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232 | Border Gateway Protocol IPv4 (BGPv4)
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Configure Peer Groups
To configure multiple BGP neighbors at one time, create and populate a BGP peer group. Another
advantage of peer groups is that members of a peer groups inherit the configuration properties of the group
and share same update policy.
A maximum of 256 Peer Groups are allowed on the system.
You create a peer group by assigning it a name, then adding members to the peer group. Once a peer group
is created, you can configure route policies for it. Refer to Filter BGP routes for information on configuring
route policies for a peer group.
Use these commands in the following sequence starting in the CONFIGURATION ROUTER BGP mode
to create a peer group
After you create a peer group, you can use any of the commands beginning with the keyword
neighbor to
configure that peer group.
Note: Sample Configurations for enabling Peer Groups are found at the end of this chapter.
Step Command Syntax Command Mode Purpose
1 neighbor peer-group-name
peer-group
CONFIG-ROUTER-
BGP
Create a peer group by assigning a name to it.
2
neighbor peer-group-name
no shutdown
CONFIG-ROUTER-
BGP
Enable the peer group.
By default, all peer groups are disabled
3
neighbor ip-address remote-as
as-number
CONFIG-ROUTER-
BGP
Create a BGP neighbor.
4
neighbor ip-address no shutdown CONFIG-ROUTER-
BGP
Enable the neighbor.
5
neighbor ip-address peer-group
peer-group-name
CONFIG-ROUTER-
BGP
Add an enabled neighbor to the peer group.
6
neighbor {ip-address | peer-group
name
} remote-as as-number
CONFIG-ROUTER-
BGP
Add a neighbor as a remote AS.
Formats:
IP Address A.B.C.D
Peer-Group Name16 characters
AS-number: 0-65535 (2-Byte) or
1-4294967295 | 0.1- 65535.65535 (4-Byte) or
0.1-65535.65535 (Dotted format)
To add an external BGP (EBGP) neighbor, configure the as-number
parameter with a number different from the BGP as-number configured
in the router bgp as-number command.
To add an internal BGP (IBGP neighbor, configure the as-number
parameter with the same BGP
as-number configured in the router bgp
as-number command.