From: Cary Anderson (caryande@xxxxxxxxx)
Date: Mon Jan 29 2001 - 19:28:10 GMT-3
You don't. When your network stabilizes it will only come up to back up the
link you want, or if any changes happen to the network.
----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Mike S. Lee
Sent: Monday, January 29, 2001 2:11 PM
To: Rick Burts
Cc: Kevin Baumgartner; Wade Edwards; ccielab@groupstudy.com
Subject: RE: ISDN Backup without the backup interface command?
How would one stop the dial line from coming up if you are redistributing?
Mike
At 05:03 PM 1/29/2001 -0500, Rick Burts wrote:
>Mike
>
>There is a pretty well known behavior of demand circuit activating
>when the environment includes some other protocol on the router and
>redistribution of that protocol into OSPF. Briefly the other protocol
>sees the ISDN going down as a routing change which is redistributed into
>OSPF which brings the link up to advertise the change. You can look into
>the archives for more extensive discussions of this.
>
>Rick
>
>Rick Burts, CCSI CCIE 4615 burts@mentortech.com
>Mentor Technologies 240-568-6500 ext 6652
>133 National Business Parkway 240-568-6515 fax
>Annapolis Junction, Md 20701
>
>Chesapeake Network Solutions has now become Mentor Technologies.
>Mentor Technologies is a certified Cisco Training Partner and also
>a Cisco Professional Services partner.
>We offer most of the Cisco training courses.
>We also offer training in Checkpoint Firewall software and
>Fore Systems (now Marconi) and MicroMuse.
>We also provide network consulting services including
>design, management, and problem solving.
>We have 22 CCIEs on our staff.
>We offer the breakthrough VLAB remote access technology for
>access to pratice configuration on real equipment.
>
>On Mon, 29 Jan 2001, Mike S. Lee wrote:
>
> > In trying to use the Demand circuit option I still see the dialer
dialing.
> > Debugging Q931 is see that the dial cause is 224.0.0.5 which is all spf
> > routers. I thought that using an ospf demand circuit should have
> suppressed
> > all LSA's from going across this line. Can someone either explain this
> > behavior or provide a working config that uses demand circuits and only
> > comes up when the primary link fails? Any debug outputs would be
> helpful as
> > well.
> >
> > thanks
> >
> > mike
> > At 11:53 AM 1/29/2001 -0800, Kevin Baumgartner wrote:
> > >I have heard this a few times but I have had no problems using it with
> OSPF.
> > >Maybe this was a limitation in earlier 12.0 images.
> > >
> > > Kevin
> > >
> > >
> > >At 01:18 PM 1/29/01 -0600, Wade Edwards wrote:
> > > >As I recall dialer watches work only with IGRP and EIGRP. If you
> need OSPF
> > > >then the demand circuit is the best way to go.
> > > >
> > > >-----Original Message-----
> > > >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf
Of
> > > >Jeremy Gray
> > > >Sent: Sunday, January 28, 2001 2:34 PM
> > > >To: ccielab@groupstudy.com
> > > >Subject: RE: ISDN Backup without the backup interface command?
> > > >
> > > >
> > > >
> > > >A demand circuit is useful if you really msut run OSPF over an ISDN
> line.
> > > >
> > > >A better answer to this problem is to use a dialer watch-list, a
> very cool
> > > >facility used to trigger DDR when a 'watched' route is absent in the
> routing
> > > >table.
> > > >
> > > >This is great for a number of reasons.
> > > >
> > > >1) Packet switched networks are not the best at telling a DTE when
> there's a
> > > >problem in the cloud. Examples being ATM and FR
> > > >Interface may stay up/up even if the remote is down.
> > > >
> > > >2) You can place a DDR in a place further into your network rather
> than on
> > > >the same router as a critical link and still have DDR work when the
link
> > > >fails if the routes being watches originate beyound the point of
> failure.
> > > >
> > > >Regards,
> > > >
> > > >Jeremy.
> > > >
> > > >PS: Joined today. Lab date March 8th.
> > > >-----Original Message-----
> > > >From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf
Of
> > > >Robert DeVito
> > > >Sent: 28 January 2001 16:39
> > > >To: obuba@bellatlantic.net; mac38456@pegasus.cc.ucf.edu;
> > > >ccielab@groupstudy.com
> > > >Subject: Re: ISDN Backup without the backup interface command?
> > > >
> > > >
> > > >
> > > >
> > > >Another thing to keep in mind is that ospf demand circuit will cause
the
> > > >isdn circuit to come up when there is a topology change.. So don't
be
> > > >shocked when it comes up every once and awhile.
> > > >
> > > >Robert
> > > >
> > > >----Original Message Follows----
> > > >From: "Nnanna Obuba" <obuba@bellatlantic.net>
> > > >Reply-To: "Nnanna Obuba" <obuba@bellatlantic.net>
> > > >To: "Miguel A. Ciena" <mac38456@pegasus.cc.ucf.edu>,
> > > ><ccielab@groupstudy.com>
> > > >Subject: Re: ISDN Backup without the backup interface command?
> > > >Date: Sun, 28 Jan 2001 10:10:43 -0500
> > > >
> > > >That's no trick, use ospf demand circuit
> > > >
> > > >
> > > >Nnanna Obuba, CCIE # 6586
> > > >www.nantech.com
> > > >Online lab for CCIE Preparation
> > > >----- Original Message -----
> > > >From: "Miguel A. Ciena" <mac38456@pegasus.cc.ucf.edu>
> > > >To: <ccielab@groupstudy.com>
> > > >Sent: Sunday, January 28, 2001 9:07 AM
> > > >Subject: ISDN Backup without the backup interface command?
> > > >
> > > >
> > > > > Between R3 and R5 I got a ISDN link. I want to configure my ISDN
> to =
> > > > > back-up my frame relay connection between R3 and R5...Here is
> the Trick:
> > > >=
> > > > > Without using Floating Static and without using the Back-up
> interface =
> > > > > command..My Frame and ISDN are in OSPF area 0...
> > > > >
> > > > > any ideas..
> > > > >
> > > > >
> > > > >
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