378 CHAPTER 30: BGP CONFIGURATION
Figure 128 Network diagram for route reflectors
When clients of a route reflector are fully meshed, route reflection is unnecessary
because it consumes more bandwidth resources. The system supports using
related commands to disable route reflection in this case.
n
After route reflection is disabled between clients, routes between a client and a
non-client can still be reflected.
Confederation
Confederation is another method to deal with growing IBGP connections in ASs. It
splits an AS into multiple sub-ASs. In each sub-AS, IBGP peers are fully meshed,
and EBGP connections are established between sub-ASs, as shown below:
Figure 129 Confederation network diagram
From the perspective of a non-confederation speaker, it needs not know sub-ASs
in the confederation. The ID of the confederation is the number of the AS. In the
above figure, AS200 is the confederation ID.
Route
Reflector1
Route
Reflector2
Client Client
Client
IBGP IBGP
IBGP
Cluster
IBGP
AS 65000
AS 100
EBGP
IBGP
IBGP
IBGP
EBGP
EBGP
AS 65002 AS 65003
AS 65004
AS 200
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