I had an interesting conversation the other day regarding OSPF. I don’t want to give too much away, so here we go. This is the topology:

Assume interfaces have correct bandwidth statements and no cost commands have been added. R1 and R2 are redistributing the prefix as E2 with a cost of 100.

Which path does R4 take to the network? Does it load balance? Explain.

I started a thread on Networking-Forum on this as well. Post your answer here in the comments or over there.



Update: Here’s another question. What happens if we change it to:

Everything is the same except R2 is now redistributing as E1. Which path and why?


Colby Glass has been in IT since 2002. He is currently a Systems Engineer (presales) with a Cisco Gold partner and holds the CCNP R/S, CCNP DC, CCDP, CCIP, JNCIA-ER.

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