[149025] in North American Network Operators' Group
Re: 10GE TOR port buffers (was Re: 10G switch recommendaton)
daemon@ATHENA.MIT.EDU (Saku Ytti)
Fri Jan 27 11:56:08 2012
Date: Fri, 27 Jan 2012 18:55:15 +0200
From: Saku Ytti <saku@ytti.fi>
To: nanog@nanog.org
In-Reply-To: <CAEs2ZiLWOqqd1TNj0syf5STTyf9DfSO0Y5ynj=LPNrhR=ONtVw@mail.gmail.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
On (2012-01-27 17:35 +0100), bas wrote:
> Chassis:
> Juniper EX8200-8XS 512MB/10GE
> Cisco WS-X6708-10GE 32MB/10GE (or 24MB)
> Cisco N7K-M132XP-12 36MB/10GE
> Arista DCS-7548S-LC 48MB/10GE
> Brocade BR-MLX-10Gx8-X 128MB/10GE (not sure)
>
> 1GE aggregation.
> Force10 S60 1250MB shared
> HP 5830 3000MB shared
I'd take some of these with grain of salt, take EX8200-8XS, PDF
indeed does agree:
---
Total buffer size is 512 MB on each EX8200-8XS 10-Gigabit
Ethernet port or each EX8200-40XS port group, and 42 MB
on each EX8200-48T and EX8200-48F Gigabit Ethernet port,
providing 50-100 ms of bandwidth delay buffering
---
However 512MB is about 400ms of buffering, while 512Mb is 50ms. So I think
JNPR PDF is just wrong.
Similar error may exist for some other quoted numbers.
But generally nice list, especially the 10GE fixed config looked realistic,
sometimes I wish we'd have 'dpreview' style page for routers and switches,
especially now with dozen or more vendors selling 'same' trident+ switch,
differentiating them is hard.
--
++ytti
