Configuring a peer group with IPv4 and IPv6 peers

A peer group that contains both IPv4 and IPv6 peers can be configured.
  1. Enter the configure terminal command to access global configuration mode.
    device# configure terminal
  2. Enter the router bgp command to enable BGP routing.
    device(config)# router bgp
  3. Enter the local-as command to configure the autonomous system number (ASN) in which your device resides.
    device(config-bgp-router)# local-as 1000
  4. Enter the neighbor peer-group command, specifying a peer group, to create a peer group.
    device(config-bgp-router)# neighbor p1 peer-group 
  5. Enter the neighbor remote-as command to specify the ASN of the peer group.
    device(config-bgp-router)# neighbor p1 remote-as 11
  6. Enter the neighbor peer-group command, specifying an IPv6 address, to associate a neighbor with the peer group.
    device(config-bgp-router)# neighbor 2001:2018:8192::124 peer-group p1
  7. Enter the neighbor peer-group command, specifying a different IPv6 address, to associate another neighbor with the peer group.
    device(config-bgp-router)# neighbor 10.0.0.1 peer-group p1
  8. Enter the address-family ipv6 unicast command to enter IPv6 address family configuration mode.
    device(config-bgp-router)# address-family ipv6 unicast
  9. Enter the neighbor activate command to establish an IPv6 BGP session with the peer group.
    device(config-bgp-ipv6u)# neighbor p1 activate

The following example creates a peer group with both IPv6 and IPv4 peers and activates the peer group in the IPv6 address family.

device# configure terminal
device(config)# router bgp
device(config-bgp-router)# local-as 1000
device(config-bgp-router)# neighbor p1 peer-group
device(config-bgp-router)# neighbor p1 remote-as 11
device(config-bgp-router)# neighbor 2001:2018:8192::124 peer-group p1
device(config-bgp-router)# neighbor 10.0.0.1 peer-group p1
device(config-bgp-router)# address-family ipv6 unicast
device(config-bgp-ipv6u)# neighbor p1 activate