2nd try: OSPF best path selection

From: Daniel Fredrick (dfredrick@gmail.com)
Date: Thu Oct 05 2006 - 15:27:13 ART

 OK... this seems like an easy question, but is difficult of find
documentation on it.

If you have a setup like the following...

(R4) (R3)
     \ /
       \ /
        (R5)

R4 and R3 are sending the same route to R5. On R5, they both have an equal
cost... so by default ospf on R5 will load balance across the two paths,
since the metric-type and metric are equal.

Now this is part that I cannot find documentation on...

If I go under the ospf process on R5 and set the maximum-paths to 1. Now
load balancing is disabled.

How does R5 determine which route to prefer? What if I change the Admin
distance for the routes coming from R4 to 100? Will that influence anything?

I noticed it goes by lowest-router ID... but is there some documentation on
this... or an order of steps that ospf will follow for the best path
selection?

Thanks,
Dan

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