Giuseppe Larosa Wed, 05/20/2009 - 12:16
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Hello Carl,

PFC3 is the multilayer central engine and it is part of Sup720 (a daughter card of it ).

DFC3 are daughter cards that can be installed on linecards (not all types only the ones that can inteconnect to 720GBps switching fabric) in order to achieve distributed multilayer switching:

DFC3 can store a complete copy of CEF table built by sup720/MSFC3/PFC3.

traffic between two DFC3 equipped linecards don't need to use supervisor resources not even to consult the CEF table in the PFC3 for first packets of flows (lookup is done in DFC3): packets are moved in the switching fabric

In reality a chassis can host different types of linecards with different capabilities so a mix of centralized vs distributed forwarding happens.

Hope to help


carl_townshend Wed, 05/20/2009 - 13:35
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can you explain a little more in detail, what each card does? i am a little unsure what you mean.



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