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S-Series: Inserting replacement blade causes momentary disruption to network traffic

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TitleS-Series: Inserting replacement blade causes momentary disruption to network traffic
Symptoms
  • Installing new blade could cause momentary interruption to chassis traffic
  • Potentially causes STP topology changes
Environment
  • S-Series
  • Chassis based products
  • Firmware 7.xx
  • Firmware 8.11.xx
  • Firmware 8.22.xx
  • Installing new blade
Cause
The tNet0 (IP Stack) task could run too high momentarily during blade insertion causing traffic issues with protocols such as spanning tree and VRRP frames. Implemented a cpu rate limiter for this task to protect the system.
Resolution
Fixed in the below firmware versions:

Upgrade to 8.32.01 or higher 
Upgrade to 8.41.01 or higher 
Additional notes

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