01-17-2009 02:21 PM - edited 03-06-2019 03:29 AM
01-17-2009 04:27 PM
Backplane or fabric speed noted for many Cisco switches in the attachment.
01-17-2009 04:27 PM
01-21-2009 02:33 PM
Question: Ratings for the 2940-8 are 2,700,000 and 3.2 and for the 2960-8 are 2,700,000 and 16. The performance is the same but the fabric is different. Is the 2960 faster? What do these ratings mean?
01-21-2009 02:41 PM
Switch fabric is the actual backplane speed of the switch so if you had a 24 port 10/100/1000 switch with a 16Gbps switch fabric then if all ports were running at 1Gbps that would be
24 x 1Gbps = 24Gbps
switch fabric = 16Gbps
so you could get contention between the ports and the switch would not run at wirespeed for all ports. If however you had a 24 port switch with a 32Gbps switch fabric
24 x 1Gbps = 24Gbps
switch fabric = 32Gbps
so all ports could run at wirespeed and there would be no contention.
Hope this makes sense.
Jon
01-21-2009 02:49 PM
I think i understand. So for the 2940-8, (8 x 100Mbps)+(1 x 1 Gbps) = 1.8 Gbps. So with the fabric at 3.2Gbps you could never overload the switch, right? If so then the 2960-8 with a fabric of 16 just has more headroom, right?
01-21-2009 02:59 PM
"If so then the 2960-8 with a fabric of 16 just has more headroom, right?"
Yes correct. Because of the switch architecture you will find that some switches models within the same swith family where family is 2960 or 3560 etc. have more switch fabric than they need.
Jon
01-17-2009 09:07 PM
thanks
Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community: