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network cisco ccna gns3 certification arteq

network cisco ccna gns3 certification arteq
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Tuesday, February 14, 2012

quick switch...


the big difference...

process switching requires cpu involvement with every forwarding decision

fast switching relies on the cpu as well but once a packet is forwarded,
the destination path is stored in fast switching cache.  this allows the
path to be re-used from the cache and precludes a new look up by the cpu
for that path

cef is the next evolution enabling the router to forward packets yet
faster.  it builds a forward information base and an adjacency table.
access is quick because it is bulit into the hardware (asics).  the fib contains
pre-computed reverse lookups as well as next hops, and layer 2
information and the interface to use.

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