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Re: subnet prefix length > 64 breaks IPv6?
From: sthaug () nethelp no
Date: Wed, 28 Dec 2011 20:46:48 +0100 (CET)

IPv6 CEF appears to be functioning normally for prefixes longer than
64-bit on my 720(s).

I'm not seeing evidence of unexpected punting.

The CPU utilization of the software process that would handle IPv6
being punted to software, "IPv6 Input", is at a steady %0.00 average
(with spikes up to 0.02%).

So there would seem to be at least one major platform that is OK.

And there are other platforms, e.g. Juniper M/MX/T, where there is no
concept of "punt a packet to software to perform a forwarding decision".
The packet is either forwarded in hardware, or dropped. IPv6 prefixes >
64 bit are handled like any other IPv6 prefixes, i.e. they are forwarded
in hardware.

Steinar Haug, Nethelp consulting, sthaug () nethelp no


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