From: Andy Hogard (andyhogard@gmail.com)
Date: Tue Feb 17 2009 - 20:16:24 ARST
Hehehe, thanks ..very well expalined and an easy way of remembering it as
well. Keyword here being "V-links are on-demand circuits"!!
Thanks. :D
On Wed, Feb 18, 2009 at 3:41 AM, Dale Shaw <dale.shaw@gmail.com> wrote:
> 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
>
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