The problem is. when insert the transceivers into the SFP+ ports in both switches and connect the cables the line seems dead.
Additionally, when I go 'Status and Statistics>Diagnostics>Optical Module Status' I don't see the transceiver listed (on either switch)
Another point - currently both SFP+ on both switches are set to stacking mode (as they are stacked to one other switch each). I plan on changing this and stacking these switches through an Ethernet port with a CAT6.A connection but I would still expect to see the Optical Transceiver listed in the 'Status and Statistics>Diagnostics>Optical Module Status'
I think that both "SFP-10G-LR-S" or "SFP-10G-LR" should work fine. I also checked the Cisco compatibility matrix and both are listed there as compatible as long as you are running 18.104.22.168 or a later version. Here is the link to the list:
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