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:bblackf...@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 > <sc...@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:sc...@dwc-computer.com> sc...@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 >
