From: Basel Tashkandi (basel@xxxxxxxxxxxxx)
Date: Tue Dec 18 2001 - 12:33:05 GMT-3
Hi Godwin,
My understanding to Dial watch is
it monitors a certain route entry in your routing table. That is the route
and its mask so its that specific. It can be loop back or point to
multipoint in FR they also come with /32 mask.
So if that route disappears from the routing table the dialer watch will
dial to the specified router without having interesting traffic passing
through.
i am not sure if i cleared it or made it worse :)
rgds
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Godwin Pang
Sent: 18 December 2001 06:53
To: ccielab@groupstudy.com
Subject: Dialer watch question
Hi Group,
Please help me to understand Dialer watch.
Quoted from the document
http://www.cisco.com/warp/public/129/bri-backup-map-watch.html
"When a watched route is deleted, dialer watch checks for at least one valid
route for any of the IP addresses or networks being watched. "
"dialer watch-list group-number ip ip-address address-mask : Defines the IP
addresses or networks to be watched. The address or network (with the
correct mask) that is configured must exist in the routing table. "
I think the first quote said I can backup a particular ip address with
dialer watch, while the second one said the ip address with the mask must be
in the routing table.
However, except loopback interface, I seldom see any ip address (with /32
mask) in the routing table. Is it mean I can only WATCH a loopback address?
Can I WATCH a particular interface?
For example: Imagine there is an isdn link between Router A and Router B
-------------e0-Router_A-S0--------------------------S0-Router_B-e0------
-------------
10.1.1.0/24 11.1.1.0/24
12.1.1.0/24
Can I use dialer watch to WATCH the ethernet interface address of Router B?
e.g. dialer watch-list 1 ip 12.1.1.1 255.255.255.255
Another question
Quoted from the document
http://www.cisco.com/warp/public/123/backup-main.html
"Dialer Watch does not rely on interesting packets to trigger dialing. The
link is automatically brought up when the primary route goes down without
postponing dialing. This is an important consideration on Frame Relay
circuits, where the line protocol may not go down if the DLCI is inactive. "
Assume the connection between Router A and Router B is FR, is it mean that
dialer watch will not dial if the watched network is 11.1.1.0/24 because the
DLCI of Router A is still up even the S0 of Router B is down?
I know the solution is to watch the 12.1.1.0 network, but will it dial if I
WATCH the ip address of router B's S0?
Thanks,
Godwin
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