[59054] in North American Network Operators' Group
Re: IPv6
daemon@ATHENA.MIT.EDU (E.B. Dreger)
Fri Jun 13 01:01:25 2003
Date: Fri, 13 Jun 2003 05:00:44 +0000 (GMT)
From: "E.B. Dreger" <eddy+public+spam@noc.everquick.net>
To: North American Noise and Off-topic Gripes <nanog@merit.edu>
In-Reply-To: <003c01c33167$9623b1a0$c0ee0b0a@force10networks.com>
Errors-To: owner-nanog-outgoing@merit.edu
SS> Date: Thu, 12 Jun 2003 23:48:18 -0500
SS> From: Stephen Sprunk
SS> Most L3 switches shipping today (e.g. the product in question) have
SS> particular ethertypes and destination address offsets hardcoded into their
SS> ASICs. It's not a matter of supporting 128-bit addresses -- they simply
SS> doesn't understand IPv6's header any more than they do DECnet or AppleTalk.
Yes...
SS> While allocation policies may have an effect on how IPv6 FIBs are most
SS> efficiently stored, address length is a fairly small part of the problem
...but there's no sense making the tries more unwieldy than they
need to be.
SS> when you're talking about redesigning every ASIC to handle both IPv4 and
SS> IPv6.
Less redesign required if reusing the existing IPv4 lookup.
Eddy
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