From: Scott, Tyson C (tyson.scott@hp.com)
Date: Thu Mar 18 2004 - 10:11:16 GMT-3
Dialer-watch list is independent of any traffic. It only
watches for a route and responds when the route you list is missing from
the routing table. It is its own interesting traffic.
OSPF demand-circuit is going to bring up the isdn change any
time there is a change in the OSPF database of the router with the
command on its ISDN link. This could be a desired behavior but it
depends on the requirements.
You could have backup interface but then you will not want to
have ip ospf demand-circuit because the interface will be in backup
until the interface being watched goes down. This would not be
recommended unless you are using some type of logical interface to
watch. Because for instance if you are using an Ethernet interface to
watch and you have a switch in between you will never see the interface
go down even though you loose the remote end.
The other new option with backup is to use dialer persistent.
Regards,
Tyson Scott
Agilent Problem Management Team
Managed Network Services
Phone: 313-583-5812
Pager: 877-997-0811
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Ashok Verma (ashoverm)
Sent: Wednesday, March 17, 2004 9:59 PM
To: ccielab@groupstudy.com
Subject: ISDN Backup question.
Hi All
In following scenario:
( )
|--------R1------- ( Isdn )
| / ( )
|---------R2-----/
\
\
R3
R1 and R2 are connected with the isdn and also thru the ethernet .and
Area 1 is running on these two links .Between the R2 and R3 there is fr
link and running ospf area 0
Now my question is .....R1 should not challenge and also make the backup
of the ethernet interface(without using the backup interface command).
I can do it with the ip ospf demand circuit , but in that case event
some change in area 0 like on R3 some route changes ...make the isdn up
.. So is IP ospf demand circuit is the correct answer in real lab ...or
we need to use some more things additional to it.like dialer watch list
etc.
Thanks in advance.
Regards,
Ashok Kumar Verma
CCIP,CCDP,CCNP
Network Consulting Engineer
Customer Advocacy Advanced Service Dep.
Service Provider AS Div.2
Cisco Systems, K.K.Japan.
Tel: +81-3-5324-4583
e-mail: ashoverm@cisco.com
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