[c-nsp] Mass-renaming interfaces

[Aaron]

Unfortunately no.

On Mon, Sep 28, 2020 at 8:50 AM Eugene Grosbein <eugen at grosbein.net> wrote:

> 28.09.2020 17:12, James Bensley wrote:
>
> > On Mon, 28 Sep 2020 at 07:35, Eugene Grosbein <eugen at grosbein.net>
> wrote:
> >> One of my 7201 routers has four GigabitEthernet interfaces but uses
> only two,
> >> one for IP uplink and another as client-sided downlink with multiple
> >> sub-interfaces named like GigabitEthernet0/1.10 (encapsulation dot1Q).
> >>
> >> It need reconfiguration to use 2x1G port-channles. I already did such
> reconfiguration
> >> for same 7201 router with small number of sub-interfaces and know this
> is doable
> >> changing sub-interfaces from GigabitEthernet0/1.N to Port-channel1.N
> >>
> >> This time the router has about 800 sub-interfaces. I can do some
> scripting
> >> to prepare incremental configuration removing/re-creating
> sub-interfaces,
> >> but I presume high CPU load for router while reconfiguring, long
> procedure time
> >> and notable service degradation or even interruption.
> >>
> >> Is there same another, more lightweight way to mass-rename
> sub-interfaces
> >> while switching from single parent interface to Port-channel?
> >
> > Hi Eugene,
> >
> > If you don't want to do this over a series of incremental changes then
> > you can make one "big bang" change by taking a copy of the running
> > configuration, making all the changes to that, and uploading it to the
> > router as a replacement start-up config file, then just reboot the
> > router to apply the config in one action. However, this approach is
> > risky, you need to test that new full configuration file (confirm that
> > the change only relate to the interface renaming, and that there are
> > no mistakes, typos, wrong VLAN numbers etc.), which is quite tricky.
> >
> > If you've ever wanted a pet project to get you into some network
> > automation and programming stuff this sounds like an ideal project to
> > me. You can definitely do this with Python tools like NAPALM and
> > Nornir. Then you can automate the changes and automate the testing of
> > the changes, and the rollback if required, in either multiple stages
> > or as one giant change; whatever suits your circumstances best.
>
> I've already wrote my script using AWK, it took moderate amount of time
> to write and debug; it resulted in less than 50 lines. For each
> sub-interface
> it removes all "ip route" commands referring to it (if any) then removes
> the interface,
> then adds it back with new name, then re-adds removed routes changing
> interface name.
>
> It's quick-n-dirty but works and is fine for one-time job.
>
> My question was if IOS has some better way to rename sub-interfaces I
> could be unaware of.
>
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