Which Cisco Express Forwarding table or tables hold forwarding information?

4 thoughts on “Which Cisco Express Forwarding table or tables hold forwarding information?”

1. C

   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-B947BE14-70BE-462E-8901-E16B06A3ED6E

   FIB Overview
   Cisco Express Forwarding uses a forwarding information base (FIB) to make IP destination prefix-based switching decisions.

   CEF Adjacency Tables Overview
   A node is said to be adjacent to another node if the node can be reached with a single hop across a link layer (Layer 2). Cisco Express Forwarding stores forwarding information (outbound interface and MAC header rewrite) for adjacent nodes in a data structure called the adjacency table. Cisco Express Forwarding uses adjacency tables to prepend Layer 2 addressing information to packets. The adjacency tables maintain Layer 2 next-hop addresses for all FIB entries.

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   1. Yes. But also written on the link, that “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:”

      CEF table (FIB) – reachability information
      adjacency table – forwarding information

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2. C. FIB and adjacency tables only

   https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/47321-ciscoef.html

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3. C. FIB and adjacency tables only

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