I work in a medium size facility that uses CISCO switches. I recently received 2 Linksys MGBSX1s to evaluate. Normally SFP GBICs are a commodity item. We use several vendors with no problem. When I plug the Linksys GBIC in I get these messages:
%LINK-5-CHANGED: Interface GigabitEthernet0/1, changed state to administratively down
%GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65537 has bad crc
%PM-4-ERR_DISABLE: gbic-invalid error detected on Gi0/1, putting Gi0/1 in err-disable state
%LINK-3-UPDOWN: Interface GigabitEthernet0/1, changed state to down.
Checking the the Cisco Site I find this info for the CRC message:
%GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR : GBIC in port [dec] has bad crc
Explanation The GBIC was identified as a Cisco GBIC, but it does not have a valid CRC in the EEPROM data.
Recommended Action Check to see if the Cisco IOS software running on the system supports the GBIC. If the GBIC is newer, a system software upgrade might be required. Even if the GBIC is unrecognized by the system, the GBIC may still operate properly but might have limited functionality.
I have updated my test switch to the most current level of IOS with no help.