From: Tony Schaffran (tschaffran@cconlinelabs.com)
Date: Thu Feb 06 2003 - 18:29:18 GMT-3
Just be carefull with dialer watch and ppp callback. After the idle-timeout
the call is dropped and ther is not trigger to bring call back up because
the watched route is already gone.
That is, of course, unless someone knows a way around that.
Tony Schaffran
Network Analyst
CCNP, CCNA, CCDA,
NNCSS, NNCDS, CNE, MCSE
www.cconlinelabs.com
"Your #1 choice for Cisco rack rentals."
----- Original Message -----
From: "MADMAN" <dave@interprise.com>
To: "Joe Chang" <changjoe@earthlink.net>
Cc: "sam" <sam@avtechusa.com>; <ccielab@groupstudy.com>
Sent: Thursday, February 06, 2003 1:00 PM
Subject: Re: ISDN: Back up interface - Which do you prefer?
> Another nice feature of dialer watch is that it will initiate the
> call without requiring an interesting packet which was a requirement I
> recently ran into.
>
> Dave
>
> Joe Chang wrote:
> > 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
> >>.
> --
> 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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