Catalyst 3750 to 3560 via SFP

[colin.macphail]

Hi,

Could anyone tell me if I have a compatibility issue when connecting a Catalyst 3560 to a 3750 using a CAB-SFP-50CM cable?

Both switches have a C3KX-NM-1G network module fitted.

I used this cable to link 2 3560's with no problems, but when I try to use it on the 3750 I get an error saying that the port has been disbled because a non compliant gigabit interface converter has been detected.I'm only asuming that the CAB-SFP-50CM isn't compatible with the 3750.

I've got them connected via a RJ45 patchlead, but the SFP cable would look way cooler

Thanks in advance, Colin

[Richard Strnad · Accepted solution]

Hi Colin,

It sound as is this cable only compatible with a 3560.

I found this [1]:

SFP Module Patch Cable

The Catalyst 3560 switch supports the SFP module patch cable, a 1/2 meter, copper, passive cable with SFP module connectors at each end. The patch cable can connect two Catalyst 3560 switches in a cascaded configuration.

Part Number	Description
CAB-SFP-50CM=	Cisco Catalyst 3560 SFP Interconnect Cable (50 dcm)

[1] http://www.cisco.com/en/US/products/hw/switches/ps700/products_tech_note09186a00800a7af7.shtml

Regards

Richard

[Joseph W. Doherty]

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Posting

That special cable is supposed to only be used on 3560s, but I've wondered whether it might function with unsupported transceiver command.  Have you tried that?

[colin.macphail]

Thanks for that, it's kind of what I thought.

Colin