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Cisco Carrier Routing System

Field Notice: FN - 62271 - CRS-8: AC Power Supplies May Encounter Hang, Communication to the Power Supply is Lost - Workaround or RMA for Fix


Revised February 22, 2007
March 02, 2006


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.

Products Affected

Product Top Assembly Printed Circuit Assembly
Part # Rev. Part # Rev.
CRS-8-AC-RECT
800-25908-01
H0
341-0112-01
C0
CRS-8-AC-RECT=
800-25908-01
H0
341-0112-01
C0

Problem Description

CRS-8 AC power supplies occasionally lose communication capabilities due to an I2C hang. This happens in normal operating conditions when Power monitoring is enabled. Power monitoring is not enabled by default.

Background

Power Monitoring has been disabled as a default shipping configuration since first customer ship (FCS) of CRS-8. A few instances of the I2C hang occured after a few weeks under normal product operating conditions.

Problem Symptoms

Monitoring and communication with the power supply is hindered. The supply will continue to operate normally.

Sample error log:


RP/0/RP0/CPU0:crs#show log
Syslog logging: enabled (353 messages dropped, 0 flushes, 0 overruns)
Console logging: level informational, 15936 messages logged
Monitor logging: level debugging, 5404 messages logged
Trap logging: level informational, 0 messages logged
Buffer logging: level debugging, 21461 messages logged

Log Buffer (16384 bytes):

RP/0/RP0/CPU0:Oct 12 03:02:53.946 : i2c_server[57]: %PLATFORM-GT_I2C-3-BUS_UNHANG_SUCCESS : Successfully unhung the i2c bus
RP/0/RP0/CPU0:Oct 12 03:04:01.397 : i2c_server[57]: %PLATFORM-GT_I2C-6-BUS_HANG : Detected i2c bus hang, attempting to unhang the bus......
RP/0/RP0/CPU0:Oct 12 03:04:01.546 : i2c_server[57]: %PLATFORM-GT_I2C-3-UNRECOVERABLE_BUS_HANG : Detected i2c bus hang from which sw is unable to recover.
RP/0/RP0/CPU0:Oct 12 03:04:08.770 : i2c_server[57]: %PLATFORM-GT_I2C-3-BUS_UNHANG_SUCCESS : Successfully unhung the i2c bus
RP/0/RP0/CPU0:Oct 12 03:05:08.702 : i2c_server[57]: %PLATFORM-GT_I2C-6-BUS_HANG : Detected i2c bus hang, attempting to unhang the bus......
RP/0/RP0/CPU0:Oct 12 03:05:08.851 : i2c_server[57]: %PLATFORM-GT_I2C-3-UNRECOVERABLE_BUS_HANG : Detected i2c bus hang from which sw is unable to recover.

Workaround/Solution

Workaround: Perform online insertion and removal (OIR) of the power supply to reset communications.

Replace the affected hardware for a permanent solution.

As of approximately February 01, 2006 new products that were manufactured under Engineering Change Order (ECO) E084367 or deviation D082368 are free of this problem. Refer to How to Identify Hardware Levels below for instructions on how to view the version and deviation of in-service product.

Use Failure Code: Field Notice Alert (ARFN)

How To Identify Hardware Levels

Power Supplies 341-0112-02 and later or that have Deviation D082368 have the fix incorporated. 341-0112-01 does not have the fix incorporated.


RP/0/RP1/CPU0:CRS-2#show diag power-supply

Power Supply A :
MAIN: board type b00181
341-112-01 rev C0 //This version needs a Workaround or RMA
dev 076831 //Only dev 082368 has the fix
S/N TD10840J234
PCA: 0-0-00 rev 00
PID: CRS-8-AC-RECT
VID: V01
CLEI: IPP1D0WAAA
ECI: 129500






Revision History

Revision Date Comment
1.1
22-FEB-2007
Removed UMPIRE form and references to the form.
1.0
02-MAR-2006
Initial Public Release

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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