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Replacement Unit Added To Stack Has POE Admin Status Enabled Current Status Disabled

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TitleReplacement Unit Added To Stack Has POE Admin Status Enabled Current Status Disabled
Symptoms
  • Unit 3 in stack stopped passing traffic
  • Unit 3 was manually reset while in stack and during boot failed Test 301 POE
Screen capture of Test 301 POE Contact Failed
  • Unit 3 was removed from stack and replaced with spare
  • New switch added as unit 3 came up in stack with POE current status disabled (admin status was enabled)
ERS#show poe-port-status 3/1-50

******************************************************************************
Command Execution Time: 2020-01-10 09:48:58 GMT-05:00 UTC time: 2020-01-10 14:48:58
******************************************************************************
Unit Admin Current Limit Power-up
Port Status Status Class (Watts) Priority Mode
---- ------- ----------------- ----- ------- -------- -----------
3/1 Enable Disabled 0 32 Low 802.3at
3/2 Enable Disabled 0 32 Low 802.3at
3/3 Enable Disabled 0 32 Low 802.3at
3/4 Enable Disabled 0 32 Low 802.3at
3/5 Enable Disabled 0 32 Low 802.3at
3/6 Enable Disabled 0 32 Low 802.3at
3/7 Enable Disabled 0 32 Low 802.3at
3/8 Enable Disabled 0 32 Low 802.3at
3/9 Enable Disabled 0 32 Low 802.3at
3/10 Enable Disabled 0 32 Low 802.3at
  • Resetting unit 3 did not change POE port status
  • Factory defaulting unit 3 did not change POE port status
  • Another switch added to position 3 in same stack exhibited same symptoms of all ports having POE current status disabled
Environment
  • ERS 5900
  • Release 7.7.1
Cause
  • When original unit 3 switch was booted while in stack and had POST failure in POE this caused impact to stack internal task that manages POE port status for unit 3
Resolution
  • Rebooting the stack alleviated this condition and all POE ports came up properly as current status detecting
Additional notes

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