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MIgrate from EIGRP to OSPF

Posted on 2010-09-24
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Last Modified: 2012-05-10
Most of our network is set to OSPF routing... A small portion is still set to EIGRP... We would like to complete the process. Curently our core switch/router is running both protocols... Should I put both on the remaining routers and then take eigrp off???
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Question by:axl13
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rfc1180 earned 250 total points
ID: 33755260
>Curently our core switch/router is running both protocols... Should I put both on the remaining routers and then take eigrp off???

Personally, I would deploy OSPF and EIGRP in parallel. Once you have the routing protocols deployed on all routers, the next logical step would be to then compare OSPF database and EIGRP database. If the contents of the two database match and you are satisfied with the contents of the database you can start remove the EIGRP process on one router at a time. Also, take note of any manual redistribution that you might have as you might have to tag the routes depending on how complex the topology is.

Billy
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by:Don Johnston
ID: 33755269
>Should I put both on the remaining routers and then take eigrp off???

If you want a no interruption migration, that's what I would do.
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by:mikebernhardt
mikebernhardt earned 250 total points
ID: 33756683
What I would do instead of trying to compare databases, which will be very confusing and difficult: Change the administrative distance of EIGRP to 130
router eigrp 1
 distance 130

What this will do is make OSPF (distance 120) more preferable than EIGRP (normally 90). When you type "show ip route" all of your routes should end up being in OSPF. If you still see some in EIGRP, that means that you missed something in OSPF.

Once you've cleaned up what's missing you can safely remove EIGRP.
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Author Closing Comment

by:axl13
ID: 33769776
THanks for all your help
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