From: Barnhill, Don (Don.Barnhill@xxxxxxxxxx)
Date: Wed May 09 2001 - 12:15:16 GMT-3
Im not familiar with this lab either, not yet anyways :) But the wording is
interesting.. If you are only to bring up the isdn when the ether goes down,
why not make it a backup for the ethernet. Are there other requirements for
ospf or a demand circuit?? remember, only give them what they ask for. I
dont know any of the other requirements, but its just a thought.
Don
-----Original Message-----
From: Erick B. [mailto:erickbe@yahoo.com]
Sent: Wednesday, May 09, 2001 8:49 AM
To: Scott Young; 'K. Radecki'; ccielab@groupstudy.com
Subject: RE: ccie bootcamp lab 8
You could deny ospf as interesting traffic in your
dialer-list but this will require some other
interesting traffic to be present to bring up ISDN
line automatically or a manual ping to force it up.
Your OSPF is running as expected. It's suppose to come
up when theres a topology change. I'm not familiar
with the bootcamp labs but...
--- Scott Young <syoung@pei.com> wrote:
> It is true that you can use dialer watch for this
> scenario, but my
> experience with testing it just now is that OSPF
> continues to bring up the
> link when the topology changes. It seems that the
> watching router still
> needs to send an LSA to its neighbor on the other
> side. Therefore, dialer
> watch by itself doesn't really fulfill the
> requirement of "...The ISDN
> connection should only come up if the ethernet
> connectivity is broken..."
>
> What else is missing? Or is the question just badly
> worded?
>
> Scott
>
> -----Original Message-----
> From: McCallum, Robert
> [mailto:Robert.McCallum@let-it-be-thus.com]
> Sent: Tuesday, May 08, 2001 11:05 AM
> To: 'K. Radecki'; ccielab@groupstudy.com
> Subject: RE: ccie bootcamp lab 8
>
>
> The question specifically asks you to make sure that
> the ISDN line only
> comes up by the failure of the Ethernet interfaces.
> Clue both the Ethernet
> interfaces are in the same subnet / network.
>
> Is there a way to "watch" for the disappearance of
> that network????
>
> -----Original Message-----
> From: K. Radecki [mailto:kradecki@yahoo.com]
> Sent: 06 May 2001 02:41
> To: ccielab@groupstudy.com
> Subject: ccie bootcamp lab 8
>
>
> I've copmlete lab 8, but still have an issue with
> Section 2 Task 3 Part 1. It states "...The ISDN
> connection should only come up if the ethernet
> connectivity is broken..."
>
> I have the IDSN link configured as an ospf-demand
> circuit, so Hellos and periodic updates don't keep
> the
> line active. Also, I've filtered IGRP from
> redistributing OSPF-learned routes back into OSPF,
> so
> there's no issue there. The problem I'm having is
> that
> the line comes up as soon as the there's a topology
> change in OSPF, ie I take down an interface in the
> network that OSPF advertises, even if the ethernet
> network is active.
>
> Based on the way ospf demand-circuit works, that
> doesn't surprise me. And, in a stable OSPF network,
> the link never comes up. Does the task assume a
> stable
> network? The way I read it, it doesn't. But, I don't
> know how to keep the link from activating using just
> demand-circuit. And, in the configuration they
> provide
> as the solution, they only use ospf-demand circuit.
>
> Thanks,
> Kurt
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:30:37 GMT-3