13.2.3 Configuring BGP4 Peering

Points to note

To configure a peer, first set the address and AS number on the remote side using the neighbor remote-as command, and then set other information about the peer.

Command examples

1. (config)# router bgp 65531

   Apply BGP4/BGP4+ to the routing protocol. Specify the AS number (65531) of the autonomous system to which the local router belongs for the parameter.

2. (config-router)# bgp router-id 192.168.1.100

   Sets the identifier of the local router (192.168.1.100).

3. (config-router)# neighbor 172.16.2.2 remote-as 65532

   Configures an external peer (remote peer address:172.16.2.2; AS number: 65532).

4. (config-router)# neighbor 10.2.2.2 remote-as 65533

   Configures an external peer (remote peer address:10.2.2.2; AS number: 65533).

5. (config-router)# neighbor 10.2.2.2 ebgp-multihop

   Disallows use of the interface address of the directly connected interface as the peering address.

6. (config-router)# neighbor 10.2.2.2 update-source loopback 0

   Sets the device address as the peering address of the local router.

7. (config-router)# neighbor 192.168.2.2 remote-as 65531

   Configures an internal peer (remote peer address: 192.168.2.2).

8. (config-router)# neighbor 10.1.2.2 remote-as 65531

   Configures an internal peer (remote peer address: 10.1.2.2).

9. (config-router)# neighbor 10.1.2.2 update-source loopback 0

   Sets the device address as the peering address of the local router.