From: Rick Burts (burts@xxxxxxxxxxxxxx)
Date: Mon Jan 29 2001 - 19:23:05 GMT-3
Mike
Usually keeping the subnet from bringing up the ISDN is to use a
filter (distribute list/route map) on the redistribution. There
should be details in the archives.
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
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On Mon, 29 Jan 2001, Mike S. Lee wrote:
> 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 li
nk
> > > > >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 t
he
> > > > >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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