3560 SFP Interconnect Cable - question

[robert.jubb]

If i have 3 x 3560s do i need 3 cables

- . connect one to each other then the top one to the bottom one - like the 3750s stacking stacks -- or is it just one cable between each device no cable between top and bottom

[Leo Laohoo]

3560 cannot be stacked. 

[Joseph W. Doherty]

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Posting

Depends whether you're trying to provide redundancy.  You can create a ring with 3 cables and 3 3560s; you'll need to run some variant of STP to block one of the links.

PS:

BTW, depending on the actual model, you can use copper cables between copper ports or perhaps the special 50cm 3560 SFP Interconnect Cable between gig SFP ports.

[darren.g]

robert.jubb@kcom.com wrote:
If i have 3 x 3560s do i need 3 cables 
- . connect one to each other then the top one to the bottom one - like the 3750s stacking stacks -- or is it just one cable between each device no cable between top and bottom

What are you trying to do?

If you want to simply extend VLAN's across the switches to add more ports, then just link one switch (primary) to each of the other with a trunk which includes the VLAN's you want to appear on the other switches, create the appropriate VLAN's on the other two swiches, and you should be good to go.

If you want to form a "chassis" or simgle virtual switch - you can't. 3560's don't support stacking, and therefore will always appear as three distinct individual switches.

If you want to make redundancy, you could make a ring design,  - switch one links to switch two, switch two links to switch three, switch three links back to switch one - but you'd need to watch for spanning-tree issues, because one of the paths would have to be in blocking mode to stop loops.

Cheers.