BGP peer-group

It's a simple concept, just a group of neighbors we want to configure with the same group of parameters. It's defined in 3 steps:

1. Define/Configure the Peer Group

 (config-router)#neighbor CISQUEROS peer-group 

2. Add the individual neighbors into the configured peer group

 (config-router)#neighbor 2.2.2.2 peer-group CISQUEROS
 (config-router)#NEIghbor 3.3.3.3 PEER-group CISQUEROS

Expect the following message:

*May  5 10:13:21.395: %BGP_SESSION-5-ADJCHANGE: neighbor 3.3.3.3 IPv4 Unicast topology base removed from session  Member added to peergroup
*May  5 10:13:21.395: %BGP-5-ADJCHANGE: neighbor 3.3.3.3 Down Member added to peergroup
*May  5 10:13:22.283: %BGP-5-ADJCHANGE: neighbor 3.3.3.3 Up 

Both neighbors remain UP!

3. Apply the set of parameters to the Peer Group, and the parameters will apply to each of the Peers. For example, lets configure the Password:

 (config-router)#neighbor CISQUEROS password cisco