Scalable Policy Routing

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By Ivan Pepelnjak

Common implementation of policy routing in Cisco IOS is performed within a single device and requires a complex configuration mix of access-lists and route-maps. In a larger network where you have to influence the end-to-end packet flow, the hop-by-hop method of the IOS policy routing clearly does not scale.

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Routing protocol-based policy routing

Server virtualization has allowed us to dedicate virtual servers (and, consequently, specific IP addresses) to individual applications, and distance-vector routing protocols (or MPLS Traffic Engineering) help you provision alternate paths for specific IP prefixes. You could influence route selection for individual prefixes with EIGRP (using the per-interface or per-neighbor offset-list), but it’s much better if you could deploy BGP due to its support for a rich set of path attributes.

Sample policy routing with BGP

Read more in the Scalable Policy Routing IP Corner article

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