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. Nationwide Toll Free: 800.977.7473. Direct: 972.865.1395 Fax: 972.931.3340 <mailto:scott@dwc-computer.com> scott@dwc-computer.com <http://www.dwc-it.com/> www.dwc-it.com Sales of new and used Cisco/Juniper/F5/Foundry/Brocade/Sun/IBM/Dell/Liebert and more ~
-- Bill Blackford Network Engineer