Which command enables fast-switched PBR?
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A. B. C. D.A.
Policy-based routing (PBR) is a mechanism that allows you to selectively route packets based on policies defined by you. Fast-switched PBR refers to the use of the fast-switched path for policy-based routing.
The correct command to enable fast-switched PBR is option A, ip route-cache policy.
Here's a detailed explanation of each answer option:
A. ip route-cache policy: This command enables fast-switched PBR. When you use PBR with this command, the router caches the result of the route lookup in the fast-switching cache. This caching speeds up the processing of subsequent packets that match the same policy.
B. ip policy route-map map-tag: This command enables PBR, but it does not enable fast-switched PBR. When you use PBR with this command, the router performs the route lookup in the main routing table, rather than in the fast-switching cache.
C. no ip route-cache policy: This command disables fast-switched PBR. If you have previously enabled fast-switched PBR, you can use this command to disable it.
D. no ip policy route-map map-tag: This command disables PBR altogether. If you have previously enabled PBR with the ip policy route-map command, you can use this command to disable it.
In summary, to enable fast-switched PBR, use the ip route-cache policy command on the interface where you want to apply the policy.