Question: can you use 1gb sfp in 10gb port?
Answer: For the issue of SFP to SFP+ compatibility, a simple answer is that most SFP+ can take SFP but not vice versa. Thus 10G SFP+ optics on 10Gb switch port is possible to link to 1G gigabit switch port when 1Gb SFP modules are plugged into each port.