Just migrated our DC from EIGRP to OSPF last weekend. We are having apparent issues when anything in the DC has a route change, then the entire OSPF route table refreshes. Is this typical behavior?
Our environment running OSPF in our DC (19 devices) is mostly 6509's with a handful of 7507/7513s. There are 2 WAN 75xx that are doing bidirectional redistribution into/out of EIGRP. Everything is in area 0.
When you redistribute routes into OSPF, that particular router becomes an ASBR. You can summarize these redistributed routes into OSPF on ASBRs and if a particular route (one of the redistributed and summarized) goes down, it will not affect the OSPF neighbors.
Ok, so this is my first time running OSPF! I've been told that when an intra-area route changes, the SPF algorithm runs and does a full refresh of the routes. As long as the traffic itself isn't affected, that's ok. I think we'll just need to break our area 0 up so that when area 0 actually does show a route refresh, that something happened that warrants investigation.
Worthy of note here is OSPF is a link-state protocol within a given area only! Behavior of inter-area communications is very much like distance vector. Hence, it's important to summarize on ABR and/or ASBR when possible.
It might be worthwhile to create an NSSA area for the routers doing redistribution from EIGRP, and make sure that those routers summarize the redistributed routes into OSPF.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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