From: Ludwig Morales (lud.morales@xxxxxxxxxxxxxx)
Date: Sat May 11 2002 - 19:26:21 GMT-3
nope, not exactly, you could just deny ospf from triggering the ISDN trough
the dialer group command, this way the link will only come up when the watch
route is missing even without configuring ospf demand circuit .
Ludwig
----- Original Message -----
From: "Curtis Phillips" <cphillips@suscom.net>
To: <steven.j.nelson@bt.com>; <ccielab@groupstudy.com>
Sent: Saturday, May 11, 2002 3:41 PM
Subject: Re: Justification for use of Dialer-watch in OSPF
> Steve,
>
> I think you will find that demand-circuit is still required if
dialer-watch
> is used with OSPF.
> Set it up and you will see that the OSPF will keep the ISDN up.
>
> Curtis
> ----- Original Message -----
> From: <steven.j.nelson@bt.com>
> To: <cphillips@suscom.net>; <ccielab@groupstudy.com>
> Sent: Saturday, May 11, 2002 11:53 AM
> Subject: RE: Justification for use of Dialer-watch in OSPF
>
>
> > Curtis
> >
> > Think you may have answered your own question here except for one small
> > point.
> >
> > Dialer Watch and OSPF Demand circuit are not and were never meant to
work
> in
> > conjunction with each other, they are two separate technologies that
allow
> > demand (Dialer, X.25, atm and frame svc etc etc) circuits to keep quiet
> > unless a specific condition is met.
> >
> > In the case of ospf demand circuit the trigger is a change in topology
etc
> > etc
> >
> > In the case of Dialer Watch when a watched route dissapears from the
> routing
> > table
> >
> > Don't confuse the two and use them as they are meant separately...
> >
> > HTH, ant more questions mail me off line...
> >
> > All the best
> >
> > Steve
> >
> > -----Original Message-----
> > From: Curtis Phillips [mailto:cphillips@suscom.net]
> > Sent: 11 May 2002 16:29
> > To: ccielab
> > Subject: Justification for use of Dialer-watch in OSPF
> >
> >
> > Hello All,
> >
> > I was thinking about the use of Dialer-watch with OSPF over ISDN. I know
> > that
> > demand-circuits are used in conjunction with dialer-watch in the same
> manner
> > as protocol packets are filtered by dialer-lists fro EIGRP or IGRP.
> >
> > Demand interfaces allow the dialer to bypass keep-alives and to dial
only
> > when there is a change (addition or deletion) of LSA in the OSPF
database.
> >
> > It seems to me that demand circuits would adequately cover the
suppression
> > of
> > dial related to anything other than a change in database LSAs. So, I
> wonder
> > what the perceived benefit is of using dialer-watch with OSPF. Unless it
> is
> > to
> > track routes that are not in the OSPF process.
> >
> > Any thoughts?
> >
> > Thanks,
> >
> > Curtis
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