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Eternal question: unequal cost load-balancing

It's amazing how many people have load-balancing-related issues. I get asked the same question over and over:
Is it possible to have unequal-cost load balancing with OSPF?

The answer is invariably: NO, you cannot do it with OSPF. However, you can use MPLS Traffic Engineering to establish two tunnels to the same remote OSPF router. Both tunnels will be used for all destinations reachable through the remote OSPF router (tunnel tail-end) even though OSPF selects only a single best path to it. A simple scenario is described in my IP Corner article “Perfect Load-Balancing: How Close Can You Get?

This article is part of You've asked for it series.


  1. This is why so many people fancy EIGRP. :)
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