Cisco Catalyst 4000 Series Switches

Field Notice: G5484, G5486, G5487 GBICs Generate Bad EPROM Errors

Updated October 10, 2002 November 27, 2001

Products Affected




1000Base-SX GBIC


1000Base-LX/LH long haul GBIC


1000Base-ZX extended reach GBIC

Problem Description

The gigabit interface card (GBIC) modules WS-G5484, WS-G5486, or WS-G5487 appear to be operating normally but are reporting the following software errors:

%SYS-4-PORT_GBICBADEEPROM: port bad gbic eeprom checksum 
%SYS-4-PORT_GBICNOTSUPP: port gbic not supported

Problem Symptoms

The following software log errors are reported:



This is a cosmetic software problem only. Hardware should not be replaced.

The following available Catalyst software releases have fixed this problem when seeproms are available on the Cisco GBIC:

  • CatOS 5.5(5) and above

  • CatOS 6.2(4)and above

To upgrade your Catalyst software, please go to the Cisco LAN Switching Software Center (registered customers only) .

If a GBIC does not have a Cisco seeprom, then upgrading the Catalyst OS software will not fix the error message. In this case, the error indicates an older Cisco GBIC or a non-certified non-Cisco GBIC is in place.

Only Cisco certified GBICs can be replaced under a support contract or warranty. To verify the GBIC is a Cisco certified one, look at the label on the top of the GBIC case for the following items.

  • A Cisco logo.

  • Cisco part number starting with 30.

  • GBIC vendor name.


To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.



CSCds41239 (registered customers only)


For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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