From: Bola Adegbonmire (BolaAD@Resourcery.com.ng)
Date: Wed Oct 16 2002 - 08:33:24 GMT-3
Hi,
I did something like this a recently and used Dialer watch. Though my DDR link is over an asychromous modem via PSTN. First I will like to know if your Serial interface is a permanent connection. for example is it a frame-relay PVC? If you had something like this
Ethernet
Serial - frame-relay PVC
ISDN
1 make sure that the network been watched "xxxx" by dailer watch is also sent by your dynamic routing protocol (Eigrp/Igrp/OSPF) over the serial link.
2 make sure your Serial interface is made less desirable than your ethernet(default interface bandwidth makes sure though), use bandwidth command
3 make sure ISDN interface is least desirable of all three (use bandwidth command here too)
Scenario is close to this
int e0
bandwidth 10000
!
int s0
bandwidth 256
!
int bri0
bandwidth 64
and you were running your dynamic protocol on all interfaces, you will have network xxxx in topology table(EIGRP) but route through e0 installed in routing table. When e0 no longer receives hello packets, route through serial is installed and finally if PVC goes down then there is no interface in routing table referencing xxxx dialer watch noiw kicks the ISDN link to dial.
-----Original Message-----
From: Ashok.Gupta [mailto:Ashok.Gupta@gmconsultants.com]
Sent: Tuesday, October 15, 2002 7:44 PM
To: 'Azhar Mehmood'; ccielab@groupstudy.com
Subject: RE: Dialer watch
floating static
Regds
Ashok
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of
Azhar Mehmood
Sent: 15 October 2002 17:09
To: ccielab@groupstudy.com
Subject: Dialer watch
Hi,
I have a router R1 ehich has 3 exit points to reach a specific subnet:
1. Ethernet
2. Serial
3. ISDN
As long the route over ethernet is available it's prefered over all other,
after it has gone serial is prefered and as third option the ISDN Link.
Now my problem is how to keep ISDN Link down until both of the primary links
are available. I tried to acomplish it with dialer watch but as soon as the
ethernet is gone dialer watch triggers the call hence it brings it also down
again after idle-timeout.
My question is how to configure the router that it waits until both of the
link 're unavailable and triggering than an isdn call.
regards
AZHAR MEHMOOD
GERMANY
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