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Routing TCP/IP, Volume I (CCIE Professional Development) by Jeff Doyle

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Basic Uses of Route Maps

Route maps can be used for both redistribution and for policy routing. They are also used frequently in large-scale Border Gateway Protocol (BGP) implementations. Although redistribution has been covered extensively in previous chapters, this chapter introduces the topic of policy routing.

Policy routes are nothing more than sophisticated static routes. Whereas static routes forward a packet to a specified next hop based on the destination address of the packet, policy routes forward a packet to a specified next hop based on the source of the packet. Policy routes can also be linked to extended IP access lists so that routing may be based on such things as protocol types and port numbers. Like a static route, a policy ...

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