cancel
Showing results for 
Search instead for 
Did you mean: 
cancel
3112
Views
0
Helpful
1
Replies
Highlighted
Beginner

%C4K_SWITCHINGENGINEMAN-3-PPECELLDUPDETECTED: Free cell duplicate(s) detected A59. System will be reset

Hi all,

We encounter this problem in the customer site. Can this thing be repaired or have fixes? Please help. Is it Supervisor Module already faulty and no way to be fix?

%C4K_SWITCHINGENGINEMAN-3-PPECELLDUPDETECTED: Free cell duplicate(s) detected A59. System will be reset

Thanks for your reply.

John

1 ACCEPTED SOLUTION

Accepted Solutions
Highlighted
Cisco Employee


Hi John,

"C4K_SWITCHINGENGINEMAN-3-PPECELLDUPDETECTED" prior to switch reboot indicates software has detected duplicate packet cell in PPE freelist memory. The PPE freelist tracks all free and available packet cells whose buffers can be used for incoming packets. Software detects cell duplication and resets the box to avoid corruption in the packet cell freelist. The decision to have the switch reset is done because duplicate cells on the freelist causes further freelist corruption resulting in weird packet processing behaviors, packet errors and packet buffer leaks which can eventually lead to stoppage of all packet switching through the box. For the ASIC on this SUP, duplicate cells can sometimes appear on the freelist as a result of a parity error in this memory. This has generally been found to be a very rare occurrence and was not found by development to occur more than once on any SUP. Thus, it is recommended that the switch be left running in a monitoring status. If the problem is seen further, it is likely the SUP is becoming faulty and would require replacement.

Regards,
Barun

View solution in original post

1 REPLY 1
Highlighted
Cisco Employee


Hi John,

"C4K_SWITCHINGENGINEMAN-3-PPECELLDUPDETECTED" prior to switch reboot indicates software has detected duplicate packet cell in PPE freelist memory. The PPE freelist tracks all free and available packet cells whose buffers can be used for incoming packets. Software detects cell duplication and resets the box to avoid corruption in the packet cell freelist. The decision to have the switch reset is done because duplicate cells on the freelist causes further freelist corruption resulting in weird packet processing behaviors, packet errors and packet buffer leaks which can eventually lead to stoppage of all packet switching through the box. For the ASIC on this SUP, duplicate cells can sometimes appear on the freelist as a result of a parity error in this memory. This has generally been found to be a very rare occurrence and was not found by development to occur more than once on any SUP. Thus, it is recommended that the switch be left running in a monitoring status. If the problem is seen further, it is likely the SUP is becoming faulty and would require replacement.

Regards,
Barun

View solution in original post

Content for Community-Ad