While the concept of classes has changed, I'm not so sure that I agree with the complaint here... Everything I've seen about the multi TLA/SLA concepts always seem to leave 64 bits at the end for the actual host address, so it would be a logical step at that point to have the ASICs spun so that 64 bits was the limit for routing tables. Perhaps I have had the same assumption/misunderstanding that the programmer guys have had then?!?!? Scott -----Original Message----- From: owner-nanog@merit.edu [mailto:owner-nanog@merit.edu] On Behalf Of bmanning@vacation.karoshi.com Sent: Saturday, November 20, 2004 9:56 PM To: Kevin Oberman Cc: crist.clark@globalstar.com; Lars Erik Gullerud; Stephen Sprunk; North American Noise and Off-topic Gripes Subject: Re: Stupid Ipv6
Just to introduce a touch of practicality to this discussion, it might be worth noting that Cisco and Juniper took the RFC stating that the smallest subnet assignments would be a /64 seriously and the ASICs only route on 64 bits. I suspect that they influenced the spec in this area as expending them to 128 bits would have been rather expensive.
darn... and we fought so hard last time we had to expunge classfull addressing asics/hardware in the late 1990s. looks like it crept back into vendor gear. IPv6 was -never- supposed to be classful. --bill