From: OhioHondo (ohiohondo@columbus.rr.com)
Date: Wed May 14 2003 - 10:46:43 GMT-3
Jung
It is not the overall purpose of Dialer Watch to exclude going to a backup
circuit if only route A or route B becomes unavailable. The selection of the
routes to watch in Dialer Watch is critical in its' proper operation.
The overall purpose of Dialer Watch and OSPF Demand is exactly the same --
to back up the primary link. OSPF Demand has a better convergence time and
only works with OSPF.
-----Original Message-----
From: Jung, Jin [mailto:jin.jung@lmco.com]
Sent: Wednesday, May 14, 2003 9:18 AM
To: 'OhioHondo'; Umair Hoodbhoy; ccielab@groupstudy.com
Subject: RE: What use are ospf demand circuits when you have
dialer-watch?
You need to use demand-circuit, if you need to back up all ospf network,
Dialer-watch can only back-up the route that u have on your route table.
Let's say you have route in area 5 6 hops away,
With demand -circuit, if this ospf network goes down, it will generate LAS
and isdn link will be synced to FULL,
With dialer watch, nothing will happen, since primary route never went down.
Ospf demand circuit is part of OSPF,
Dialer watch will only watch the route that you setup.
Jin jung...
-----Original Message-----
From: OhioHondo [mailto:ohiohondo@columbus.rr.com]
Sent: Sunday, May 11, 2003 2:32 AM
To: Umair Hoodbhoy; ccielab@groupstudy.com
Subject: RE: What use are ospf demand circuits when you have dialer-watch?
I believe OSPF demand circuits, because they cause the LSA's learned by the
ISDN circuit to be saved, have a quicker convergence -- therefor data
traffice is less disrupted when the primary fails.
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com]On Behalf Of Umair
Hoodbhoy
Sent: Saturday, May 10, 2003 11:00 PM
To: ccielab@groupstudy.com
Subject: What use are ospf demand circuits when you have dialer-watch?
Hi folks,
If you're using dialer-watch in an OSPF environment, and have the following
lines for interesting traffic:
access-list 101 deny ospf any any
access-list 101 permit ip any any
dialer-list 1 protocol ip list 101
then why would you want to configure OSPF Demand Circuits? Shouldn't the
first statement of access-list 101 do the same thing i.e. deny OSPF Hellos
and LSAs from bringing up the link?
Thanks.
-- Umair
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