Good question.

On our Brocade XMRs we have the choice of about 18 different CAM partition profiles.

We have chosen one named ipv4-ipv6-2.

Whilst this gives us 768k ipv4 routes and 64k ipv6 routes it also gives us 64k MAC or VPLS MAC entries. We don't actually use the later on these routers but its the best CAM profile for our needs.

The other two we could have picked were multi-service-4 (764k ipv4, but only 32k ipv6 (and other types of routes)) or ipv4 profile (1m ipv4...)

Short story we should have picked ipv4-ipv6-2 a long time ago but mistakes and assumptions were made.

If anyone is interested all of this is on page 2626 of the Brocade NetIron manual :)

Cheers
Dave



On Thu, Aug 14, 2014 at 12:25 PM, Geoff Huston <gih@apnic.net> wrote:
On 14 Aug 2014, at 6:59 am, Dave Mill <davemill@gmail.com> wrote:

> We've moved to 764k v4 and 64k v6 on our two 'problem' routers.
>
> Again, a reboot was required to change the CAM around.

If the unit could support 1M V4 or 512K V6 or any combination of the two, then what have you done with the remaining ~128K 32 bit TCAM entries? (i.e. why didn't you set the V6 size to 128K or the V4 size to ~872K entries?)

(I'm just curious about the maths here! ;-))

�� ��Geoff