Load Balancing into OSPF

Unanswered Question
Sep 25th, 2007

I have 2 E1 Lines with different services providers. How can i load balance between to links using ospf? Is there any configuration needed?

I have this problem too.
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Richard Burts Tue, 09/25/2007 - 08:21

jayesh

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.

HTH

Rick

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