IP policy routing can be fast-switched. Prior to fast-switched policy routing, policy routing could only be process -switched, which meant that on most platforms, the switching rate was approximately 1000 to 10,000 packets per second. Such rates were not fast enough for many applications. With fast-switched policy routing, users who need policy routing to occur at faster speeds can implement policy routing without slowing down the device.
Fast-switched policy routing supports all match commands and most set commands, except for the following:
set ip default
The set interface command is supported only over point-to-point links, unless there is a route cache entry that uses the same interface that is specified in the command in the route map.
To configure fast-switched policy routing, use the ip route-cache policy interface configuration command.