In order to simplify the configuration of multiple similar peer sessions, “peer groups” are available. Configuring a peer group is the same as configuring an individual BGP peer. The peer group configuration applies to all members of the peer group.

A neighbor can be associated with a single peer group although it can selectively inherit the properties of the given peer group per address family.

Depending on the IP address family type of the peer group, peers are added to a peer group by using protocols bgp <asn> neighbor <id> address-family ipv4-unicast peer-group <group-name> or protocols bgp <asn> neighbor <id> address-family ipv6-unicast peer-group <group-name>.

If the neighbor is associated under an IPv4 address family and an IPv6 address family by using protocols bgp <asn> neighbor <id> address-family ipv4-unicast peer-group <group-name> and protocols bgp <asn> neighbor <id> address-family ipv6-unicast peer-group <group-name>, then all of the following applies:

• Global or address-family agnostic configurations of the peer group are applied to the neighbor.
• IPv4 address-family specific configurations of the peer group are applied to the neighbor.
• IPv6 address-family specific configurations of the peer group are applied to the neighbor.

If the neighbor is associated under an IPv4 address family and not an IPv6 address family (using protocols bgp <asn> neighbor <id> address-family ipv4-unicast peer-group <group-name>), then the following applies:

• Global or address-family agnostic configurations of the peer group are applied to the neighbor and IPv4 address-family specific configurations of the peer group are applied to the neighbor.
• The IPv6 address-family specific configurations of the peer group are not applied to the neighbor.

If the neighbor is associated under an IPv6 address family and not an IPv4 address family (using protocols bgp <asn> neighbor <id> address-family ipv6-unicast peer-group <group-name>), then the following applies:

• Global or address-family agnostic configurations of the peer group are applied to the neighbor and IPv6 address-family specific configurations of the peer group are applied to the neighbor.
• The IPv4 address-family specific configurations of the peer group are not applied to the neighbor.