IPv6

Fri Jun 13 05:00:44 UTC 2003

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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