From: alsontra@hotmail.com
Date: Tue Jul 13 2004 - 00:46:24 GMT-3
The dialer-group will define interesting traffic (with exception of OSPF
hellos) . If the primary link is down, traffic using the auxiliary path will
keep the interface up. Given this fact, why would you use dialer-watch
with ospf demand circuit? The only reason, I can come up with is if your
asked to keep the backup interface up for the duration of the outage or a
certain period after an outage.
I always question backup methodologies, because it just to easy to shed
points in the ISDN section.
???????
Alsontra
----- Original Message -----
From: "Richard Dumoulin" <richard.dumoulin@vanco.es>
To: "ccie2be" <ccie2be@nyc.rr.com>; "akbar khan" <ciscokhan@hotmail.com>;
<cccie71@yahoo.com>; <ccielab@groupstudy.com>; <security@groupstudy.com>
Sent: Monday, July 12, 2004 7:44 AM
Subject: RE: OSPF Demand Circuit with Watch List..
> Yes but once ospf has synchronised, demand circuit will not maintain the
> call, dialer watch will.
>
> --Richard
>
> -----Original Message-----
> From: ccie2be [mailto:ccie2be@nyc.rr.com]
> Sent: lunes, 12 de julio de 2004 15:51
> To: akbar khan; cccie71@yahoo.com; ccielab@groupstudy.com;
> security@groupstudy.com
> Subject: Re: OSPF Demand Circuit with Watch List..
>
>
> I think that if both ospf demand circuit and dialer watch are configured,
> the ospf demand circuit will trigger a call first because that happens as
> soon as there's a topology change. Dialer watch has to wait until a route
> is removed from the route table. But, I'm not sure. In the lab, I would
> just try to figure out which of these two methods is being asked for and
> configure just that method.
>
> The key to success in this area is to understand how each method works
> (including backup interface) and configure which ever method best meets
the
> lab requirements.
>
> HTH
> ----- Original Message -----
> From: akbar khan
> To: cccie71@yahoo.com ; ccie2be@nyc.rr.com ; ccielab@groupstudy.com ;
> security@groupstudy.com
> Sent: Sunday, July 11, 2004 5:03 PM
> Subject: Re: OSPF Demand Circuit with Watch List..
>
>
> thanks for the clarification...
>
> Tom,
>
> I don't have the config now, in summary I just want to uderstand that,
if
> there is a ospf topolgy change does the BRI willl overlook the configured
> watch-group 1 and trigger the call based on the configured demand circuit.
>
> I know very well that there is no sense of using 2 backup options where
> only one is required but their are some exceptions.
>
> Akbar khan
>
>
>
> >From: Tom Rogers <cccie71@yahoo.com>
> >Reply-To: Tom Rogers <cccie71@yahoo.com>
> >To: ccie2be <ccie2be@nyc.rr.com>, akbar khan <ciscokhan@hotmail.com>,
> ccielab@groupstudy.com, security@groupstudy.com
> >Subject: Re: OSPF Demand Circuit with Watch List..
> >Date: Sun, 11 Jul 2004 07:48:50 -0700 (PDT)
> >
> >ccie2be,
> >R U saying if ISDN is running between R1 and R2 and OSPF in between.
And
> a route is being redistributed from protocol X into OSPF, and that route
> goes away, OSPF will not trigger a call?
> >
> >Akbar,
> >Can U paste your config for R1 where U have DC and Dialer watch
> configured on the same router?
> >I hope you're aware of ospf should an interesting traffic for DC and
> unintersting for dialer watch.
> >
> >Tom
> >
> >ccie2be <ccie2be@nyc.rr.com> wrote:
> >Hi Akbar,
> >
> >I have thought about the same thing not so long ago.
> >
> >Here's how I understand this.
> >
> >In many respects, these 2 commands are functionally redundant - in
other
> >words, they accomplish the same thing but use different methods to do
so.
> >
> >That said, I can imagine there are situations where you have to use
> dialer
> >watch instead of ospf demand circuit. One possible situation is where
the
> >watched route isn't an ospf route. I've never actually seen this
> situation,
> >but here's my thinking.
> >
> >ospf demand circuit will trigger a call only when there's a change in
the
> >ospf topology. But, suppose dialer watch is configured to watch a route
> >that isn't an ospf route or a route redist into ospf. In this case, the
> >ospf topology might not change so with ospf demand circuit configured,
a
> >call is NOT triggered. But, with dialer watch configured, a call is
> >triggered if the watched route disappears from the route table.
> >
> >Again, let me emphasize that I've never actually seen a network where
> dialer
> >watch would work but ospf demand circuit wouldn't work, but I can
imagine
> >Cisco could design a lab in which this could be the case.
> >
> >However, if the network is a pure ospf network, then I believe either
> method
> >would work and there would be no reason to configure both. But, if you
> were
> >configuring dialer watch to trigger the isdn circuit, then you would
need
> to
> >make sure ospf traffic was defined to not be interesting traffic
because
> >otherwise the ospf hello's would keep bringing up the isdn circuit.
> >
> >I would certainly be interested in knowing if others have a different
> >opinion.
> >
> >HTH, Tim
> >
> >
> >----- Original Message -----
> >From: "akbar khan"
> >To: ;
> >Sent: Saturday, July 10, 2004 1:52 PM
> >Subject: OSPF Demand Circuit with Watch List..
> >
> >
> > > Hello Folks, Is it reasonable to use dialer watch-list with Demand
> > > Circuit. Ex: R1---ISDN---R2 & R1----FR----R3-----FR----R2 (Hub &
> > > Spoke) running OSPF on all the links. I have configured R1 BRI for
> Demand
> > > circuit to fire for any ospf topology change. In addition I am
> watching
> > > the Loopback of R2 with watch list. My question is that if there is
a
> > > toplogy change somewhere in the ospf domain except the loopback of
R2
> > > does my R1 will trigger the call with the stipulaiton that it is
> already
> > > configured with watch-list.. I mean can my BRI will trigger the call
> for
> > > both topolongy change or in the loss of R2 Loopback...? Many thanks
> and
> > > Regards in Advance, Akbar khan
> > >
> > >
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