John,
It depends on which IOS version you use. In later images you will need
to either reboot or to remove the process and readd it.
I do not quite remember when this behavior changed.
Rgds,
Patrick
John Deatherage wrote:
> If I add a loopback interface to a router, when will the router take it as
> the router ID? Here's a scenario:
>
> Serial2/1 is the current router ID: 209.1.1.1
>
> I add Loopback0, which is 10.0.0.1
>
> Shouldn't the router take this as its router ID? When does this happen?
> Doing:
>
> clear ip ospf process
>
> Still shows the old router ID. Is there any way to force the router to take
> the ID from the loopback interface? On another router, I couldn't get it to
> change until after reload.
>
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