Stackwise cables on 3750

Answered Question
May 4th, 2010

All,

There's something peculiar about what I read in an article on Cisco's site, and I'm wanting to get clarification:

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/prod_white_paper09186a00801b096a.html

The bottom part in this article under Figure 10: Local Switching, indicates that Stackwise doesn't locally switch, but Stackwise+ does. It *sounds* like if I send traffic from port 3/2 to port 3/23, it's going to circle the ring before getting to the port. Am I reading this right? Stackwise+ is only available on the 3750-E switches, and I have 3750-G.

Thanks,

John

Correct Answer by Jon Marshall about 6 years 9 months ago

j.blakley wrote:

oooo...look at the badge Congrats!

The article looks like it goes against everything a switch is supposed to do for port-to-port traffic....now you have traffic traversing the stack cable needlessly.....

John

Thanks for the congrats, still can't get used to seeing it each time i log in

Does seem to be a bit counterintuitive but i can't see any other way of reading it.

Jon

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Jon Marshall Tue, 05/04/2010 - 09:10

j.blakley wrote:

All,

There's something peculiar about what I read in an article on Cisco's site, and I'm wanting to get clarification:

http://www.cisco.com/en/US/prod/collateral/switches/ps5718/ps5023/prod_white_paper09186a00801b096a.html

The bottom part in this article under Figure 10: Local Switching, indicates that Stackwise doesn't locally switch, but Stackwise+ does. It *sounds* like if I send traffic from port 3/2 to port 3/23, it's going to circle the ring before getting to the port. Am I reading this right? Stackwise+ is only available on the 3750-E switches, and I have 3750-G.

Thanks,

John

John

I just read the whole article and have come to the same conclusion as you ie. with Stackwise because it does not support local switching and because it uses soruce stripping even a packet destined for a port on the same switch has to go right round the stack ring. Odd but that's what it is saying. I'll do a bit more digging but i think you are right in this.

Jon

John Blakley Tue, 05/04/2010 - 09:15

oooo...look at the badge Congrats!

The article looks like it goes against everything a switch is supposed to do for port-to-port traffic....now you have traffic traversing the stack cable needlessly.....

Correct Answer
Jon Marshall Tue, 05/04/2010 - 09:51

j.blakley wrote:

oooo...look at the badge Congrats!

The article looks like it goes against everything a switch is supposed to do for port-to-port traffic....now you have traffic traversing the stack cable needlessly.....

John

Thanks for the congrats, still can't get used to seeing it each time i log in

Does seem to be a bit counterintuitive but i can't see any other way of reading it.

Jon

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