R21xx-HP FlexFabric 11900 Layer 3 IP Routing Configuration Guide

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A router that is neither a route reflector nor a client is a non-client, which, as shown in Figure 50,
must establish BGP sessions to the route reflector and other non-clients.
Figure 50 Network diagram for a route reflector
The route reflector and clients form a cluster. Typically a cluster has one route reflector. The ID of
the route reflector is the Cluster_ID. You can configure more than one route reflector in a cluster to
improve availability, as shown in Figure 51. The confi
gured route reflectors must have the same
Cluster_ID to avoid routing loops.
Figure 51 Network diagram for route reflectors
When the BGP routers in an AS are fully meshed, route reflection is unnecessary because it
consumes more bandwidth resources. You can use commands to disable route reflection instead of
modifying network configuration or changing network topology.
After route reflection is disabled between clients, routes can still be reflected between a client and
a non-client.
• Confederation