Re: Naive IPv6 (was AT&T UVERSE Native IPv6, a HOWTO)

[Brian Dickson <brian.peter.dickson () gmail com>]

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