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.. _bgp:
BGP
---
:abbr:`BGP` stands for Border Gateway Protocol. The latest BGP version is 4.
BGP-4 is one of the Exterior Gateway Protocols and the de facto standard
interdomain routing protocol. BGP-4 is described in :rfc:`1771` and updated by
:rfc:`4271`. :rfc:`2858` adds multiprotocol support to BGP-4.
IPv4
^^^^
A simple eBGP configuration:
**Node 1:**
.. code-block:: sh
set protocols bgp 65534 neighbor 192.168.0.2 ebgp-multihop '2'
set protocols bgp 65534 neighbor 192.168.0.2 remote-as '65535'
set protocols bgp 65534 neighbor 192.168.0.2 update-source '192.168.0.1'
set protocols bgp 65534 address-family ipv4-unicast network '172.16.0.0/16'
set protocols bgp 65534 parameters router-id '192.168.0.1'
**Node 2:**
.. code-block:: sh
set protocols bgp 65535 neighbor 192.168.0.1 ebgp-multihop '2'
set protocols bgp 65535 neighbor 192.168.0.1 remote-as '65534'
set protocols bgp 65535 neighbor 192.168.0.1 update-source '192.168.0.2'
set protocols bgp 65535 address-family ipv4-unicast network '172.17.0.0/16'
set protocols bgp 65535 parameters router-id '192.168.0.2'
Don't forget, the CIDR declared in the network statement MUST **exist in your
routing table (dynamic or static), the best way to make sure that is true is
creating a static route:**
**Node 1:**
.. code-block:: sh
set protocols static route 172.16.0.0/16 blackhole distance '254'
**Node 2:**
.. code-block:: sh
set protocols static route 172.17.0.0/16 blackhole distance '254'
IPv6
^^^^
A simple BGP configuration via IPv6.
**Node 1:**
.. code-block:: sh
set protocols bgp 65534 neighbor 2001:db8::2 ebgp-multihop '2'
set protocols bgp 65534 neighbor 2001:db8::2 remote-as '65535'
set protocols bgp 65534 neighbor 2001:db8::2 update-source '2001:db8::1'
set protocols bgp 65534 neighbor 2001:db8::2 address-family ipv6-unicast
set protocols bgp 65534 address-family ipv6-unicast network '2001:db8:1::/48'
set protocols bgp 65534 parameters router-id '10.1.1.1'
**Node 2:**
.. code-block:: sh
set protocols bgp 65535 neighbor 2001:db8::1 ebgp-multihop '2'
set protocols bgp 65535 neighbor 2001:db8::1 remote-as '65534'
set protocols bgp 65535 neighbor 2001:db8::1 update-source '2001:db8::2'
set protocols bgp 65535 neighbor 2001:db8::1 address-family ipv6-unicast
set protocols bgp 65535 address-family ipv6-unicast network '2001:db8:2::/48'
set protocols bgp 65535 parameters router-id '10.1.1.2'
Don't forget, the CIDR declared in the network statement **MUST exist in your
routing table (dynamic or static), the best way to make sure that is true is
creating a static route:**
**Node 1:**
.. code-block:: sh
set protocols static route6 2001:db8:1::/48 blackhole distance '254'
**Node 2:**
.. code-block:: sh
set protocols static route6 2001:db8:2::/48 blackhole distance '254'
Route Filter
^^^^^^^^^^^^
Route filter can be applied using a route-map:
**Node1:**
.. code-block:: sh
set policy prefix-list AS65535-IN rule 10 action 'permit'
set policy prefix-list AS65535-IN rule 10 prefix '172.16.0.0/16'
set policy prefix-list AS65535-OUT rule 10 action 'deny'
set policy prefix-list AS65535-OUT rule 10 prefix '172.16.0.0/16'
set policy prefix-list6 AS65535-IN rule 10 action 'permit'
set policy prefix-list6 AS65535-IN rule 10 prefix '2001:db8:2::/48'
set policy prefix-list6 AS65535-OUT rule 10 action 'deny'
set policy prefix-list6 AS65535-OUT rule 10 prefix '2001:db8:2::/48'
set policy route-map AS65535-IN rule 10 action 'permit'
set policy route-map AS65535-IN rule 10 match ip address prefix-list 'AS65535-IN'
set policy route-map AS65535-IN rule 10 match ipv6 address prefix-list 'AS65535-IN'
set policy route-map AS65535-IN rule 20 action 'deny'
set policy route-map AS65535-OUT rule 10 action 'deny'
set policy route-map AS65535-OUT rule 10 match ip address prefix-list 'AS65535-OUT'
set policy route-map AS65535-OUT rule 10 match ipv6 address prefix-list 'AS65535-OUT'
set policy route-map AS65535-OUT rule 20 action 'permit'
set protocols bgp 65534 neighbor 2001:db8::2 route-map export 'AS65535-OUT'
set protocols bgp 65534 neighbor 2001:db8::2 route-map import 'AS65535-IN'
**Node2:**
.. code-block:: sh
set policy prefix-list AS65534-IN rule 10 action 'permit'
set policy prefix-list AS65534-IN rule 10 prefix '172.17.0.0/16'
set policy prefix-list AS65534-OUT rule 10 action 'deny'
set policy prefix-list AS65534-OUT rule 10 prefix '172.17.0.0/16'
set policy prefix-list6 AS65534-IN rule 10 action 'permit'
set policy prefix-list6 AS65534-IN rule 10 prefix '2001:db8:1::/48'
set policy prefix-list6 AS65534-OUT rule 10 action 'deny'
set policy prefix-list6 AS65534-OUT rule 10 prefix '2001:db8:1::/48'
set policy route-map AS65534-IN rule 10 action 'permit'
set policy route-map AS65534-IN rule 10 match ip address prefix-list 'AS65534-IN'
set policy route-map AS65534-IN rule 10 match ipv6 address prefix-list 'AS65534-IN'
set policy route-map AS65534-IN rule 20 action 'deny'
set policy route-map AS65534-OUT rule 10 action 'deny'
set policy route-map AS65534-OUT rule 10 match ip address prefix-list 'AS65534-OUT'
set policy route-map AS65534-OUT rule 10 match ipv6 address prefix-list 'AS65534-OUT'
set policy route-map AS65534-OUT rule 20 action 'permit'
set protocols bgp 65535 neighbor 2001:db8::1 route-map export 'AS65534-OUT'
set protocols bgp 65535 neighbor 2001:db8::1 route-map import 'AS65534-IN'
We could expand on this and also deny link local and multicast in the rule 20
action deny.
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