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From: Stefan Fouant <sfouant () shortestpathfirst net>
Date: Fri, 12 Aug 2011 08:46:38 -0400

On 8/12/2011 8:40 AM, James Jones wrote:
I would not say ISIS is the prefered protocol. Most service providers I have worked with use OSPF. Most networks 
outside of the US use it from what I have seen and the larger SPs in the US do too. There must be a reason for that.

Actually, i strongly disagree with this statement. A good majority of the Tier-1 Service Providers that I have worked with in the past used IS-IS, I think in large part due to the points mentioned earlier. I know for a fact that in the late 90s, when we were transitioning from an ATM core to an MPLS core at UUnet, we selected IS-IS largely due to the fact that it supported MPLS Traffic Engineering extensions before comparable support was available in OSPF, and the main reason for this was due to the fact that IS-IS was TLV based.

Stefan Fouant
Technical Trainer, Juniper Networks

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