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7100-Series InDiscards with low traffic

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Title7100-Series InDiscards with low traffic
Symptoms
  • In InDiscards errors with low ingress traffic in the port.
Environment
  • 7100-Series
  • all firmware versions.
Cause
 In 7100-Series prior to version 8.22.02 or in the default buffer mode(flow-control) packets are discarded on the ingress port when there is a congestion in the corresponding egress port and therefore they are counted as InDiscards. 
Resolution
  1. Monitor port usage in the remaining ports to find potentially congested ports.
  2. From version 8.22.02 you can change default behaviour and drop congested packets at the egress port. To do that change the buffer mode to priority-groups
set port buffer mode priority-groups
Additional notes
This command causes a quick interruption "hiccup" in traffic.

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