On some of the older models of the 3550 switches I was able to set the SFP interface to non-negotiate. I do not notice that command available in the documentation anymore. Does it still exist?
Do you have access to any of the switches in question? You can always use the context help under the interface
(config-if)#switchport ?
On my 3550 the nonegotiate is an option.
HTH
Regards,
James
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