Figure presents a policy routing scenario. A route map can be used at RTA to implement policy routing. Assume for this example that the policy to be enforced is as follows:

• Route Internet-bound traffic from 192.168.1.0/24 to ISP1
• Route Internet-bound traffic from 172.16.1.0/24 to ISP2

First, define the access lists that will be used in the route maps to match IP addresses. Then configure the route map itself using the syntax shown in Figure .

The commands in Figure have actually configured two policies. The ISP1 route map matches access list 1 and routes traffic out S0  toward ISP1. The ISP2 route map matches access list 2 and routes that traffic out S1 toward ISP2.

The final step is to apply each route map to the appropriate interface on RTA using the ip policy route-map command. With the route maps applied to the appropriate LAN interfaces, policy routing is successfully implemented.

Frequently, route maps are used to control the exchange of routing information during redistribution. Route redistribution is detailed in the next section.

Lab Activity e-Lab Activity: Policy Routing This lab is to use a route map at RTA to implement policy routing.

    

Web Links Understanding Policy Routing http://www.cisco.com/warp/public/105/36.html