HP HPE FlexNetwork 7500 series Configuration Manual page 215

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 58 Network diagram for route reflectors
Route reflector1
Cluster
IBGP
Client
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
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 59 Confederation network diagram
EBGP
AS 100
Route reflector2
IBGP
IBGP
Client
AS 65002
EBGP
IBGP
IBGP
AS 200
203
Figure 58. The configured route reflectors must have
IBGP
Client
AS 65000
AS 65003
EBGP
IBGP
AS 65004
Figure 59,