[c-nsp] Renumbering serial interfaces

Ryan Lambert thirdfrl.nsp at gmail.com
Wed Feb 17 13:35:21 EST 2010

You can renumber serial links with one person. Standard disclaimer of paying
attention to detail, being careful, etc.

If you can tolerate a few minutes downtime worst-case (which, I'm making the
assumption this is being done in a window that can), you can also use the
'reload in x' command, where x = minutes. If you botch it and cannot get
back in, the device will reload with the saved startup configuration (ie:
not with your most current changes). You can roll back the near side and be
back up. If all changes are successful, don't forget to reload cancel and
write your changes.

Obviously there are some other things you probably need to consider like
routing protocol adjacencies, or static default routes... so telnet/ssh'ing
in from a directly connected interface may be necessary depending on the

The only time something like this is a bit more tricky is when multiple
changes are required (encapsulation, etc.)

On Wed, Feb 17, 2010 at 1:19 PM, james edwards <
lists.james.edwards at gmail.com> wrote:

> I have a bunch of T-1 (ATM) interfaces that I need to renumber. I have
> always done this with 2 people, one on each end. Is it possible for one
> person to do this, from one end ?
> If I am on the near side, I log into the far sides serial IP and do this:
> LALMR_2620(config)#interface ATM0/0.32 point-to-point
> LALMR_2620(config-subif)#ip address
> LALMR_2620(config-subif)#^Z
> --
> James H. Edwards
> Senior Network Systems Administrator
> Judicial Information Division
> jedwards at nmcourts.gov
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