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Alternate port doesn't become active in failover

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TitleAlternate port doesn't become active in failover
Symptoms
  • Slow RSTP/MSTP failover 
  • Root port remains as root port even after  the  link is down
  • Alternate port doesn't become root 
Environment
  • N-Series
  • Firmware 07.62.09 or earlier.
Cause
RSTP/MSTP Topology with  adminpath costs have been configured and port has link loss, a new port role is not immediately calculated.If this is a root port, it will remain root port until some other event causes a root election, which could take several tens of seconds. 
Resolution
Upgrade to firmware version 7.62.10.0001
Additional notes

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