxlan['is_bridge_member']:
+            v.add_to_bridge(vxlan['is_bridge_member'])
+
     return None
 
 
diff --git a/src/conf_mode/interfaces-wireguard.py b/src/conf_mode/interfaces-wireguard.py
index 01f84260d..820b0a724 100755
--- a/src/conf_mode/interfaces-wireguard.py
+++ b/src/conf_mode/interfaces-wireguard.py
@@ -25,7 +25,7 @@ from vyos.config import Config
 from vyos.configdict import list_diff
 from vyos.ifconfig import WireGuardIf
 from vyos.util import chown, chmod_750, call
-from vyos.validate import is_bridge_member
+from vyos.validate import is_member
 from vyos import ConfigError
 
 kdir = r'/config/auth/wireguard'
@@ -38,8 +38,8 @@ default_config_data = {
     'listen_port': '',
     'deleted': False,
     'disable': False,
-    'is_bridge_member': False,
     'fwmark': 0,
+    'is_bridge_member': False,
     'mtu': 1420,
     'peer': [],
     'peer_remove': [], # stores public keys of peers to remove
@@ -78,11 +78,12 @@ def get_config():
     wg = deepcopy(default_config_data)
     wg['intf'] = os.environ['VYOS_TAGNODE_VALUE']
 
+    # check if interface is member if a bridge
+    wg['is_bridge_member'] = is_member(conf, wg['intf'], 'bridge')
+
     # Check if interface has been removed
     if not conf.exists(base + [wg['intf']]):
         wg['deleted'] = True
-        # check if interface is member if a bridge
-        wg['is_bridge_member'] = is_bridge_member(conf, wg['intf'])
         return wg
 
     conf.set_level(base + [wg['intf']])
@@ -189,44 +190,52 @@ def get_config():
 
 
 def verify(wg):
-    interface = wg['intf']
-
     if wg['deleted']:
         if wg['is_bridge_member']:
-            interface = wg['intf']
-            bridge = wg['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Cannot delete interface "{wg["intf"]}" as it is a member '
+                f'of bridge "{wg["is_bridge_member"]}"!'))
 
         return None
 
-    vrf_name = wg['vrf']
-    if vrf_name and vrf_name not in interfaces():
-        raise ConfigError(f'VRF "{vrf_name}" does not exist')
+    if wg['is_bridge_member'] and wg['address']:
+        raise ConfigError((
+            f'Cannot assign address to interface "{wg["intf"]}" '
+            f'as it is a member of bridge "{wg["is_bridge_member"]}"!'))
+
+    if wg['vrf']:
+        if wg['vrf'] not in interfaces():
+            raise ConfigError(f'VRF "{wg["vrf"]}" does not exist')
+
+        if wg['is_bridge_member']:
+            raise ConfigError((
+                f'Interface "{wg["intf"]}" cannot be member of VRF '
+                f'"{wg["vrf"]}" and bridge {wg["is_bridge_member"]} '
+                f'at the same time!'))
 
     if not os.path.exists(wg['pk']):
         raise ConfigError('No keys found, generate them by executing:\n' \
                           '"run generate wireguard [keypair|named-keypairs]"')
 
     if not wg['address']:
-        raise ConfigError(f'IP address required for interface "{interface}"!')
+        raise ConfigError(f'IP address required for interface "{wg["intf"]}"!')
 
     if not wg['peer']:
-        raise ConfigError(f'Peer required for interface "{interface}"!')
+        raise ConfigError(f'Peer required for interface "{wg["intf"]}"!')
 
     # run checks on individual configured WireGuard peer
     for peer in wg['peer']:
-        peer_name = peer['name']
         if not peer['allowed-ips']:
-            raise ConfigError(f'Peer allowed-ips required for peer "{peer_name}"!')
+            raise ConfigError(f'Peer allowed-ips required for peer "{peer["name"]}"!')
 
         if not peer['pubkey']:
-            raise ConfigError(f'Peer public-key required for peer "{peer_name}"!')
+            raise ConfigError(f'Peer public-key required for peer "{peer["name"]}"!')
 
         if peer['address'] and not peer['port']:
-            raise ConfigError(f'Peer "{peer_name}" port must be defined if address is defined!')
+            raise ConfigError(f'Peer "{peer["name"]}" port must be defined if address is defined!')
 
         if not peer['address'] and peer['port']:
-           raise ConfigError(f'Peer "{peer_name}" address must be defined if port is defined!')
+           raise ConfigError(f'Peer "{peer["name"]}" address must be defined if port is defined!')
 
 
 def apply(wg):
@@ -252,8 +261,10 @@ def apply(wg):
     # update interface description used e.g. within SNMP
     w.set_alias(wg['description'])
 
-    # assign/remove VRF
-    w.set_vrf(wg['vrf'])
+    # assign/remove VRF (ONLY when not a member of a bridge,
+    # otherwise 'nomaster' removes it from it)
+    if not wg['is_bridge_member']:
+        w.set_vrf(wg['vrf'])
 
     # remove peers
     for pub_key in wg['peer_remove']:
diff --git a/src/conf_mode/interfaces-wireless.py b/src/conf_mode/interfaces-wireless.py
index 148a7f6e0..4d61dc303 100755
--- a/src/conf_mode/interfaces-wireless.py
+++ b/src/conf_mode/interfaces-wireless.py
@@ -29,7 +29,7 @@ from vyos.ifconfig import WiFiIf, Section
 from vyos.ifconfig_vlan import apply_vlan_config, verify_vlan_config
 from vyos.template import render
 from vyos.util import chown, call
-from vyos.validate import is_bridge_member
+from vyos.validate import is_member
 from vyos import ConfigError
 
 default_config_data = {
@@ -134,12 +134,13 @@ def get_config():
 
     wifi['intf'] = os.environ['VYOS_TAGNODE_VALUE']
 
+    # check if interface is member if a bridge
+    wifi['is_bridge_member'] = is_member(conf, wifi['intf'], 'bridge')
+
     # check if wireless interface has been removed
     cfg_base = 'interfaces wireless ' + wifi['intf']
     if not conf.exists(cfg_base):
         wifi['deleted'] = True
-        # check if interface is member if a bridge
-        wifi['is_bridge_member'] = is_bridge_member(conf, wifi['intf'])
         # we can not bail out early as wireless interface can not be removed
         # Kernel will complain with: RTNETLINK answers: Operation not supported.
         # Thus we need to remove individual settings
@@ -378,8 +379,8 @@ def get_config():
     eff_addr = conf.return_effective_values('ipv6 address eui64')
     wifi['ipv6_eui64_prefix_remove'] = list_diff(eff_addr, wifi['ipv6_eui64_prefix'])
 
-    # Remove the default link-local address if set.
-    if conf.exists('ipv6 address no-default-link-local'):
+    # Remove the default link-local address if set or if member of a bridge
+    if conf.exists('ipv6 address no-default-link-local') or wifi['is_bridge_member']:
         wifi['ipv6_eui64_prefix_remove'].append('fe80::/64')
     else:
         # add the link-local by default to make IPv6 work
@@ -551,9 +552,9 @@ def get_config():
 def verify(wifi):
     if wifi['deleted']:
         if wifi['is_bridge_member']:
-            interface = wifi['intf']
-            bridge = wifi['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Cannot delete interface "{wifi["intf"]}" as it is a '
+                f'member of bridge "{wifi["is_bridge_member"]}"!'))
 
         return None
 
@@ -598,9 +599,23 @@ def verify(wifi):
         if not radius['key']:
             raise ConfigError('Misssing RADIUS shared secret key for server: {}'.format(radius['server']))
 
-    vrf_name = wifi['vrf']
-    if vrf_name and vrf_name not in interfaces():
-        raise ConfigError(f'VRF "{vrf_name}" does not exist')
+    if ( wifi['is_bridge_member']
+            and ( wifi['address']
+                or wifi['ipv6_eui64_prefix']
+                or wifi['ipv6_autoconf'] ) ):
+        raise ConfigError((
+            f'Cannot assign address to interface "{wifi["intf"]}" '
+            f'as it is a member of bridge "{wifi["is_bridge_member"]}"!'))
+
+    if wifi['vrf']:
+        if wifi['vrf'] not in interfaces():
+            raise ConfigError(f'VRF "{wifi["vrf"]}" does not exist')
+
+        if wifi['is_bridge_member']:
+            raise ConfigError((
+                f'Interface "{wifi["intf"]}" cannot be member of VRF '
+                f'"{wifi["vrf"]}" and bridge {wifi["is_bridge_member"]} '
+                f'at the same time!'))
 
     # use common function to verify VLAN configuration
     verify_vlan_config(wifi)
@@ -691,8 +706,10 @@ def apply(wifi):
         # Finally create the new interface
         w = WiFiIf(interface, **conf)
 
-        # assign/remove VRF
-        w.set_vrf(wifi['vrf'])
+        # assign/remove VRF (ONLY when not a member of a bridge,
+        # otherwise 'nomaster' removes it from it)
+        if not wifi['is_bridge_member']:
+            w.set_vrf(wifi['vrf'])
 
         # update interface description used e.g. within SNMP
         w.set_alias(wifi['description'])
diff --git a/src/conf_mode/interfaces-wirelessmodem.py b/src/conf_mode/interfaces-wirelessmodem.py
index a3a2a2648..975e21d9f 100755
--- a/src/conf_mode/interfaces-wirelessmodem.py
+++ b/src/conf_mode/interfaces-wirelessmodem.py
@@ -21,9 +21,10 @@ from copy import deepcopy
 from netifaces import interfaces
 
 from vyos.config import Config
+from vyos.ifconfig import BridgeIf, Section
 from vyos.template import render
 from vyos.util import chown, chmod_755, cmd, call
-from vyos.validate import is_bridge_member
+from vyos.validate import is_member
 from vyos import ConfigError
 
 default_config_data = {
@@ -64,11 +65,12 @@ def get_config():
     wwan['logfile'] = f"/var/log/vyatta/ppp_{wwan['intf']}.log"
     wwan['chat_script'] = f"/etc/ppp/peers/chat.{wwan['intf']}"
 
+    # check if interface is member if a bridge
+    wwan['is_bridge_member'] = is_member(conf, wwan['intf'], 'bridge')
+
     # Check if interface has been removed
     if not conf.exists('interfaces wirelessmodem ' + wwan['intf']):
         wwan['deleted'] = True
-        # check if interface is member if a bridge
-        wwan['is_bridge_member'] = is_bridge_member(conf, wwan['intf'])
         return wwan
 
     # set new configuration level
@@ -119,9 +121,9 @@ def get_config():
 def verify(wwan):
     if wwan['deleted']:
         if wwan['is_bridge_member']:
-            interface = wwan['intf']
-            bridge = wwan['is_bridge_member']
-            raise ConfigError(f'Interface "{interface}" can not be deleted as it belongs to bridge "{bridge}"!')
+            raise ConfigError((
+                f'Cannot delete interface "{wwan["intf"]}" as it is a '
+                f'member of bridge "{wwan["is_bridge_member"]}"!'))
 
         return None
 
@@ -133,9 +135,20 @@ def verify(wwan):
     if not os.path.exists(f"/dev/{wwan['device']}"):
         raise ConfigError(f"Device {wwan['device']} does not exist")
 
-    vrf_name = wwan['vrf']
-    if vrf_name and vrf_name not in interfaces():
-        raise ConfigError(f'VRF {vrf_name} does not exist')
+    if wwan['is_bridge_member'] and wwan['address']:
+        raise ConfigError((
+            f'Cannot assign address to interface "{wwan["intf"]}" '
+            f'as it is a member of bridge "{wwan["is_bridge_member"]}"!'))
+
+    if wwan['vrf']:
+        if wwan['vrf'] not in interfaces():
+            raise ConfigError(f'VRF "{wwan["vrf"]}" does not exist')
+
+        if wwan['is_bridge_member']:
+            raise ConfigError((
+                f'Interface "{wwan["intf"]}" cannot be member of VRF '
+                f'"{wwan["vrf"]}" and bridge {wwan["is_bridge_member"]} '
+                f'at the same time!'))
 
     return None
 
@@ -193,6 +206,12 @@ def apply(wwan):
         # make logfile owned by root / vyattacfg
         chown(wwan['logfile'], 'root', 'vyattacfg')
 
+        # re-add ourselves to any bridge we might have fallen out of
+        # FIXME: wwan isn't under vyos.ifconfig so we can't call
+        # Interfaces.add_to_bridge() so STP settings won't get applied
+        if wwan['is_bridge_member'] in Section.interfaces('bridge'):
+            BridgeIf(wwan['is_bridge_member'], create=False).add_port(wwan['intf'])
+
     return None
 
 if __name__ == '__main__':