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RE: Backup and bandwidth-on-demand posted 10/27/2004
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I think the cost across both interfaces being higher than the backbone
route is best... But

Another option is setting BRI into an NSSA area, setup a static route
for the summarized networks and redistribute it into the NSSA.  Don't
know if that would work though...

HTH,

andy

-----Original Message-----
From: nobody@xxxxxxxxxxxxxx [mailto:nobody@xxxxxxxxxxxxxx] On Behalf Of
Geert Nijs
Sent: Wednesday, October 27, 2004 5:42 AM
To: ccielab@xxxxxxxxxxxxxx
Subject: Backup and bandwidth-on-demand


Hi group,
 
I have two routers R1 and R2 connected via a serial line and ISDN BRI,
both running OSPF Both routers R1 and R2 are also connected to a
backbone which runs OSPF. The ISDN BRI is configured to provide
bandwidth-on-demand with the backup interface and backup load commands.
So when the load is high, the BRI kicks in to help the serial line. This
works fine.
 
The OSPF costs over the serial line and BRI line are equal, so that load
balancing occurs when both lines are active.
 
However, in a failure scenario of the leased line, i don't want to run
exclusively over the BRI lines (half of the bandwidth). Actually, if the
leased line fails, i don't want BRI backup, but rerouting across the
backbone.
 
The problem is, that due to the backup interface command on the serial
line, in case of failure, the BRIs get activated immediatly and since i
am running a routing protocol over the BRIs, the BRIs become the
preferred route.
 
I can't change the cost over BRI since i'll have to change the cost over
the serial lines also (to keep them equal for load-balancing).
 
I have been breaking my head on this issue, but i cannot think of a
feature that Cisco provides to overcome this issue..... So if you have
any information, links, hints.....
 
 
Regards,
Geert
 
 
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