Using the Cisco Default Interface IOS Command

There is a useful command that every network administrator needs to know on Cisco IOS, which is default interface. This command resets the interface to its default settings, in case you face a networking issue or you don’t understand what’s going on after you made an interface configuration change.

To run the Cisco default interface command:

  • Place yourself at the global configuration level,
  • issue the following command: default interface {interfaceID}.

Here is an example of running the default interface command on a Catalyst 6500 switch.

default-interface-keyboardbanger

Beware that, in the case of a Catalyst 6500 switch, setting an interface back to its default configuration makes it a L3 interface back again! See the no switchport under the interface.

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