This topic identifies various routing schemes that customers use to connect to a service provider.
Different solutions for connecting a customer network to the network of an ISP require different methods of routing information exchange:
■ Static routing: Static routing is preferred because of its lower complexity. In a normal case, the customer network must have a default route to the ISP network and the ISP network must have a route to the IP prefixes that the customer has in its network. As always, static routing provides very low, if any, redundancy.
■ Dynamic routing: Dynamic routing provides redundancy. The customer and the ISP networks must be configured to exchange a common routing protocol. BGP is the only choice because of the large volumes of routing information, the inherent security mechanisms of BGP, and the ability of BGP to handle routing policies.
5-10 Configuring BGP on Cisco Routers (BGP) v3.2 © 2005, Cisco Systems, Inc.
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