From: Nelson Herron (nelsonrherron@earthlink.net)
Date: Thu Feb 06 2003 - 23:43:19 GMT-3
I have heard this alledged. I have not been able to get dialer watch to
work on a pair of NP-4Bs. If I use the config in Solie's book, it comes up
and never goes down (more or less) and if I change my dial-list to use an
access list containing:
access-list 101 permit eigrp any any
access-list 101 permit tcp any any
it won't come up unless I ping the other end of the ISDN link, then it times
out ordinarily. When I plug/unplug the serial link that provides the normal
connection I get the dialer announcements under "debug dialer event", but it
does not seem to actually interact with the bri 0. When I have a "dialer
map ip" for the watch address included in the config, the routing table
always shows the watch address as learned through the bri 0 (connected)
even if I have the serial link up. If I pull that "dialer map ip" then the
link shows up as learned normally when the serial line is live and it shows
up properly when I initiate the ISDN connection with a ping and the serial
line is down. However, I get the missing map message as part of the "debug
dialer events" output. Have you any guesses short of looking at a hundred
pages of configs and debugs? I have posted it to the professional page but
no takers yet - of course I posted the wrong config/debug the first time,
which makes me look and feel like an idiot. But that is the way it happens.
Thank you,
Nelson Herron
----- 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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