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Re: How to handle ISDN backup interfaces

To: nv-l@lists.tivoli.com
Subject: Re: How to handle ISDN backup interfaces
From: Jane Curry <jane.curry@skills-1st.co.uk>
Date: Wed, 16 May 2001 17:39:24 +0100
Hi Danny,
Do your routers have loopback interfaces (or could they)??.   Here is a
possibility:

1) Ideally, the router will have a loopback interface - put this in the
seedfile
2) Loopback interfaces are now discovered by default from NetView 6.0
(with the exception of 127.0.0.1)
3) Once the router has been fully discovered, unmanage the ISDN
interface so it?s normal, DOWN status does not contribute to a yellow,
MARGINAL router.  Let?s say, for a small router you have 3 interfaces, a
primary WAN, a backup ISDN and a loopback.  So, in normal operation, you
have:
WAN i/f
Up                                            Green
ISDN i/f                             Down/Unmanaged               Wheat
Loopback i/f
Up                                            Green
Router overall
Up                                            Green
When the WAN line fails, the ISDN backup should kick in, giving:
WAN i/f
Down                                       Red
ISDN i/f                             Up/Unmanaged
Wheat
Loopback i/f
Up                                            Green
Router overall
Marginal                                  Yellow
4)  This scenario relies on the fact that you can still reach the
loopback interface via the ISDN interface

Cheers,
Jane

--
Tivoli Certified Enterprise Consultant & Instructor
Skills 1st Limited, 2 Cedar Chase, Taplow, Bucks, SL6 0EU, UK
Tel: +44 (0)1628 782565
Copyright (c) 2001 Jane Curry <jane.curry@skills-1st.co.uk>.  All rights
reserved.


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