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OSPF Redundancy

Posted on 2009-04-14
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Last Modified: 2012-05-07
I currently have a network ring comprised of 9 Catalyst 3560's.  they currently do spanning tree, and I place a "dead" link across my slowest link so that traffic all flows one direction until the ring is broke.  I want to migrate away from spanning tree, and use OSPF.  I already have OSPF in place, but traffic flows in all directions around the ring.  I realize that is the nature of OSPF, but is there some way I can make the link i don't want any traffic on look less attractive to OSPF so that it doesnt send any traffic down it at all unless another link is broke just like spanning tree?  I have tried messing with priorities and path costs with no avail.  is there someway i can make OSPF think there is more than 1 hop on a particular link?
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Question by:HunTelWebProgrammer
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by:JFrederick29
ID: 24138990
Using port cost on both ends of the slow link should take care of it.

ip ospf cost 1000000
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by:HunTelWebProgrammer
ID: 24139316
ok i set the max cost on the links and it appears to have helped.  in addition to this, when i replace these 3560's with 4948's and my uplinks change to 10Gig, is there something i need to do for OSPF to recognize the uplinks bandwidth of 10Gig as apposed to 1Gig? I thought i read somewhere that ospf can only determine bandwidth up to 1 gig unless additional configuration is done.
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JFrederick29 earned 2000 total points
ID: 24139355
Yup, you need to set the "auto cost" command on all OSPF routers.

router ospf 1
auto-cost reference-bandwidth 10000
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