Question: cisco sfp has bad crc?
Answer: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port [dec] has bad crc. This message means that the Gigabit Interface Converter (GBIC) module is identified as a Cisco GBIC module, but it does not have a valid cyclic redundancy check (CRC) in the EEPROM data.