This example illustrates an edge router at a peering point.
The edge router that is located in the network where the service provider exchanges routes with other service providers is also a suitable place to use peer groups. From the edge router, the service provider AS can peer with a large number of other service providers.
All peering autonomous systems should receive the same set of routes, namely the routes local to the service provider AS and the routes that are received from customer autonomous systems. Also, all routes that are received by the service provider peering router from all peering autonomous systems are processed almost identically. The characteristic of the exchange network is the same regardless of which neighbor the routes are received from. If the peering point is an FDDI, ATM, Gigabit Ethernet, or Dynamic Packet Transport (DPT) network, the preference of using the network for packet exchange may be different. However, for each single peering point, all neighbors are reachable over the same network, and the preference is quite likely to be the same.
Additionally, a number of other parameters could be the same, such as removing private AS numbers and limiting the number of routes received. In these cases, the network administrator can apply these parameters on the peer group template before the actual IP addresses of the neighbors are bound to the peer group.
© 2005, Cisco Systems, Inc. Optimizing BGP Scalability 7-39
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