RE: Dialer Watch idle timeout

From: Brian Dennis (bdennis@internetworkexpert.com)
Date: Sun Apr 03 2005 - 01:43:49 GMT-3


<Quote>
When the ISDN call comes up because of watched route loss how does the
dialer idle-timeout functions. Does it reset the link after 120
seconds (default) and interface comes up again because the watched
route is still missing.
</Quote>

When the idle-timeout starts to expire, dialer watch will "wake up" and
check to see if the watched route is still missing from the routing
table. If the watched route is still missing, the router will reset the
idle-timeout. To effect how often dialer watch checks the routing
table, use the "dialer idle-timeout" command. The default value is 120
seconds of course. Lastly use the "debug dialer" command to verify the
dialer watch operation.

<Quote>
Even if the router that made the call doesn't disconnect the call the
far end router would disconnect the call after 120 seconds. The
solution would be to set the idle timeout to 0. Here is the problem
though, the far end router is also allowed to dial when there is some
interesting traffic (eg. icmp) anytime this router dials it will never
disconnect the call, which isn't allowed.
</Quote>

Just put the "dialer idle-timeout 120 either" command on the router with
dialer watch configured so that it'll drop the link due to the lack of
interesting traffic when the call is received from the remote router.

HTH,

Brian Dennis, CCIE #2210 (R&S/ISP-Dial/Security)

bdennis@internetworkexpert.com
Internetwork Expert, Inc.
http://www.InternetworkExpert.com
Toll Free: 877-224-8987
Direct: 775-745-6404 (Outside the US and Canada)

-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Sundar Palaniappan
Sent: Saturday, April 02, 2005 7:51 PM
To: ccielab@groupstudy.com
Subject: Dialer Watch idle timeout

Guys,

I have a couple of doubts regarding dialer watch. Hope I can clear up
from the group.

When the ISDN call comes up because of watched route loss how does the
dialer idle-timeout functions. Does it reset the link after 120
seconds (default) and interface comes up again because the watched
route is still missing.

Even if the router that made the call doesn't disconnect the call the
far end router would disconnect the call after 120 seconds. The
solution would be to set the idle timeout to 0. Here is the problem
though, the far end router is also allowed to dial when there is some
interesting traffic (eg. icmp) anytime this router dials it will never
disconnect the call, which isn't allowed.

TIA,
Sundar Palaniappan



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