Users Guide

● You must create a peer group first before adding the neighbors in the peer group.
● If you remove any configuration parameters from a peer group, it will apply to all the neighbors configured under that peer
group.
● If you have not configured a parameter for an individual neighbor in the peer group, the neighbor uses the value configured in
the peer group.
● If you reset any parameter for an individual neighbor, it will override the value set in the peer group.
● If you add a configuration parameters to a peer group that already has neighbors, the parameter value is applied to all the
neighbors which does not have the value set. If a neighbor has a value explicitly set, the value overrides the value set for the
peer group.
●
You cannot remove the remote AS configuration from the peer group, if the peer group has neighbors.
● If you remove any parameter value in a peer group, the value of the parameter is set to the default for all the neighbors in
the peer group, unless there is an explicit parameter set for an individual neighbor.
After you create a peer group, you can configure route policies for it. For information about configuring route policies for a peer
group, refer to Filtering BGP Routes. See Example-Configuring BGP peer groups for configuring multiple BGP neighbors and
enabling peer groups.
Configuring Peer Groups
To configure a peer group, use the following commands.
1. Enter the router configuration mode and the AS number.
CONFIG mode
router bgp as-number
2. Create a peer group by assigning a name to it.
CONFIG-ROUTER-BGP mode
neighbor peer-group-name peer-group
3. Enable the peer group.
CONFIG-ROUTER-BGP mode
neighbor peer-group-name no shutdown
By default, all peer groups are disabled.
4. Create a BGP neighbor.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6-address} remote-as as-number
5. Enable the neighbor.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6-address} no shutdown
NOTE: You can use neighbor shutdown command to disable a BGP neighbor or a peer group.
6. Add an enabled neighbor to the peer group.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6-address | peer-group-name} peer-group peer-group-name
7. Add a neighbor as a remote AS.
CONFIG-ROUTER-BGP mode
neighbor {ip-address | ipv6-address | peer-group-name} remote-as as-number
● 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 number different from the BGP
as-number configured in the router bgp as-number command.
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Border Gateway Protocol (BGP)