From: Ronnie Royston (RonnieR@xxxxxxxxxxxxxxxxx)
Date: Mon Jan 29 2001 - 19:21:53 GMT-3
...and be sure that you have the broadcast keywork on both dialer maps, or
the demand circuit will go up/down/up/down.
-----Original Message-----
From: Kevin Baumgartner [mailto:kbaumgar@cisco.com]
Sent: Monday, January 29, 2001 2:13 PM
To: Mike S. Lee
Cc: Wade Edwards; ccielab@groupstudy.com
Subject: RE: ISDN Backup without the backup interface command?
Are you doing any redistribution on either of the ISDN routers? This will
cause
LSA's to be sent across the ISDN link. I was just working on a example
where OSPF
and EIGRP where on one of the ISDN routers and was running IP OSPF
demand-circuit.
And redistributing between OSPF and EIGRP and vise-versa. The key when
distribution
back from EIGRP to OSPF is to filter out the ISDN network from getting
redistributed back
into OSPF. I used a route-map on the redistribute eigrp.
Also make sure that you do a passive bri for eigrp.
Kevin
At 03:38 PM 1/29/01 -0600, 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..
>> > >
>> > >
>> > >
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:27:48 GMT-3