Router ID on IPv6-Only

Bjørn Mork bjorn at
Thu Sep 8 07:19:36 UTC 2022

Saku Ytti <saku at> writes:

> On Thu, 8 Sept 2022 at 10:01, Bjørn Mork <bjorn at> wrote:
>> Why would you do it differently than for dual-stack routers, except that
>> you skip the step where you configure the ID as a loopback address?
> Because you may not have an option, if you're IPv6 only, vendors (e.g.
> junos) may expect you to punch it manually. Of course most of us punch
> it manually as loopback0 IPv4 to have more control over outcome.
> Question is legitimate and represents change where previously used
> mechanisms do not apply, therefore OP is right to ask 'well what
> should I do now'.

I'm not used to punching anything, so I probably have too simple a view
of the world.

But I still don't understand how this changes the ID allocation scheme,
which is how I understood the question.  I assume the punched value was
based on input from somewhere?


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