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Re: Misconceptions, was: IPv6 RA vs DHCPv6 - The chosen one?
From: Tony Li <tony.li () tony li>
Date: Thu, 29 Dec 2011 12:17:35 -0800


On Dec 29, 2011, at 2:27 AM, Vitkovsky, Adam wrote:

... host systems should participate in IGP

We tried that.

It didn't scale well.

The Internet today is very different than the Internet in 1981.

-did you? I thought CLNS with plethora of ip addresses compared to ipv4 was buried before it could be widely 
deployed, I was not around back than but would like to know why ES-IS did not scale well when integrated IS-IS is 
still used primarily for great scalability 


???

CLNS carried NSAPs, not IP addresses.  

ES-IS was the protocol between hosts and routers, very much akin to ARP.  IS-IS was the IGP used for CLNS.  Yes, it's 
the same one that we use today for IP.  Even in the ISO model, hosts did not participate in IS-IS.

There was no particular scalability problem with ES-IS, other than the mcast burden that it imposed on the link layer.  
This is not radically different than the burden that ARP broadcasts require.  Limit your broadcast domains.

Tony



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