Policy Routing

This section demonstrates how policy routing can be used to direct the traffic based on the source IP address rather than the destination IP address. Figure 12-12 shows a router, RTA, that is running BGP with two providers, AS1 and AS2. Internal routers such as RTG and RTF are running IGP only (OSPF) and are following a default route toward RTA.

Figure 12-12. Policy Routing Scenario

RTA wants to set policy routing in such a way that traffic coming over the serial line S1 from RTG is directed toward AS2 if the source is network Traffic coming from RTG with source is to be directed toward AS1; ...

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