Ganesh Hariharan Wed, 03/10/2010 - 02:32
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Hi all,

Can any one tell me wath is the diference from a MSC and a forwarding card on a CRS chassis.


Hi ,

MSFC is your  layer 3 engine which is used for routing functionality in your switch,it actually depends on what kind of switch your using.SUP is responsible for layer 2 switching. The MSFC is essentially a Cisco IOS router based upon the high-performance 7200 series router. This provides the route processor functions required by the PFC to implement L3 switching. The MSFC provides the necessary routing information in the PFC route cache so that the PFC can L3 switch packets.

Check out th below link for more information

Hope to help !!


Laurent Aubert Wed, 03/10/2010 - 20:53
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Not sure what you mean by a forwarding card but a CRS line card is made of two parts:

- PLIM: it represents your interfaces. We have fixed and modular (SPA based) PLIM

- MSC: it represents the forwarding engine or the brain of the LC. This is where the ingress/egress features and lookup are done. It also handle the connection to the fabric.



patcbr600 Thu, 03/11/2010 - 02:23
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Hi Laurent,

That is what i know, but ins cisco i found the following card :

Cisco CRS-1 Series Forwarding Processor 40G

   - Paired with the following interface modules: 4-10GE, 42-1GE, 20-1GE-FLEX and

And the normal MSC.

Thus this forwarding card is a enhanced MSC card ?



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