From: Erick B. (erickbe@xxxxxxxxx)
Date: Sun Apr 15 2001 - 23:22:04 GMT-3
Jay is correct but I think to further understand the
dialer-list and demand circuit the below helps.
If the calling router(s) have deny ospf any any for
the dialer-list and it is rebooted, the dialer
connection goes down. When the router comes back up
OSPF neighbor isn't formed over the ISDN since OSPF is
denied. If you have no traffic to bring up the link
then a ping is necessary to force a dial and form a
OSPF adj. The demand-circuit simply suppress's hellos
and doesn't age routes *AFTER* a neighbor adj has been
formed. So, if you deny OSPF make sure theres some
other interesting traffic to bring up the link besides
a manual ping which forces it up.
--- Jay Hennigan <jay@west.net> wrote:
> On Sun, 15 Apr 2001, Chris Mott wrote:
>
> > I've never understood the reasoning behind a
> dialer-list that has "deny ospf
> > 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.
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