■ Propagation of Communities
■ Source Interface
To apply a consistent routing policy within the entire local AS, the network administrator needs to configure every IBGP session identically. If a router in the AS is supplied with some information, then all the routers should be supplied with the same information. Otherwise, an inconsistent routing policy within the AS might cause inconsistent routing or application of BGP policies.
The peer group function is a good tool to make sure that all IBGP peers receive the same configuration information. The network administrator configures a peer group template with the required parameters, such as the neighbor AS number, enabling of the send-community option, setting of the update source to a loopback interface, and router authentication mechanisms. Then all the internal neighbor IP addresses are bound to the peer group, and the peer group configuration is applied to all of them. This approach ensures a consistent routing policy within the AS.
In a service provider network, the routers that are assigned as route reflectors are the routers with the largest number of IBGP sessions. These are the routers where the peer group function is most useful.
7-38 Configuring BGP on Cisco Routers (BGP) v3.2
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