3Com Switch 7700 Configuration Manual page 172

164 C 5: IP R
HAPTER OUTING
P O
ROTOCOL PERATION
can have multiple clients. Each client, in turn, can be a route reflector with
multiple clients.
In the following figure, Router A receives an update packet from the external peer
and transmits it to Router C. Router C is a route reflector with two peer clients:
Router A and Router B.
Router C reflects the update packet from client Router A to client Router B. In this
configuration, the peer session between Router A and Router B is actually
eliminated because the route reflector will transfer the BGP information to Router
B.
Figure 12 Route Reflector Diagram
Route reflector Route reflector
Route updated Route updated
EBGP EBGP Router A Router A
The reflector is the router that can complete the route reflection function. The
route reflector regards the IBGP peers as client and non-client. All peers that do
not belong to this cluster in the autonomous system are the non-clients. The
designation of route reflector and the addition of the client peer are implemented
with the peer reflect-client command.
Configuring the Route Reflection Between Clients
Perform the following configurations in BGP view..
Table 123 Configuring the Route Reflection Between Clients
Operation
Enable route reflection between clients
Disable route reflection between clients
By default, route reflection between clients is enabled.
Configuring the Cluster ID
Generally, there is only one route reflector in a cluster.
Perform the following configurations in BGP view..
Table 124 Configuring the Cluster ID
Operation
Configure the Cluster_ID of the route reflector reflector cluster-id { cluster-id | address }
Router C Router C
Route reflected Route reflected
Router Router
Router B Router B
Command
reflect between-clients
undo reflect between-clients
Command
EBGP EBGP