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subnet prefix length > 64 breaks IPv6?
- Subject: subnet prefix length > 64 breaks IPv6?
- From: sthaug at nethelp.no (sthaug at nethelp.no)
- Date: Wed, 28 Dec 2011 20:46:48 +0100 (CET)
- In-reply-to: <CALFTrnMxYzuBqbVK=PMgaVF-sATCfWF4zrrOAZ7XUOgVu5MiKQ@mail.gmail.com>
- References: <CALFTrnOPpJHhdpQLLZ5ZPWMQxoaWXcP=EBiFb-nT3FzHs2LAFA@mail.gmail.com> <06fa9147-3447-4e3d-9a8f-da53b409fca2@u32g2000yqe.googlegroups.com> <CALFTrnMxYzuBqbVK=PMgaVF-sATCfWF4zrrOAZ7XUOgVu5MiKQ@mail.gmail.com>
> 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 at nethelp.no