From: Nancy Khln (nancy_merill@yahoo.com)
Date: Sun Jan 18 2004 - 22:09:51 GMT-3
Hi,
I have three Cisco 2500 routers using the network setup in the diagram below:
RoA-------ISDN-----RoB
| /
| S1
| /
| /
| /
Frame relay /
| /
| /
| /
Se1 /
| S0
RouterC/
Requirement: I need to configure ISDN as a back up for the Frame Relay.
Cannot use static, backup and dialer watch in the ISDN section. All ip addreses involved in this scenario must be reachable.
OSPF is running over the frame relay connection between Ra/Rc, Rc/Rb the Frame connection and across the ISDN link Ra/Rb.
, 2 parallel path exists between Ra and Rb, by configuring OSPF demand circuit
on the ISDN link and making sure that the ISDN link has a higher cost OSPF path between the 2 routers, I am using the ISDN link only when
a prefix cannot be reached over the Frame Relay link. When the Frame relay link between Ra/Rc, or Rc/Rb goes down, OSPF demand circuit kicks in and
the ISDN link comes up.
So far so good, everything is working. What if I want to bring up the ISDN link only when the frame relay link between
Ra and Rc is down, same requirements but I want to monitor only one frame relay link. Now the OSPF demand feature doesn help.
What do I need to do to implement this?
Thank you
Nancy
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