Other OSPF Features default gateway ( CCNP Encor )

Diego Klinkhamer

Hi everyone,

Just watched the videos about OSPF. i noticed 1 thing that isnt clear to me. The default gateway options that it can be tricky if you do it wrong, but how will OSPF handle 2 default gateways? Just like other router it calculates the best path? Or does OSPF have another trick for that?

Thanks in advance!

Anthony Sequeira

What an excellent question Diego! Congrats!

Yes, things get very interesting with multiple default gateways in OSPF! Yes - if the two different default routes have the same cost - they might get load balanced, but things can get weird fast!

For example, what if one of the default gateways is in a different area! Now you will not see load balancing by default because OSPF prefers intra-area routes over inter-area routes!

Yet another consideration here is the external metric type set in OSPF. Remember, you have two types. - a type where the cost through the local area is ignored, and a type where the cost is incremented as the route travels in the area.

OSPF is fun!