From: akbar khan (ciscokhan@hotmail.com)
Date: Sun Jul 11 2004 - 18:03:13 GMT-3
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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