From: Godwin Pang (gytpang@xxxxxxxxxx)
Date: Tue Dec 18 2001 - 00:53:11 GMT-3
Hi Group,
Please help me to understand Dialer watch.
Quoted from the document http://www.cisco.com/warp/public/129/bri-backup-map-w
atch.html
"When a watched route is deleted, dialer watch checks for at least one valid ro
ute for any of the IP addresses or networks being watched. "
"dialer watch-list group-number ip ip-address address-mask : Defines the IP add
resses 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 w
atch, while the second one said the ip address with the mask must be in the rou
ting 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 WA
TCH 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 postponin
g dialing. This is an important consideration on Frame Relay circuits, where th
e 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 dial
er watch will not dial if the watched network is 11.1.1.0/24 because the DLCI o
f 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 WAT
CH the ip address of router B's S0?
Thanks,
Godwin
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