At 08:27 AM 5/31/01 -0400, R. Benjamin Kessler wrote:
>What is the reason for going to OSPF in this instance, stability problems
>with EIGRP or multi-vendor support?
>
>In my experience people seem to view EIGRP as "easier" than OSPF - while
>probably true in really small networks, networks these days just seem to be
>getting bigger and the same planning required for a successful OSPF
>implementation is required for EIGRP. I haven't seen too many companies
>with all-Cisco routers and a healthy EIGRP network looking to change
>things - thus the question above.
Well, a few points I would bring up is.
Stuck in Active problem of EIGRP. As the updates are being done, the
routers will stay in "active" mode (cannot receive new updates I
believe). If the EIGRP network is big, it must wait for the very last
router in the periphery to respond back. This could cause issues with
convergence time. You may have to modify the timers to increase the hold
time (which might cause bad convergence) since genuine requests might take
so long that they will get "zonked" out and the the router will delete it's
entry. This only happens in huge "AS" (in the EIGRP sense of an area of
sorts). So, if the idea of using OSPF and breaking into "areas" is bad,
you technically get the same issue with EIGRP, except in the form of ASes.
Also, you are running a proprietary protocol now. Although it seems to
work fine now. If say, they feel another vendor's product is superior in a
particular aspect of their network, they might be hard pressed or you will
need to do some redistribution/distribution lists which is probably going
to be difficult as well.
I suppose all in all it is still "easier" to use EIGRP. I agree
wholeheartedly with your statements. The cost of going to OSPF might seem
higher if they are really not that good with it. In that way it somewhat
validates them sticking to EIGRP.
-Carroll Kong
Message Posted at:
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