RE: WS-X6148A-GE-TX performance question

["Crooks, Sam" <Sam.Crooks () experian com>]

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] 
> Sent: Thursday, September 10, 2009 4:40 PM
> To: Scott Spencer
> Cc: nanog () 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.
>
> -b
>
>
> On Thu, Sep 10, 2009 at 2:17 PM, Scott Spencer 
> <scott () 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.
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>
>
> --
> Bill Blackford
> Network Engineer