Cisco WAN Switching Modules

September 19, 2001

Products Affected

Problem Description

The AUSM card resets due to a watchdog timeout. No other errors are logged. Customer traffic is interrupted.

Background

Two conditions must be met before the watchdog timeout occurs.

1. IMA groups are configured on the AUSM or IMATM card.

2. Statistics collection is enabled on the card.

Note: The AX-IMATM cards are used only on the MGX8220; they are currently not supported on the MGX8230, MGX8250 or MGX8850 systems.

Problem Symptoms

The AUSM resets and interrupts all user traffic. Network users will notice their sessions with remote resources time out or restart, depending on the application in use. Other symptoms include slow response or no response or lack of access to remote resources. Use the command dspcd to see the following telltale symptom of this anomaly.

ModuleSlotNumber: 2
?FunctionModuleState: Active
?FunctionModuleType: AUSM-8T1/B
?FunctionModuleSerialNum: 965652
?FunctionModuleHWRev: ab
?FunctionModuleFWRev: 10.0.20
?FunctionModuleResetReason: WatchDog timeout reset
?LineModuleType: LM-RJ48-8T1
?LineModuleState: Present
?mibVersionNumber: 26
?configChangeTypeBitMap: CardCnfChng, LineCnfChng
?cardIntegratedAlarm: Clear

Note: The phrase "Watchdog timeout reset" above.

Another symptom of this anomaly is that the command dspcderrs on the AUSM or IMATM does not showing any entries related to this reset.

In some instances, the AUSM or IMATM may be reset a second time due to firmware download failure (observed primarily when 1:N Redundancy is configured). In these instances, the telltale "Watchdog timeout reset" will be overwritten by the reset reason "Reset by PXM". Note that the presence of reset reason "Reset by PXM" alone, is not sufficient to prove that the AUSM or IMATM reset due to watchdog timeout, since the PXM may reset service modules for other reasons.

If the network has a Cisco WAN Manager station attached, the following event will also be captured in the trapd log:

...- MGX_NODE function module in 
slot 17 removed;...

This event alone merely indicates that the AUSM or IMATM was either reset or physically removed, or failed completely, and is not sufficient proof of a watchdog timeout.

Workaround/Solution

Upgrade to MGX Release 1.1.34 or MGX8220 Release 5.0.16

DDTS

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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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