From: Ron Trunk (rtrunk@xxxxxxxxxxxxx)
Date: Tue Jul 13 1999 - 12:19:28 GMT-3
Derek
You could configure your dialer list to define OSPF LSAs as uninteresting.
This will stop LSAs from bringing up the ISDN line
Ron
-----Original Message-----
From: Derek Fage <DerekF@itexjsy.com>
To: ccielab@groupstudy.com <ccielab@groupstudy.com>
Date: Tuesday, July 13, 1999 10:31 AM
Subject: OSPF On-demand
>I've got a bit of a problem with OSPF On-demand circuits.
>
>What I want to do is to use an OSPF On-demand circuit using ISDN to act as
>the backup to ethernet interfaces between two routers.
>
>Due to the fact that it is possible for one ethernet interface to go down
>and the other to remain up, I cannot use the backup interface command, so I
>have configured the ethernet interfaces and the BRI interfaces in the same
>area.
>
>When doing a debug whilst the ISDN is up I see messages indicating that the
>demand circuit is running as expected:
>15:47:56: OSPF: Dead event ignored for 137.20.224.5 on demand circuit BRI0
>
>The problem is that after two minutes the idle timer kicks in and the BRI
>drops. At this stage it would appear that an LSA is generated indicating
the
>link state change and flooded out of all of the interfaces - including the
>ISDN. This in turn brings the line up again and so it continues.
>
>Does anybody have any suggestions as to how to work around this ?
>
>Derek...
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