The UPC handles all packet processing operations within the Cisco Nexus 5000 Series server switch. It is an L2MP device with the capability to operate simultaneously and at wire speed with the following protocols:
⢠Classical Ethernet
⢠Fibre Channel
⢠FCoE
On the ingress side, it handles the physical details of different media, maps the received packets to a unified internal packet format, and makes forwarding decisions based on protocol-specific forwarding tables stored locally in the ASIC. On the egress side, it remaps the unified internal format to the format supported by the egress medium and Layer 2 protocol and transmits the packet.
This white paper should help you out...
http://www.cisco.com/en/US/prod/collateral/switches/ps9441/ps9670/white_paper_c11-462176.html