What is the difference between msfc and pfc

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Simply put the MSFC makes the initial forwarding decision of a packet, the PFC cache's this information and forwards any subsequent packets, it obviously rewrites the layer-2 headers when routing packets between VLAN's or interfaces. The MSFC also run's your routing protocols etc. It can do this with or without the MSFC. Multilayer Switch Feature Card is the Layer 3 switching engine that sites on the Catalyst Supervisor as a daughter card.

The MSFC is an integral part of the Supervisor Engine, providing high performance, multilayer switching and routing intelligence. In older switches, the MSFC function was actually handled on a dedicated module. In new supervisors, the MSFC is integrated into the supervisor.

Looking into the packet headers to determine if this switching operation will be a Layer 2 or a Layer 3 operation. If it is going to be a Layer 3 operation, then it will hand off the packet to the Layer 3 engine for further processing. QoS mechanism for ACL classification, marking of packets, and policing rate limiting.

Security mechanism for validating ACL rules against incoming packets. Maintaining Adjacency entries and statistics. Maintaining Security ACL counters. The rule is that the system will operate at the lowest common feature denominator Table 3.

Packet Forwarding Packet Forwarding is done on the ingress forwarding engine. Table 4. Fabienne Stephanoff. Cisco Employee. Arumugam Muthaiah. Very good document. Calin C. Thanks Calin! Amjad Abdullah. Thank you Sunil. Nice Document to understand architecture. A summarized resource. Community Member. Excellent Job! Sunil Khanna.