From: Packet Man (ccie2b@hotmail.com)
Date: Thu Mar 25 2004 - 12:11:57 GMT-3
Hi all,
When an ISDN circuit is configured as an OSPF demand-circuit to backup
another OSPF link in the same area, should and can any other backup method
such as Dialer Watch also be configured on the same ISDN link?
My sense is that there's no need to configure any other backup method and
doing so would only complicate things and lead to unexpected results.
Here's what I believes happens in such a situation (without 2nd method
configured).
Primary link goes down.
This causes ospf to see a topology change has occurred.
OSPF floods lsa over all links including ISDN circuit which brings up ISDN
circuit.
OSPF updates the route table to reflect new topology.
Now, user traffic that would have used the primary link now uses the ISDN
link.
Is this simplified chain of events correct? Are there other significant
things that occur that we should be aware of?
Thanks in advance, pm
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