Tue, 09/25/2007 - 05:37
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Yes it is possible, however the cost must have the same, because OSPF does not support unequal cost load balancing (as opposed to EIGRP where you can set up the variance)


jayesh_netadmin Tue, 09/25/2007 - 05:48
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Thanks for que. is Is there any extra configuration needed?

jayesh Tue, 09/25/2007 - 05:53
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If both link have the same ospf cost you don't have to tune it.

If not the same you have to configure the interfaces to get same cost on both links.


Richard Burts Tue, 09/25/2007 - 08:21
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There is not any extra configuration required in OSPF to load balance over two links if the same prefix (same destination) is advertised over both links and if the OSPF metric is the same for both prefixes over both links. This is the default behavior of OSPF - it will by default load share when it has two equal cost paths to the same destination.

However I question whether you will be able to load share over 2 E1s when the E1s go to different providers. Will both providers be advertising the same prefixes (same destinations)? And will they advertise the prefixes with the same metric?

It seems to me that it would be easier to not worry about OSPF with the providers and to just run OSPF within your own network and to configure 2 default static routes, 1 to each provider, and to let the 2 static routes load balance, which they will do by default.




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