Thanks for your reply, but look at the following paragraph in "Cisco Catalyst 6500 Supervisor Engine 2T - Layer 2 Scalability Enhancements White Paper":
"Figure 1 describes the Layer 2 forwarding operation of the Policy Feature Card 4 (PFC4) on the Supervisor Engine 2T. This operation also applies to any Distributed Forwarding Card 4 (DFC4) equipped line cards.
The biggest change occurred from PFC2 to PFC3, when the MAC address table was moved from a standalone chip on the PFC2 into the Layer 2 forwarding chip on the PFC3. Over time, the size of the MAC address table has gradually increased, and just as importantly the hash efficiency has increased as well."
So from what I gather, every line card can be equipped with a separate DFC which has its own MAC table of 128K and the important point is that the FIB is copied from the supervisor to LCs not the CAM table according to Cisco documentation which we can deduct that the CAM table is separate on every LC. Correct me if I am wrong.
"The MSFC builds the Cisco Express Forwarding information Base (FIB) table in software and then downloads this table to the hardware Application-specific-integrated circuits (ASICs) on the PFC and DFC (if present) that make the forwarding decisions for IP unicast and multicast traffic."
Hash Efficiency of PFCs and DFCs for Cisco Catalyst 6500 Series Switch
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PFC4/4XL
DFC4/4XL
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128K
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99%
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127K
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Regards,
Hesam
