From: Tim Last (packtmon@yahoo.com)
Date: Sat Apr 03 2004 - 18:17:02 GMT-3
Here's an idea.
Try configuring Frame Relay End-to-End Keepalives. Now, no matter where along the pvc there's a problem, the router will consider the interface down.
Ahmed Mustafa <ahmed.mustafa@sbcglobal.net> wrote:
R4 and R5 are connected via Frame-Relay and backup intereface via ISDN.
Here is the interesting situation. Both routers should have complete IP
reachibility incase either of their Frame-Relay interface goes down.
I took an approach to used backup interface for both routers.
For example,
r4
int s0
backup interface bri 0
r5
int s0
backup interface bri 0
I took the Frame-Relay interface down at R4 and since ICMP traffic was the
only interesting traffic I pinged the other side, but it timed out. I spent
little time to see why I can't ping the interface as I was able to ping it
before configuring the backup commands. I then realized ofcourse, I can't
because the other side's backup interface is down, and wouldn't come up until
I brought it down the s0 manually as well at the other site.
The moral of the story is in the real lab always eliminate the back interface
configuration if Lab asks youto back up both ends if either of the primary
interface goes down. The only way this could work if lab specifically states
that both primary interfaces go down at the same time.
Any thought?
Regards,
Ahmed
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