From: Rick Burts (burts@xxxxxxxxxxxxxx)
Date: Mon Apr 16 2001 - 21:05:02 GMT-3
Jay
There is one aspect of your reasoning that I do not understand.
Assuming your scenario: the dialer list will deny ospf as interesting
traffic, and a ping brings up the line so adjacencies are formed and
ospf routes are added to the table. What happens when the line has gone
inactive and some link change generates an LSA which we need to
transmit to the neighbor on the demand circuit but ospf cannot bring
up the link because it is not interesting ? I think this may appear
to work in a limited lab scenario but ultimately I think this is a
broken implementation. I agree with Chris that the better
implementation has ospf as interesting traffic in the dialer list.
Rick
Rick Burts, CCSI CCIE 4615 burts@mentortech.com
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On Sun, 15 Apr 2001, Jay Hennigan wrote:
> On Sun, 15 Apr 2001, Chris Mott wrote:
>
> > I've never understood the reasoning behind a dialer-list that has "deny osp
f
> > any any", as I thought the whole reason for an OSPF demand-circuit was that
> > OSPF could bring up the link if a routing decision deemed it necessary ...
> > please correct me if I'm wrong ...
>
> The dialer-list keeps the OSPF multicast traffic from bringing up the link,
> but doesn't deny it from traversing the link. Once the link has been
> established once (like by a ping), then the OSPF routes will be learned
> and retained.
>
> Normal IP traffic destined for that link (if not denied by an access
> list) will then bring up the dialer.
>
> --
> Jay Hennigan - Network Administration - jay@west.net
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