The Supervisor Engine 720 module supports the Cisco Express Forwarding (CEF) architecture for forwarding packets. The MSFC performs control plane functions, such as learning about the networks, and builds routing tables. It then builds a Forwarding Information Base (FIB) and pushes this to the PFC, which forwards packets to their respective destinations based on the next-hop entries that are located in the FIB. This concept is illustrated below in Figure 7-7:
Fig. 7-7. Topology-Based or CEF-Based Switching Operation
Referencing Figure 7-7, the MSFC receives routing information via routing . . .
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