From: Robert DeVito (robertdevito@xxxxxxxxxxx)
Date: Fri Jan 19 2001 - 21:43:16 GMT-3
That would work, just don't forget to make ospf uninteresting.
----Original Message Follows----
From: "Mark Stover" <mstover@cisco.com>
Reply-To: "Mark Stover" <mstover@cisco.com>
To: "'Jimmy Dotson'" <dotsonjl@epb.net>, <ccielab@groupstudy.com>,
<ben@kesslerconsulting.com>
Subject: RE: OSPF demand circuits (Lab 8a)
Date: Fri, 19 Jan 2001 16:30:58 -0500
You could also do a dialer-watch on the IP subnet that lives on the ethernet
segment.
Mark
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
> Jimmy Dotson
> Sent: Friday, January 19, 2001 1:53 PM
> To: ccielab@groupstudy.com; ben@kesslerconsulting.com
> Subject: Re: OSPF demand circuits (Lab 8a)
>
>
> You are right. This is what I was getting at in response to
> an earlier question that had to do with OSPF on dialer
> interfaces w/on-demand and backup int. In this case I would
> use a backup interface statement on my ethernet interface.
> This puts my BRI in standby state, until the ether fails or
> drops (I've had problems forcing this with an admin down - I
> had to actually pull the ether cable). This is how I would
> back up the ethernet in this case. So the only way BRI comes
> up is if the ether is broken.
>
> Jimmy
>
> >>> "R. Benjamin Kessler" <ben@kesslerconsulting.com>
> 01/19/01 12:27PM >>>
> Hi all,
>
> Just a quick question about OSPF demand circuits. I've setup
> a sub-lab to
> test OSPF demand circuits; I've used the doc CD as a
> reference and have
> things working nicely - BRI only dials when a topo change occurs, etc.
>
> The main difference between the CD and the R5/R6 configs for
> Lab8a is that
> in the lab only R6 is configured to dial R5; on the CD both
> routers dial
> both ways.
>
> I modified my lab to emulate that of Lab8 - e.g. two routers
> connected via
> e-net link as primary with BRI as backup and removed the
> phone number from
> R5 so it only accepts calls.
>
> This seems to work also, albeit a bit slower - waiting for
> the dead interval
> and all...my question is as follows:
>
> OSPF topo changes will cause the BRI to dial even if the main
> interface is
> up - if my understanding of OSPF is accurate, I would believe
> this to be the
> desired behavior.
>
> I guess I'm a bit confused by the statement in the lab that "The ISDN
> connection should only come up if the ethernet connection is
> broken;" Given
> the above logic, this statement doesn't seem too accurate.
>
> Any insight here?
>
> Thanks,
>
> Ben
>
>
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