You are correct, you will need an MSFC or MSFC2 to do layer 3 and 4 on the Cat6k. The differences in the MSFC and MSFC2 is in software performance. The MSFC can do about 170 kpps while the MSFC2 can do 650 kpps. Keep in mind, that in most environments, the MSFC will not forwarding the traffic since its the Cat6k does multilayer switching.
Depends on traffic throughput needed. All reasons justified the MSFC2 is a faster card and obviously wil provide better future investment in technological terms.
MSFC2 and SUP2 use purely CEF which in most ways is very good and Cisco has ironed out a lot of the original CEF bugs, so for future proofing and pure grunt i would aim for the MSFC2.
The MSFC2 offers enhanced scalability via a 4 times increase in control plane and software switching performance over that of MSFC. This translates into a significant performance enhancement for all applications
So CEF-based architecture is made up of a FIB and an adjacency table is created for Layer 3 forwarding. This FIB has the most current routing information and eliminates the need for the first packet of every flow to be switched in software.
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