Which Cisco Express Forwarding table or tables hold forwarding information?
Which Cisco Express Forwarding table or tables hold forwarding information?
Cisco Express Forwarding (CEF) tables that hold forwarding information are the Forwarding Information Base (FIB) and the adjacency tables. The FIB contains information similar to the routing table and is used for making destination-based forwarding decisions. The adjacency tables maintain Layer 2 next-hop addresses for all FIB entries. Both tables work together to provide efficient and optimized packet forwarding.
“This separation of the reachability information (in the Cisco Express Forwarding table) and the forwarding information (in the adjacency table), provides a number of benefits:” https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipswitch_cef/configuration/15-mt/isw-cef-15-mt-book/isw-cef-overview.html#GUID-993D4B0C-C032-420D-8304-F56AAB1CECC6