[160749] in North American Network Operators' Group
Re: switch 10G standalone TOR, core to DC
daemon@ATHENA.MIT.EDU (Nick Hilliard)
Tue Feb 12 10:46:15 2013
X-Envelope-To: nanog@nanog.org
Date: Tue, 12 Feb 2013 15:45:25 +0000
From: Nick Hilliard <nick@foobar.org>
To: Piotr <piotr.1234@interia.pl>
In-Reply-To: <511A506F.2050603@interia.pl>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On 12/02/2013 14:23, Piotr wrote:
> shared 9 MB packet buffer
> pool that is allocated dynamically to ports that are congested
>
> 9MB is a standard size of port buffers..
That's pretty standard for a cut-thru ToR switch of this style. Cut-thru
switches generally need a lot less packet buffer space than store-n-forward
switches. Also, ToR boxes tend not to have complex qos requirements.
Having said that, you need to be careful deploying small-buffer boxes. If
you're not careful, you will end up with bad packet loss.
Nick
