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Our network has L3 connections from the core to most of our 25 buildings.  We have been using EIGRP but intend to move to OSPF for the IGP.  This *seems* pretty straightforward, but as in most things ...... depends.

I am wondering if others have done this and if there were any lessons learned the hard way, unforseen gotchas, or other useful information you learned along the way.  Have you made any tweaks that really help speed up convergence?  

Dennis Bohn
Manager of Network and Systems
Adelphi University
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Cisco has open sourced EIGRP so my question to you is, why would you move away from EIGRP?  You have the power of equal cost multipath (ECMP) and unequal cost load sharing.  That alone is a very powerful way to utilise multiple links in the network.

Anyway, just wondering why your planning the move.


Jeremy L. Gibbs
Systems Administrator / Network Engineer
Utica College IITS

T: (315) 223-2383
F: (315) 792-3814

Hi Jeremy,
First of all, let me say that EIGRP is a great routing protocol: the clever idea of a 'feasible successor' rocks and it converges quickly.  I know that they open-sourced it last February, but other vendors are (understandbly) not rushing to incorporate into their code.  I am not aware of any vendor other than Cisco currently implementing EIGRP.  At least if I understand things correctly, OSPF also does ECMP, though I think the convergance is a little slower and implementation not quite as easy.

What is driving the change is a commitment to a multi-vendor environment using the best solution at the best value with vendors using open standards to facilitate inter-operability.  At least that is the flavor of Kool-Aid that we are drinking this season ;-)


Dennis Bohn
Manager of Network and Systems
Adelphi University


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