Cisco MDS 9000 Series Multilayer Switches

November 18, 2008

NOTICE:

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE OR WARRANTY, INCLUDING THE WARRANTY OF MERCHANTABILITY. YOUR USE OF THE INFORMATION ON THE FIELD NOTICE OR MATERIALS LINKED FROM THE FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.

Revision History

Revision	Date	Comment
1.0	18-NOV-2008	Initial Public Release

Products Affected

Products Affected
M9100 - DS-C9124-K9
M9100 - DS-C9134-K9
MDS9000 - DS-HP-FC-K9
MDS9000 - DS-IBM-FC-K9
MDS9000 - DS-X9222I-K9

Problem Description

After 497 days of uptime the switch may restart due to a software defect. This problem is intermittent and may not happen every time. If the switch is running SAN-OS 3.3(2), NX-OS 4.1(1b) or above software, the switch is not vulnerable to this issue.
In order to determine if your switch is at risk, enter the show system uptime command to identify how long the switch has been up.

MDS-9124# show system uptime
System start time: Sat Sep 20 14:50:31 2008
System uptime: 6 days, 22 hours, 25 minutes, 15 seconds
Kernel uptime: 6 days, 22 hours, 26 minutes, 18 seconds
Active supervisor uptime: 6 days, 22 hours, 25 minutes, 15 seconds
MDS-9124#

Entering the show logging onboard command will identify the card uptime. In this example it is just over 497 days.

Thu Sep 25 19:09:33 2008: Card Uptime Record
----------------------------------------------
Uptime: 42946218, 497 days 1 hour(s) 30 minute(s) 18 second(s)
Reset Reason: Unknown (0) Card Mode..........................: Runtime

This problem is resolved in SAN-OS 3.3(2) and NX-OS 4.1(1b).

Background

The data field for the switch uptime has a maximum of 497 days before it will roll over to zero. If the process that handles the roll over takes more than ten seconds, the switch will restart.

Problem Symptoms

The switch may restart due to a failure of the system to respond quickly enough when the uptime counter reaches 497 days.

Workaround/Solution

By scheduling a planned restart of the switch or upgrading to either SAN-OS 3.3(2) or NX-OS 4.1(1b) it is possible to avoid this issue. In addition, if a switch was upgraded to any prior version of SAN OS, the system uptime would have been reset to zero.

DDTS

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

DDTS	Description
CSCsu80534 (registered customers only)	9124 Reboots itself after 497 days

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:

• Open a service request on Cisco.com
• By email
• By telephone

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