[167220] in North American Network Operators' Group
Re: Naive IPv6 (was AT&T UVERSE Native IPv6, a HOWTO)
daemon@ATHENA.MIT.EDU (Brian Dickson)
Wed Dec 4 16:01:02 2013
In-Reply-To: <CAL9jLaYqn1eR4otD6u4WXNEDsB39iggjS4txQYM9q7rzSWrPbA@mail.gmail.com>
Date: Wed, 4 Dec 2013 15:58:30 -0500
From: Brian Dickson <brian.peter.dickson@gmail.com>
To: Christopher Morrow <morrowc.lists@gmail.com>
Cc: NANOG list <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On Wed, Dec 4, 2013 at 3:48 PM, Christopher Morrow
<morrowc.lists@gmail.com>wrote:
> On Wed, Dec 4, 2013 at 3:43 PM, Brian Dickson
> <brian.peter.dickson@gmail.com> wrote:
> > Except that we have a hard limit of 1M total, which after a few 100K from
>
> where does the 1M come from?
>
FIB table sizes, usually dictated by TCAM size. Think deployed hardware,
lots of it.
(Most instances of TCAM share it for IPv4 + IPv6, with each slot on IPv6
taking two slots of TCAM, IIRC. And a few other things also consume TCAM,
maybe not as significantly.)
(Newer boxes may handle more on some network's cores, but I don't believe
it is ubiquitously the case across the DFZ.)
Brian
