From: Dave Shoenfelt (dave@shoenfelt.net)
Date: Tue May 27 2003 - 22:30:28 GMT-3
The Dialer Watch feature is triggered only when the primary route is removed
from the routing table. If the primary link fails to come up during initial
startup of the router, the route is never added to the routing table and
will not be watched. Enabling the delay route-check initial time option of
the dialer watch-list command ensures that the router will dial the backup
link if a primary link fails during initial startup.
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/fdia
l_r/drfd.htm#1102823
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Daniel Cisco Group Study
Sent: Tuesday, May 27, 2003 5:54 PM
To: ccielab@groupstudy.com
Subject: Dialer Watch Technology Flaw ????
I came across a "feature" in Dialer watch today...
R1(Spoke)---------R2(Hub)
R1 uses ISDN as backup for its main link to the Hub site. Backup is
configured using dialer-watch and it works very well.
R1 watches a route, and brings up the ISDN when the route disappears. So far
so good.
However, if I reboot R1, and the main link to the hub fails at the same
time, dialer watch never brings up the ISDN link once the router finishes
its boot sequence. The reason for this (I guess) is that when the router
reboots, it is watching a route which has never existed (as far as the
router knows). Therefore dialer watch does not bother to bring up the backup
link.
Some of you may think that the chances of this scenario occurring is quite
slim. However, it did happen to me this morning! It is also quite
conceivable that someone may decide to "reboot" the router is an effort to
restore the main link...... If they do this, then bye bye backup.....
Has anyone come across this before? Is there a workaround? Can I turn this
feature off? (but still use dailer watch).
Daniel
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