HPE FlexNetwork HSR6800 Configuration Manual page 204

Figure 65 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
the same Cluster_ID to avoid routing loops.
Figure 66 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.
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Confederation
Confederation is another method to manage growing IBGP connections in an AS. It splits an AS
into multiple sub ASs. In each sub AS, IBGP peers are fully meshed. As shown in
intra-confederation EBGP connections are established between sub Ass in AS 200.
Figure 66. The configured route reflectors must have
192
Figure 67,