From the course: CCNP Switching (300-115) Cert Prep: 1 Layer 2 Technologies

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MLS working with FIB

MLS working with FIB

- [Instructor] Hardware routing information is stored in the forwarding information base. To view the FIB entries for an interfacer vlan, the show ip cef command is used. This will display a prefix, next-hop, and associated interface. If this command produces an error similar to CEF not running, then routing isn't enabled on the switch, and the IP routing command needs to be entered. An admin can use a slightly different version of the command to glean information based on a subnet. Show IP cef prefix IP in mask. The longer prefixes keyword will pick up more specific routes contained in a subnet. The detail keyword does just that. It provides additional details about CEF itself and each entry. Version is the update number of the CEF table entry since generation. Epoch is the number of times the CEF table has been regenerated. There are a few cases when a packet can't simply be hardware-forwarded via the FIB. When a packet needs to be process switched, it's marked as CEF Punt, and sent…

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