Cisco Catalyst 4000 Series Switches

Field Notice: Catalyst 4000 and 5000 Series With Redundant Supervisors Resets After The set summertime Command Time Ends

Revised November 5, 1998

Products Affected

  • WS-C5500

  • WS-X5530-E1

  • WS-X5530-E2

  • WS-X5509

  • WS-X4012

Problem Description

A problem has been discovered that causes the Catalyst 4000 and 5000 series product line to reset as a result of the change to Standard Time.


A Catalyst switch that is in a susceptible state for this problem may reset whenever a command such as show time or show ntp is issued. It may also happen whenever a Simple Network Management Protocol (SNMP) trap or a syslog message is generated by the Catalyst switch.

Any conditions that use the "get_clock" routine will cause or exaggerate this problem. The following commands may reset the Catalyst switch:

  • set summertime disable

  • set time

  • set ntp enable

  • show ntp

  • quit or autologout from the console (the time stamp is printed.)

Problem Symptoms

This failure condition may occur on any Catalyst 4000 or 5000 series that has all of the following:

  • NTP disabled

  • summertime enabled

  • dual Supervisors

  • no system reset or power-cycle after the the end of October change to Standard Time


The reset problem in the Catalyst switch software has been identified and a fix is being provided. The fix is scheduled to be available in version 3.2(4) and version 4.3(1) and will be included in all later releases.

An interim fix is that any Catalyst 4000 or 5000 series switch that meets the conditions for the failure (as described above) should be reset or power-cycled if the failure has not occurred. You should schedule the reset or power-cycle as soon as possible.

The steps below provide guidelines for the interim fix. You should use this procedure during a viable down time. Any activity, including these guidelines, that calls the Catalyst switch's internal clock routines may cause the reset problem.

  1. Look for any Catalyst 4000 or 5000 series switch that has redundant Supervisor IIs or Supervisor IIIs.

  2. Check the configuration to see if it meets the failure conditions. At the command line interface, type a show config command and check the NTP section to see if NTP is disabled and if summertime is enabled.

  3. Type a show log command on the active Supervisor.

  4. Check to see in the reboot history if the Catalyst 5000 series switch was reset on October 25, 1998 at 1:XX:XX and see if there is a crash dump pointing to this date. If the switch has been reset since October 25, 1998, there will not be another reset due to this issue until the end of October.

  5. If you see that the Catalyst 5000 series switch has already experienced a reset after the end of October at 1:00 AM, then this Catalyst 5000 series switch will not have the reset issue with the summertime command.

  6. If the Catalyst 5000 series switch was not reset and meets the failure criteria, this switch is susceptible to the reset problem and should be reset manually. Proceed to step seven. Otherwise, no further action is required.

  7. Make any necessary operational preparations and issue a reset system command or power-cycle the affected Catalyst 5000 series switch.

Bug Details

The problem's defect identification is CSCdk57762 (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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