Configuring Peer GroupsTo configure multiple BGP neighbors at one time, create and populate a BGP peer group.An advantage of peer groups is that members of a peer group inherit the configuration properties of thegroup and share same update policy.A maximum of 256 peer groups are allowed on the system.Create a peer group by assigning it a name, then adding members to the peer group. After you create apeer group, you can configure route policies for it. For information about configuring route policies for apeer group, refer to Filtering BGP Routes.NOTE: Sample Configurations for enabling peer groups are found at the end of this chapter.1. Create a peer group by assigning a name to it.CONFIG-ROUTERBGP modeneighbor peer-group-name peer-group2. Enable the peer group.CONFIG-ROUTERBGP modeneighbor peer-group-name no shutdownBy default, all peer groups are disabled.3. Create a BGP neighbor.CONFIG-ROUTERBGP modeneighbor ip-address remote-as as-number4. Enable the neighbor.CONFIG-ROUTERBGP modeneighbor ip-address no shutdown5. Add an enabled neighbor to the peer group.CONFIG-ROUTERBGP modeneighbor ip-address peer-group peer-group-name6. Add a neighbor as a remote AS.CONFIG-ROUTERBGP modeneighbor {ip-address | peer-group name} remote-as as-numberFormats: IP Address A.B.C.D• Peer-Group Name: 16 characters.• as-number: the range is from 0 to 65535 (2-Byte) or 1 to 4294967295 | 0.1 to 65535.65535 (4-Byte) or 0.1 to 65535.65535 (Dotted format)To add an external BGP (EBGP) neighbor, configure the as-number parameter with a numberdifferent from the BGP as-number configured in the router bgp as-number command.Border Gateway Protocol IPv4 (BGPv4) 181
