Policy Routing Based on Traffic Source
Consider the example shown in Figure 8-6. Assume that AS1 was assigned network numbers from two different providers. The 10.10.10.0/24 range was taken from AS3, and the 11.11.11.0/24 range was taken from AS4. AS1 wants to have any traffic originated from its 10.10.10.0/24 networks to be directed toward AS3 and traffic from its 11.11.11.0/24 networks to be directed to AS4, irrespective of the traffic's final destination. AS1 could use policy routing to achieve this requirement by forcing all traffic with a source IP address belonging to 10.10.10.0/24 to have a next hop of 1.1.1.1 and traffic with a source IP belonging to 11.11.11.0/24 to have a next hop of 2.2.2.2.
Figure 8-6. Policy Routing Scenario Based on Source
Figure 8-6. Policy Routing Scenario Based on Source
