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Meaning of "[bcmDPC]unit 0 WRED_THD_1_CELL entry 182 parity error" log message

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TitleMeaning of "[bcmDPC]unit 0 WRED_THD_1_CELL entry 182 parity error" log message
Question
What is the meaning of "[bcmDPC]unit 0 WRED_THD_1_CELL entry 182 parity error" log message?
Environment
  • Summit X460 switch
  • EXOS 15.3.1.4
Answer
The above logs suggest this is parity in the L3 table which handles and stores the Layer 3 interface as well route information. These error messages are reported by a process called bcmDPC.
The bcmdpc process is a hardware level process. DPC stands for deferred procedure call. The bcmdpc task is responsible for handling queued procedures. When the switch experiences a h/w parity error, the routine responsible for correcting these errors is failing to work properly and causing continuous error messages to be printed in the Broadcom shell as below:


"[bcmDPC]unit 0 WRED_THD_1_CELL entry 182

In other word WRED_THD_1_CELL is a table memory that is used for provisioning WRED thresholds.  Assuming customer do not have wred configuration (configure qosprofile wred), it would not impact switch operation.

 
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