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One port in LAG OPER up and other is dormant

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Information

 
TitleOne port in LAG OPER up and other is dormant
Symptoms
  • Intermittent loss of communication across a LAG
  • One port in LAG is OPer up One port in LAG shows dormant
  • single link LAG enabled
  • Port oper up not learning any MAC addresses
  • show port counters shows sent but no received traffic
  • Flipping the fiber connection caused port to transition to Oper down 
  • Moving the SFPP to a different port did not resolve
  • Swap the SFPP and the LAG forms  
Environment
  • S-Series
  • B5-Series
Cause
Bad SFP
Resolution
Additional notes

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