Default interface configuration command

The easiest way to remove all settings from an interface is to use the default interface configuration command. For example, if you've configured Frame Relay interface with subinterfaces ...
interface Serial0/0/0
 no ip address
 encapsulation frame-relay
 load-interval 60
!
interface Serial0/0/0.100 point-to-point
 bandwidth 2000
 ip address 172.16.1.1 255.255.255.252
 ip load-sharing per-packet
 ip ospf cost 50
 frame-relay interface-dlci 100
... and have erase all interface-specific configuration, the ...

rtr(config)#default interface serial 0/0/0
Building configuration...

Interface Serial0/0/0 set to default configuration
... gets you there. As you can see, after the configuration change, the main interface has no IP address and the subinterface is deleted.
a1#show ip interfaces brief
Interface          IP-Address  OK? Method Status     Protocol

... non-relevant lines deleted ...

Serial0/0/0        unassigned  YES TFTP   up         up
Serial0/0/0.100    unassigned  YES manual deleted    down

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13 comments:

  1. Anonymous 02 December 2008 17:31
    I love this command!
  2. Anonymous 07 January 2009 09:31
    @anonymous - Love? Get a life :-) But indeed VERY useful.
  3. Anonymous 30 January 2009 06:02
    I'm not near any lab equipment at the moment, so I'll just ask this question:

    is it possible to apply this using the range command?

    default interface range gi1/0/20 - 40

    Sorry, I would like to have been able to post up the result myself.
  4. Ivan Pepelnjak 31 January 2009 09:49
    @Nickwalt: Looking purely at parser help, it looks like you can use the "range" keyword.
  5. Anonymous 15 July 2010 04:00
    Great tip! Indeed it works with the "range" command. I just ran it on several ports on an Etherswitch module in a 3725:

    Rack1SW2(config)#default interface range f1/7 - 15
    Rack1SW2(config)#

    Worked briliantly.
  6. anonym 21 February 2012 16:26
    How about Nexus 5000 ?
    Ther are no default command available on this devices ???
    Replies
    1. Anonymous 05 November 2012 23:28
      Did you ever get an answer to the Nexus question?
    2. Anonymous 07 April 2013 09:02
      no the nexus serie does not know this command
    3. Anonymous 14 January 2015 22:46
      Yes it does

      System version: 5.2(1)N1(8a)
  7. Unknown 15 February 2013 16:32
    What is the default command for removing all the information in cisco ASA, as we have nameif, security-level, ip address..thanks in advance Mr. Ivan Pepelnjak
  8. Anonymous 13 July 2014 17:04
    Hi , you can use this command on nexus product from release 6.2
  9. Unknown 25 May 2017 17:51
    no switchport
    switchport
  10. Unknown 25 May 2017 18:40
    no switchport
    switchport

    Converting to L3, then back to L2. Removing int config.
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