User Manual

BGP Configuration Examples
232 Enterasys X-Pedition User Reference Manual
Route Reflection Example
In some ISP networks, the internal BGP mesh becomes quite large, and the IBGP full mesh does
not scale well. For such situations, route reflection provides a way to alleviate the need for a full
IBGP mesh. In route reflection, the clients peer with the route reflector and exchange routing
information with it. In turn, the route reflector passes on (reflects) information between clients.
The IBGP peers of the route reflector fall under two categories: clients and non-clients. A route
reflector and its clients form a cluster. All peers of the route reflector that are not part of the cluster
are non-clients. The X-Pedition supports client peers as well as non-client peers of a route reflector.
Figure 20 shows a sample configuration that uses route reflection.
Figure 20. Sample BGP Configuration (Route Reflection)
AS-64902
AS-64900
X-Pedit
X-Pedi
X-PeditiX-Pediti
X-Pedi
X-Pediti
AS-64901
IBGP
Cluster
Client
IBGP
Cluster
Client
IBGP
Non-Cluster
Client
IBGP
Cluster
Client
EBGP
Peer
EBGP
Peer
X-Pediti
192.68.222.1
192.68.20.2
192.68.20.1
172.16.30.2