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Daughter cards


When you have DFC card in each and every line module in the chassis, you still need a PFC card?..



Cisco Employee

PFC stands for "Policy

PFC stands for "Policy Feature Card" and it's present on the Supervisor, and can be present on the line cards. DFCs, or "Distributed Feature Card" are present only on the line cards, and on some devices (like Cat6500 or 7600 router) can be added at later time to upgrade the capabilities of device.

For the Supervisor, PFC is always there - it can be offloaded by decisions taken by DFCs at line cards, but it's there to hold both forwarding information & features - like ACLs, QoS policies and so on.

On the line cards (for Catalyst 6500 and 7600 router) there's no PFC installed, they're using central PFC on the Supervisor to provide services/forward traffic.

Super Bronze

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What PFC card?  What device?


If all (6500/6807) line cards have DFCs, you still need a sup card as it's the "master" copy.  DFCs off-load work that would otherwise be done by the sup card, but they don't eliminate the need for it and all its components.