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Configuring BGP4
Adding a BGP4 Peer Group
A peer group is a set of BGP4 neighbors that share common parameters. Peer groups provide the following
benefits:
• Simplified neighbor configuration – You can configure a set of neighbor parameters and then apply them to
multiple neighbors. You do not need to individually configure the common parameters individually on each
neighbor.
• Flash memory conservation – Using peer groups instead of individually configuring all the parameters for
each neighbor requires fewer configuration commands in the startup-config file.
You can perform the following tasks on a peer-group basis.
• Reset neighbor sessions
• Perform soft-outbound resets (the routing switch updates outgoing route information to neighbors but does
not entirely reset the sessions with those neighbors)
• Clear BGP message statistics
• Clear error buffers
Peer Group Parameters
You can set all neighbor parameters in a peer group. When you add a neighbor to the peer group, the neighbor
receives all the parameter settings you set in the group, except parameter values you have explicitly configured
for the neighbor. If you do not set a neighbor parameter in the peer group and the parameter also is not set for the
individual neighbor, the neighbor uses the default value.
You can set the following neighbor parameters using a peer group:
• Advertisement interval
• Default-information-originate
• Description
• Distribute list
• EBGP multihop
• Filter list
• Maximum prefix
• Next-hop-self
• Password
• Prefix-list
• Remote AS
• Remove private AS
• Route map
• Route reflector client
• Send community
• Shutdown
• Timers
• Update source
• Weight
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