HP 6125XLG R2306-HP 6125XLG Blade Switch Layer 3 - IP Routing Configuration Gu - Page 177
Cluster_ID to avoid routing loops.
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IBGP peers must be fully meshed to maintain connectivity. If n routers exist in an AS, the number of IBGP connections is n(n-1)/2. If a large number of IBGP peers exist, large amounts of network and CPU resources are consumed to maintain sessions. Using route reflectors can solve this issue. In an AS, a router acts as a route reflector, and other routers act as clients connecting to the route reflector. The route reflector forwards routing information received from a client to other clients. In this way, all clients can receive routing information from one another without establishing BGP sessions. A router that is neither a route reflector nor a client is a non-client, which, as shown in Figure 50, must establish BGP sessions to the route reflector and other non-clients. Figure 50 Network diagram for a route reflector 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 Figure 51. The configured route reflectors must have the same Cluster_ID to avoid routing loops. Figure 51 Network diagram for route reflectors 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. 166
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