Bandwidth - Line cards

Unanswered Question
Apr 20th, 2007

What does the term bandwidth when used with respect to a line card mean?is it the pipe available for data transfer between ports on the same line card?also what is a non-blocking architecture?

I have this problem too.
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Jon Marshall Fri, 04/20/2007 - 01:41


Bandwidth on line cards usually refers to how much throughput exists between the line card and the main switching fabric of the chassis. So for example on the 6500 switch a WS-6724-SFP has a 20Gb dedicated connection to the switch fabric.

The WS-6724-SFP supports 24 x 1Gb ports so there will be some contention on the ports. If you use only 20 of the 24 ports then in effect the blade is non-blocking as 20 ports = 20Gbps and the blade has a dedicated 20 Gbps connection to the switch fabric.

Some of the modules that go into a 6500 do not have dedicated connections to the switch fabric. Instead they use a shared connection to the switch fabric which could well lead to contention depending on the number of blades sharing this connection.



sumesh_un Fri, 04/20/2007 - 03:59

thnks jon

main switching fabric I suppose is the entire data bus for the switch...


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