Configure Route Reflector For Bgp - Cisco NCS 5500 Series Configuration Manual

Implementing BGP
BGP Route Reflectors
In Figure 1: Simple BGP Model with a Route Reflector, on page 44 , Router B is configured as a route
reflector. When the route reflector receives routes advertised from Router A, it advertises them to Router C,
and vice versa. This scheme eliminates the need for the iBGP session between routers A and C.
Figure 1: Simple BGP Model with a Route Reflector
See BGP Route Reflectors Reference, on page 138 for additional details on route reflectors.

Configure Route Reflector for BGP

Perform this task to configure a route reflector for BGP.
All the neighbors configured with the route-reflector-clientcommand are members of the client group, and
the remaining iBGP peers are members of the nonclient group for the local route reflector.
Together, a route reflector and its clients form a cluster. A cluster of clients usually has a single route reflector.
In such instances, the cluster is identified by the software as the router ID of the route reflector. To increase
redundancy and avoid a single point of failure in the network, a cluster can have more than one route reflector.
If it does, all route reflectors in the cluster must be configured with the same 4-byte cluster ID so that a route
reflector can recognize updates from route reflectors in the same cluster. The bgp cluster-id command is used
to configure the cluster ID when the cluster has more than one route reflector.
BGP Configuration Guide for Cisco NCS 5500 Series Routers, IOS XR Release 6.2.x
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