OSPF - Automatic Failover of links

Unanswered Question
Jun 21st, 2007


Plz Advice...

As per the attached Diagram ; I want to have automatic failover of WAN links between my Primary site to DR site.

AT PRI both the links are terminated on single Router and DR the links are terminated on different routers

I want to use OSPF in this scenario..

can u help with advice and sample configuration.

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Paolo Bevilacqua Thu, 06/21/2007 - 00:49


OSPF should work fine for this. The only problem is that you will have problem balancing the traffic over the two circuit of different speed.

Hope this helps, please rate post if it does!

Amin Shaikh Thu, 06/21/2007 - 01:01

To load balance and failover should I use


since my network is running all OSPF then I need to advertize EIGRP into OSPF correct

Paolo Bevilacqua Thu, 06/21/2007 - 01:07


EIGRP will NOT load balance over links of unequal speed. Even if it is written in the manual, does not work in practice and there are no know real networks using that feature.

You best choice is either to upgrade links to same speed, or manually balance based on traffic flow that you know.

Else try to set them to same metric and hope things won't go wrong.

Amin Shaikh Thu, 06/21/2007 - 01:23


Can you help me to get Cisco Link sample config to accomplish my task.

Paolo Bevilacqua Thu, 06/21/2007 - 01:29

Actually since you have OSPF already running is just a matter of having the "network" statements in the routers and nothing else.

You can use a single area zero for all the routers.

Your reference would be "configuring ospf" in the manual, and if you want to understand the theory, a good book on routing.

Amin Shaikh Thu, 06/21/2007 - 04:29

Thanks for your reply.

Which is the good book on Routing you are refering too.


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