Symptom

C9400 16.6.4 Sup and line card may get into faulty state (show mod) after reload, if high CPU kicks in during POST. High CPU can be triggered by "copy start run", but it may not be limited to just this command. We do not see any issue if the high CPU kicks in after POST. Root/cause is different from CSCvj94357, as we don't see any policer drops here. A reload of switch can recover from faulty state, not a bad hardware. Two issues we see here that need to be addressed by this defect- > "copy startup-config running-config" causing high CPU > "show module" shows all cards status as "OK", even though the cards are still booting up. Mod Ports Card Type Model Serial No. ---+-----+--------------------------------------+--------------+-------------- 1 48 48-Port UPOE 10/100/1000 (RJ-45) C9400-LC-48U JAE214302NR 2 48 48-Port UPOE 10/100/1000 (RJ-45) C9400-LC-48U JAE214204MV 3 10 Supervisor 1 Module C9400-SUP-1 JAE214201FL 6 48 48-Port UPOE 10/100/1000 (RJ-45) C9400-LC-48U JAE214204M5 7 48 48-Port UPOE 10/100/1000 (RJ-45) C9400-LC-48U JAE214204N3 Mod MAC addresses Hw Fw Sw Status ---+--------------------------------+----+------------+------------------+-------- 1 6CB2.AE42.AD8C to 6CB2.AE42.ADBB 1.0 16.6.2r[FC1] 16.06.04 faulty 2 6CB2.AE42.6D78 to 6CB2.AE42.6DA7 1.0 16.6.2r[FC1] 16.06.04 ok 3 2C5A.0F1C.E0AC to 2C5A.0F1C.E0B5 1.0 16.6.2r[FC1] 16.06.04 faulty 6 6CB2.AE42.87D0 to 6CB2.AE42.87FF 1.0 16.6.2r[FC1] 16.06.04 ok 7 6CB2.AE42.81A0 to 6CB2.AE42.81CF 1.0 16.6.2r[FC1] 16.06.04 ok Mod Redundancy Role Operating Redundancy Mode Configured Redundancy Mode ---+-------------------+-------------------------+--------------------------- 3 Active active sso ! POST: MBIST Tests : Begin POST: MBIST Tests : End, Status Passed POST: Module: 3 PHY Loopback: loopback Test: Begin POST: PHY Loopback: Failed For Interface : TenGigabitEthernet3/0/1 POST: PHY Loopback: Failed For Interface : TenGigabitEthernet3/0/5 POST: Module: 3 PHY Loopback: loopback Test: End, Status Failed POST: Module: 7 PHY Loopback: loopback Test: Begin POST: Module: 7 PHY Loopback: loopback Test: End, Status Passed POST: Module: 2 PHY Loopback: loopback Test: Begin POST: Module: 2 PHY Loopback: loopback Test: End, Status Passed POST: Module: 6 PHY Loopback: loopback Test: Begin POST: Module: 6 PHY Loopback: loopback Test: End, Status Passed POST: Module: 1 PHY Loopback: loopback Test: Begin POST: PHY Loopback: Failed For Interface : GigabitEthernet1/0/2 POST: PHY Loopback: Failed For Interface : GigabitEthernet1/0/3 POST: Module: 1 PHY Loopback: loopback Test: End, Status Failed

Conditions

High CPU while the switch is running POST. There is NO drops in CPU policer - sh pl hard fed active qos queue stats internal cpu policer

Workaround

A reload of switch can recover from faulty state. Avoid running any command on switch while running POST after reload, that can trigger high CPU.

Further Problem Description