[c-nsp] changing from ospf to eigrp

[Ben Steele]

What you are doing is known as "ships in the night routing" where you  
run multiple protocols that are unaware of each other, I would go  
ahead and deploy your EIGRP config while keeping your OSPF running and  
as someone else has mentioned the default admin distance for EIGRP is  
90 which will take precedence over your 110 OSPF, bare in mind if you  
use redistributed routes in EIGRP they will show up as admin distance  
of 170 though.

Either way just go from router to router deploying your EIGRP and then  
when your happy you've done all your devices go and check your route  
tables to see what OSPF routes are still showing up and then determine  
why, and if they are needed, as EIGRP obviously isn't seeing them (at  
least from a non redistributed PoV).

OSPF will pick up your slack while you deploy this in the above  
method, the only real danger I see is if you a) miss a router or b)  
fail to check the route tables for remaining OSPF routes after full  
EIGRP migration before turning OSPF off.

Ben

On 05/04/2008, at 12:30 PM, Whisper wrote:

> So long as the OSPF network remains intact until the EIGRP network  
> is up and
> running, OSPF should effectively operate as a backup route in the  
> cases
> where EIGRP has no route, correct?
>
> It'd it be like running a floating static route, except your using a  
> dynamic
> routing protocol, wouldn't it?
>
> On Sat, Apr 5, 2008 at 10:52 AM, Jeremy Stretch <stretch at packetlife.net 
> >
> wrote:
>
>>> Can I run both at the same time?
>>
>> If you do, you may want to consider tweaking the administrative
>> distances until EIGRP has been fully implemented across the network.
>> Remember, by default EIGRP has an AD of 90 (internal) and OSPF of  
>> 110,
>> so EIGRP-learned routes will be preferred. This has the potential to
>> cause problems if EIGRP is misconfigured or only partially enabled
>> during migration.
>>
>> stretch
>> http://www.packetlife.net/
>>
>> Dan Letkeman wrote:
>>> Hello,
>>>
>>> I would like to change our layer 3 switches from ospf to eirgrp.  Is
>>> there a way I can accomplish this on a live system without causing
>>> problems?  Can I run both at the same time?
>>>
>>> Thanks,
>>> Dan.
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