WS-X6148A-GE-TX performance question
Sam.Crooks at experian.com
Thu Sep 10 21:58:52 UTC 2009
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 at gmail.com]
> Sent: Thursday, September 10, 2009 4:40 PM
> To: Scott Spencer
> Cc: nanog at nanog.org
> Subject: Re: WS-X6148A-GE-TX performance question
> There was a good thread on Cisco-nsp regarding this exact
> 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
> difference between these LC's is that X6148A will support
> large MTU whereas X6148 will not.
> On Thu, Sep 10, 2009 at 2:17 PM, Scott Spencer
> <scott at dwc-computer.com>wrote:
> > Are the X6148A cards dedicated 1 gb/s uplink for each port
> ( shared
> > 32 Gb/s bus , as long as each port is it's own 1 gb/s still to the
> > 32gb/s bus and not shared with 7 other ports, so effectively just
> > 125Mb/s per port then if all used at full/even capacity) ?
> > I can't really find anything much on X6148A internal architecture
> > online, but it would seem that each port gets its own 1gb/s link to
> > the card/backplane, and that the bottleneck then is the 32gb/s
> > backplane (which is fine, as long as it's not 1 gb/s per
> each set of 8 ports!).
> > Best regards,
> > Scott Spencer
> > Data Center Asset Recovery/Remarketing Manager Duane Whitlow & Co.
> > Inc.
> > Nationwide Toll Free: 800.977.7473. Direct: 972.865.1395 Fax:
> > 972.931.3340
> > <mailto:scott at dwc-computer.com> scott at dwc-computer.com
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> > Cisco/Juniper/F5/Foundry/Brocade/Sun/IBM/Dell/Liebert
> > and more ~
> Bill Blackford
> Network Engineer
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