Cisco Catalyst 5000 Series Switches

Field Notice: Erroneous Messages Sent to MCP from CPU Every 49 Days, 17 Hours, and 3 Minutes

November 1, 1998

Products Affected

  • WS-C5500

  • WS-X5530-E1

  • WS-X5530-E2

Problem Description

This rare problem (described in Cisco bug ID CSCdk32229) is found only on Catalyst 5xxx switches equipped with Supervisor IIIs (WS-X5530-E1 and WS-X5530-E2). The Supervisor III may reset a line card after 49 days, 17 hours, and 3 minutes of uptime, or can reset the supervisor module itself. The type of reset causes a card to come back on line in a "faulty" state. A manual line card reset is needed to resume normal operation.

If you are a registered CCO user and you have logged in, you can view bug details.

View bug details for CSCdk32229 (registered customers only) .


This problem was recognized because of the increased processor speed of the Supervisor III.

Problem Symptoms

When the system uptime of a Catalyst 5xxx switch reaches 49 days, 17 hours, and 3 minutes, a burst of control messages may be erroneously sent from the Network Management Processor (NMP) to the Master Control Processor (MCP) located on the Supervisory Module.

In chassis equipped with a Supervisory Module III, this may lead to unexpected resets of line cards, including ATM cards. Line cards may also change to a "faulty" state during normal operations. Another symptom that may be experienced is an "MCP exception" error, leading to a reset of the Supervisory Module III.


This problem is fixed in Catalyst software releases 3.2(3) and 4.2(1). These versions of software can be downloaded from Cisco's web site at:

Catalyst 2900/5xxx Software Images

A workaround for customers prior to software releases 3.2(3) and 4.2(1) is to manually reset the switch once before the System Uptime reaches 49 days, 17 hours, and 3 minutes.

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: