DFE f/w 6.12.01.0007 PoE Clients Intermittently Reset

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Article ID: 11744 

Products
Matrix N-Series DFE, firmware 6.12.01.0007 through 6.12.02.0003
PoE modules, part# xxxxx5-xx 

Symptoms
Power over Ethernet (PoE) clients periodically restart due to a brief PoE power interruption.
Such events affect all PoE clients on the same DFE port banks.
For each event, diagnostic messages appear in the Fault Log (5101), syslog, and 'show logging buffer' output for the affected DFE module. 

For example, here are logging buffer messages from slots 2-5 of one system, for one day: 

<163>Apr 8 06:33:15 10.20.183.251 i2c[2.tPoEPwr]i2cWriteReadPOE: status: -1 - Unable to transmit data to POE 1
<163>Apr 8 07:30:25 10.20.183.251 PdPoE[2.tPoEPwr]poeAccessUpdate (chipset 0): System status 2 get failed.
<163>Apr 8 11:57:58 10.20.183.251 PdPoE[3.tPoENotify]poePortStatusUpdate (chipset 0): Get ports 0-10 status failed.
<163>Apr 8 14:51:23 10.20.183.251 i2c[3.tPoENotify]i2cWriteReadPOE: status: -1 - Unable to transmit data to POE 1
<163>Apr 8 14:51:48 10.20.183.251 PdPoE[3.tPoENotify]poePowerThresholdUpdate: pdPoEGetModuleCalculatedPower() failed.
<163>Apr 8 08:22:32 10.20.183.251 PdPoE[4.tPoENotify]poePortCountersUpdate (chipset 0): Get ports 0-23 detection failure counters failed.
<163>Apr 8 10:31:25 10.20.183.251 System[5]PoE controller is not accessible. 

Solution/Workaround
Upgrade to firmware 6.12.03.0003 or higher. 

Release notes state, in the 'Firmware Changes and Enhancements' section:
POE
Power Over Ethernet (POE) may not be delivered to groups of 48 or 24 ports for brief periods of time. This is the result of an error in software which communicates with the microcontroller responsible for POE management. Attached POE powered equipment will power cycle and reset when this happens.
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Posted 5 years ago

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