IP Forwarding: Process Switching

Process switching is the act of a router taking a received frame and processing it through the CPU of the router to collect and learn next hop information, and cache that information for subsequent packets.  This can be extremely CPU intensive if packets are destined to a wide range of IP addresses the CPU has not yet learned about and cached.  Process switching is needed in some instances such as Fast switching however overall it is considered to be the least desired method of processing packets there is given the alternate cached methods available.

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