CEF: show commands

Published by Keyboard Banger on


this demonstrates that IP CEF is not enabled, until SVIs are created:

Once SVI is created, CEF tables are created too, and stay there even if we delete the vlan and the SVI:




Now we set back vlan 101 and its SVI. We display the FIB table:

We do a ping to the attached host (in the vlan). A new entry is added to FIB:



We create SVI 103. FIB is updated. Then we ping from host1 to SVI 103:

Now let’s show the adjacency table AT:


Keyboard Banger

Keyboard Banger is a network engineer from Africa. He has been working in network support and administration since 2008. He started writing study notes about certification exams and technology topics a couple of years ago. When he's not writing articles, he can be found wandering on technical forums.

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