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OSPF failover implementation

Posted on 2012-04-10
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Last Modified: 2012-06-21
I have two WAN links and I'd like to implement failover primary and secondary connection with OSPF. Any tutorials or recommendations? Thx
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Question by:biggynet
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pergr earned 500 total points
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The only thing you need to do is to configure your metric on the two links, and OSPF will chose the one with the lowest metric as primary, and failover to the other link when the primary is down.

In case your primary link has a higher bandwidth, then this will be automatic - even without manually configuring the metric.

If it is high speed links, you may want to configure your "reference bandwidth" under OSPF. By default this is just 100 Mbps, which is not very useful these days. Better set it to 100 Gbps.

Then the metric for each link is automatically calculated as 100Gbps divided by the bandwdith for each link.

...and Bob's your uncle.
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