29.5.1 BGP4 + peer group configuration

(1) List of configuration commands

The following tables list the commands used to configure BGP4 + peer groups.

Table 29-9: List of configuration commands

Command name	Description
neighbor peer-group (assigning members)	Assigns a peer to a peer group.
neighbor peer-group (creating)	Creates a peer group.

(2) Configuring BGP4 + Peer Groups

Points to note

The example below shows how to create a peer group by using the neighbor peer-group (creating) command. Settings such as the AS number, optional settings, and advertising filters apply to all peers in the peer group.

Command examples

1. (config)# router bgp 65531

   (config-router)# bgp router-id 172.16.2.100

   (config-router)# neighbor INTERNAL-GROUP peer-group

   Creates a peer group (group identifier: INTERNAL-GROUP) using the neighbor peer-group (creating) command.

2. (config-router)# neighbor INTERNAL-GROUP remote-as 65531

   (config-router)# address-family ipv6

   (config-router-af)# neighbor INTERNAL-GROUP soft-reconfiguration inbound

   (config-router-af)# exit

   (config-router)# neighbor INTERNAL-GROUP timers 30 90

   Sets the AS number (AS:65531) and optional settings for the peer group (group identifier: INTERNAL-GROUP) .

3. (config-router)# neighbor EXTERNAL-GROUP peer-group

   (config-router)# address-family ipv6

   (config-router-af)# neighbor EXTERNAL-GROUP activate

   (config-router-af)# neighbor EXTERNAL-GROUP send-community

   (config-router-af)# top

   Creates a peer group (group identifier: EXTERNAL-GROUP) using the neighbor peer-group (creating) command, and performs optional settings.

4. (config)# route-map SET_COM permit 10

   (config-route-map)# set community 1000:1001

   (config-route-map)# exit

   Sets the community value 1000:1001 for the specified route-map.

5. (config)# router bgp 65531

   (config-router)# address-family ipv6

   (config-router-af)# neighbor EXTERNAL-GROUP route-map SET_COM out

   (config-router-af)# exit

   Sets an advertised route filter for the peer group (group identifier: EXTERNAL-GROUP).

(3) Settings for assigning BGP4 + peers to peer groups

Points to note

The example below shows how to assign a peer to a peer group by using the neighbor peer-group (assigning members) command.

Command examples

1. (config-router)# neighbor 3ffe:172:16:2::2 peer-group INTERNAL-GROUP

   Assigns a peer (remote peer address: 3ffe:172:16:2::2) to the peer group (group identifier: INTERNAL-GROUP) by using the neighbor peer-group (assigning members) command. The AS number 65531 set for the peer group will be used for the peer's AS number.

2. (config-router)# neighbor 3ffe:172:17:3::3 peer-group INTERNAL-GROUP

   Neighbor peer-group(assigning members) Use the command to assign a peer (remote peer address:3ffe:172:17:3::3) to a peer group (group identifier:INTERNAL-GROUP). The AS number 65531 set for the peer group will be used for the peer's AS number.

3. (config-router)# neighbor 3ffe:192:168:4::4 remote-as 65533

   (config-router)# neighbor 3ffe:192:168:4::4 peer-group EXTERNAL-GROUP

   Creates a peer (remote peer address: 3ffe:192:168:4::4) and assigns it to a peer group (group identifier: EXTERNAL-GROUP). The AS number 65533 set for the peer will be used as its AS number.

4. (config-router)# neighbor 3ffe:192:168:5::5 remote-as 65534

   (config-router)# neighbor 3ffe:192:168:5::5 peer-group EXTERNAL-GROUP

   Sets a peer (remote peer address:3ffe:192:168:5::5) and assigns it to a peer group (group identifier:EXTERNAL-GROUP). AS number of the peer uses the 65534 specified for the peer.