SFP Negotiation

Question: I have an SFP gbic port in a Cisco 6509 switch with supervisor 720 which does not come up. i checked the cable (fiber) and changed the gbic but it did not help. What should I do next?

Answer:

When a port with a SFP module does not come up and you are sure about the cable and connections always check the speed negotiation and even disable it by:

speed nonegotiate

interface command.