[117365] in North American Network Operators' Group
RE: WS-X6148A-GE-TX performance question
daemon@ATHENA.MIT.EDU (Crooks, Sam)
Thu Sep 10 18:00:01 2009
Date: Thu, 10 Sep 2009 16:58:52 -0500
In-Reply-To: <680a83090909101439t36cc0596w3af1863117a1fd56@mail.gmail.com>
From: "Crooks, Sam" <Sam.Crooks@experian.com>
To: "Bill Blackford" <bblackford@gmail.com>,
"Scott Spencer" <scott@dwc-computer.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
the other difference between WS-X6148-GE-TX and WS-X6148A-GE-TX is the A
has better QoS queuing potential (more hardware queues available) and a
lower list price...
As I recall, there are 6 ethernet controllers with 8 ports on each...
(8:1 oversubscription among the adjacent ports in a port group which use
the same ethernet controller).
The card is a Classic card, so the whole card is limited to 32 Gbps to
the backplane, which given the oversubscription ratio, shouldn't be much
of an issue...
> -----Original Message-----
> From: Bill Blackford [mailto:bblackford@gmail.com]=20
> Sent: Thursday, September 10, 2009 4:40 PM
> To: Scott Spencer
> Cc: nanog@nanog.org
> Subject: Re: WS-X6148A-GE-TX performance question
>=20
> There was a good thread on Cisco-nsp regarding this exact=20
> subject recently.
> My recollection is that both X6148 and X6148A have just 6 1GB ASICs.
> Therefore the over subscription rate is 8:1. The biggest=20
> difference between these LC's is that X6148A will support=20
> large MTU whereas X6148 will not.
>=20
> -b
>=20
>=20
> On Thu, Sep 10, 2009 at 2:17 PM, Scott Spencer=20
> <scott@dwc-computer.com>wrote:
>=20
> > Are the X6148A cards dedicated 1 gb/s uplink for each port=20
> ( shared=20
> > 32 Gb/s bus , as long as each port is it's own 1 gb/s still to the=20
> > 32gb/s bus and not shared with 7 other ports, so effectively just=20
> > 125Mb/s per port then if all used at full/even capacity) ?
> >
> > I can't really find anything much on X6148A internal architecture=20
> > online, but it would seem that each port gets its own 1gb/s link to=20
> > the card/backplane, and that the bottleneck then is the 32gb/s=20
> > backplane (which is fine, as long as it's not 1 gb/s per=20
> each set of 8 ports!).
> >
> >
> > Best regards,
> >
> > Scott Spencer
> > Data Center Asset Recovery/Remarketing Manager Duane Whitlow & Co.=20
> > Inc.
> > Nationwide Toll Free: 800.977.7473. Direct: 972.865.1395 Fax:
> > 972.931.3340
> > <mailto:scott@dwc-computer.com> scott@dwc-computer.com=20
> > <http://www.dwc-it.com/> www.dwc-it.com Sales of new and used=20
> > Cisco/Juniper/F5/Foundry/Brocade/Sun/IBM/Dell/Liebert
> > and more ~
> >
> >
>=20
>=20
> --
> Bill Blackford
> Network Engineer
>=20
