Alexander Gall gall at
Tue Feb 3 11:18:57 CET 2009

On Tue, 3 Feb 2009 10:52:34 +0100, Daniel Roesen <dr at> said:

> On Tue, Feb 03, 2009 at 10:35:26AM +0100, Alexander Gall wrote:
>> But beware, if that value is the same as the default derived from
>> the egress interface, the "ipv6 mtu" statement does not appear in
>> the configuration and the MTU changes dynamically when the egress
>> interface changes (which can be a problem in certain cases).

> Argh, I never saw this happen... need to lab that. Is that consistent
> behaviour across all IOS?

A rather Herculean task to find this out ;-) I'm pretty sure it's in
(all, most, some?) 12.2 releases, definitely sure about 12.2(33)SX/R.


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