Can use SFP-H10GB-CU3M OR SFP-H10GB-CU5M to connect 6120XP to Cat6K Switch?
Yes, you can use SFP-H10GB-CU3M to connect 6120XP to Cat 6k, with the help of CVR-X2-SFP10G converter for X2 ports. This converter will convert existing X2 based 10G port on Cisco 6500 to SFP 10G interface.
if we don't have this connector, what kind of cable/connector should we use to connect a UCS6100 FI to a cisco switch?
Fiber cable + SFP 10GE on the nexus side and the other end of the fiber + X2 on the 6500 side