HP 4800G Series Configuration Manual page 573

A router that is neither a route reflector nor a client is a non-client, which has to establish BGP sessions
to the route reflector and other non-clients, as shown below.
Figure 1-13 Network diagram for route reflector
The route reflector and clients form a cluster. In some cases, you can configure more than one route
reflector in a cluster to improve network reliability and prevent single point failure, as shown in the
following figure. The configured route reflectors must have the same Cluster_ID to avoid routing loops.
Figure 1-14 Network diagram for route reflectors
Route reflector1 Route reflector2
IBGP
Cluster
IBGP IBGP
IBGP
Client
Client Client
AS 65000
When the BGP routers in an AS are fully meshed, route reflection is unnecessary because it consumes
more bandwidth resources. You can use related commands to disable route reflection in this case.
After route reflection is disabled between clients, routes can still be reflected between a client and a
non-client.
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