Hi Robert,

> ** I am very sceptical that the leader from vendor X will always work 
> smoothly with all boxes from vendors Y, Z, W, Q … 


Again, leader election is derived from DIS election, so this begs the question: 
are you skeptical of DIS election?  Do you have interoperable IS-IS on LANs 
today?

If your skepticism reaches to the centralized flooding topology algorithm, then 
I’ll point out that the interoperability issue is the ability to follow the 
leader’s directions. That should not be difficult.

If your skepticism is about a distributed flooding topology algorithm, then I 
agree. We have yet to demonstrate interoperability of any distributed algorithm 
more complex than SPF, and the proposed flooding topology algorithms are a bit 
more complex than that. I would welcome a multi-vendor example of this working, 
but until then, I also am concerned.

Regards,
Tony



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