From: Joe Chang (changjoe@earthlink.net)
Date: Thu Feb 06 2003 - 16:47:16 GMT-3
Sam, the methods you listed serve different purposes.
OSPF demand-circuit and ODR allow protocol neighbors to maintain relations
without hello PDUs, allowing ISDN links to time out and disconnect.
Dialer watch and floating statics trigger calls when specific routes
disappear. Dialer watch can keep the ISDN link from timing out while the
routes are still missing, so it is more appealing than a floating static.
From my personal experience and from recent discussions dialer watch behaves
differently than the first assumptions of many people:
http://www.cisco.com/warp/public/129/bri-backup-map-watch.html
----- Original Message -----
From: "MADMAN" <dave@interprise.com>
To: "sam" <sam@avtechusa.com>
Cc: <ccielab@groupstudy.com>
Sent: Thursday, February 06, 2003 3:48 PM
Subject: Re: ISDN: Back up interface - Which do you prefer?
> Yes floating static route. Of coarse this is not suitable for all
> situations but for the majority it works perfectly well and is simple.
>
> Dave
>
> sam wrote:
> > Hey all, I appreciate your time taken to read this.
> >
> > It is my understanding that there are several methods that can be used
> > to configure an On-Demand ISDN line as a backup.
> > In particular,
> >
> >
> > - OSPF demand-circuit to suppress OSPF hello-packets
> > - EIGRP on-demand-routing (ODR) using CDP to halt EIGRP routing
> > updates keeping link alive
> > - Dialer Watch Group used to monitor specific routes instead of
> > an interface
> >
> > I can understand different methods deployed if you use different routing
> > protocols, but are there any advantages to any method, or a preferred
> > style that you might use? Any other methods you find desirable?
> >
> > TIA!
> >
> > Sam Sena
> > Avtech Technologies
> > 4500 New Brunswick Ave
> > Piscataway NJ
> > (732) 424-8008 (o)
> > (732) 424-7388 (f)
> > .
> --
> David Madland
> CCIE# 2016
> Sr. Network Engineer
> Qwest Communications
> 612-664-3367
>
> "You don't make the poor richer by making the rich poorer." --Winston
> Churchill
> .
.
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