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Webcast-Catalyst9k
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DFC

Scenario:

Many gigabit connected hosts getting backed up to a single host. How useful is the DFC daughter-board on a 650x in this scenario? It seems to me that the DFC is mostly used for *intra-module* speed increases and not really *inter-module*. Is this correct?

TIA

2 REPLIES
New Member

Re: DFC

Hi,

I guess, ( and it is GUESS ) it is used for Intra-module speed increases.

New Member

Re: DFC

Not really.

The DFC gives you distributed forwarding, so each line card is capable of making a forwarding decision instead of using the supervisor to do so. The forwarding is done via the switch fabric, so you could say the DFCs offloads the supervisor.

Using DFCs will give you this 'supervisor offload' for any traffic, not just traffic that stays on the blade. (Actually, even 'local' traffic doesn't *stay* local, but still hits the fabric).

Check out the architecture white paper at http://www.cisco.com/en/US/products/hw/switches/ps708/products_white_paper09186a0080092389.shtml

HTH,

-A

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