I would always setup my DNS with just the loopback address in the DNS forward
lookup tables and then put all the interfaces in the reverse lookup (resolving
to a single box name). Your loopback interface is the one guaranteed to
respond if anything does. You then put the loopback in the seedfile, again
'cos that's the one most likely to respond.
Cheers,
Jane
danny AT uk.ibm DOT com wrote:
> Hi Jane
>
> The routers do have loopback interfaces.
>
> Why should the loopback interface be put in the seedfile, as opposed to the
> interfaces I am currently using to discover the routers?
>
> Cheers,
>
> Danny
>
> =========================================================================
> Date: Wed, 16 May 2001 17:39:24 +0100
> From: Jane Curry <jane.curry AT skills-1st.co DOT uk>
> Subject: Re: How to handle ISDN backup interfaces
>
> 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
>
> ------------------------------------------------------------------------
>
> Æs normal, DOWN status does not contribute to a yellow,
> MARGINAL router. Let
>
> ------------------------------------------------------------------------
>
> Æs 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 AT skills-1st.co DOT uk>. All rights
> reserved.
>
> =========================================================================
>
> Danny Williams
> Tivoli & AIX Specialist
> IBM Global Services - Integrated Technology Services
> mailto:danny AT uk.ibm DOT com
> Tel: 665520 (01926-465520) -- MOBX: 275520 (07967-275520)
--
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 AT skills-1st.co DOT uk>. All rights
reserved.
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