From: Dale Shaw (dale.shaw@gmail.com)
Date: Tue Feb 17 2009 - 20:11:30 ARST
Hi Andy,
On Wed, Feb 18, 2009 at 9:04 AM, Andy Hogard <andyhogard@gmail.com> wrote:
> Hmm, yep. :)
>
> Are you sure because there is that authentication field in the update
> message that needs to match. So is it specfic to a particular ios or its
> just the defualt behaviour on cisco?
The auth type fields have to match, but ask yourself, when do the
routers exchange hello packets on a virtual link? (hint: demand
circuit) When do the routers recognise there's a configuration
mismatch?
If you simply apply the authentication configuration on one side, and
wait, nothing happens -- good or bad. If you apply the configuration
on one side, then generate a topology change (like shut/no shut a
loopback), woops! your virtual link drops.
cheers,
Dale
Blogs and organic groups at http://www.ccie.net
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