Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. And see here for current known issues.

New Member

Serial sub interface


If i create put encap frame on a main interface and create a sub interface and then I delete the sub interface using no int se1/0.1 etc .

By doing the above no int se1/0.1, will I see se1/0.1 when i issue sh ip int brief or will i see it as deleted down?

Please help. Thanks.


Re: Serial sub interface

i think u can delet a sub interface only by reloading the router..

just try "default inter ser 1/0"

note this cmd will clear all ur configs under interface.


Re: Serial sub interface

hey i tried "default int ser 1/0".It doesnt remove the sun interface,but just clears the configuration...

i think options is give "no int ser 1/0.1" and then reload it without saving the config ..

New Member

Re: Serial sub interface


By issuing "no int s1/0.1" or "default int s1/0.1", the sub interface will reflect as deleted down when "sh ip int brie" is given.

i reckon reloading will remove the subinterface but will not a feasible solution on a live network.

Edit - ** the config under the subint will be cleared on giving the above commands.

Re: Serial sub interface

Yes Aditya is correct.

Only the configs under the sub interface are removed and it is displayed as deleted down in the sh ip int brief command

You need a reboot to clear these interfaces



New Member

Re: Serial sub interface

Thanks everyone for the reply. Here a question. If I issue the no int command, and the sub-interface show as deleted.

1. If i dun reboot the router and i do a write mem, can i say that the sub-interface is basically not present although it show deleted cos sometimes it not advisable to reboot the router in production. ?

2. When i do a write mem and reboot the router later on, will the sub-interface be shown when i issue a sh ip int brief?

PLease help. Thanks.


Hall of Fame Super Bronze

Re: Serial sub interface

1. Correct.

2. No, it won't be shown.

New Member

Re: Serial sub interface

Thanks Edison

New Member

Re: Serial sub interface

Hi ,

I think you won't see that deleted interface.


cp gupta

CreatePlease login to create content