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Cisco Bug: CSCvt00457 - Egress FCOE traffic is misclassified in the default class (Level 3)

Last Modified

Oct 03, 2020

Products (24)

  • Cisco Nexus 9000 Series Switches
  • Cisco Nexus 9516 Switch
  • Cisco Nexus 9396PX Switch
  • Cisco Nexus 93108TC-FX Switch
  • Cisco Nexus 9396TX Switch
  • Cisco Nexus 93240YC-FX2 Switch
  • Cisco Nexus 93120TX Switch
  • Cisco Nexus 9372TX-E Switch
  • Cisco Nexus 93108TC-EX Switch
  • Cisco Nexus 9504 Switch
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Known Affected Releases

14.2(2f)

Description (partial)

Symptom:
Egress FCOE traffic is incorrectly classified in the default class (Level 3) instead of the no drop class (Level 1).  This issue causes priority flow control to not transmit pause frames to throttle the traffic during heavy congestion.  Level1 Rx Drop Pkts/Bytes will then result.

//Broken state
<pre> 
fab2-leaf105-FX# show queuing int e1/48
================================================================================
                        Queuing stats for ethernet 1/48
================================================================================
================================================================================
                        Qos Class level3
================================================================================
Rx Admit Pkts :  0                      Tx Admit Pkts :  1378051256          
Rx Admit Bytes:  0                      Tx Admit Bytes:  1454515271012       
Rx Drop Pkts  :  0                      Tx Drop Pkts  :  0                   
Rx Drop Bytes :  0                      Tx Drop Bytes :  0                   

//Working state
fab2-leaf105-FX# show queuing int e1/48 
================================================================================
                        Queuing stats for ethernet 1/48
================================================================================
================================================================================
                        Qos Class level1
================================================================================
Rx Admit Pkts :  0                      Tx Admit Pkts :  2757861840          
Rx Admit Bytes:  0                      Tx Admit Bytes:  2910880551448       
Rx Drop Pkts  :  542                    Tx Drop Pkts  :  0                   
Rx Drop Bytes :  34688                  Tx Drop Bytes :  0
</pre>

Conditions:
This issue occurs on the 4.2 release.
This issue does not occur on the 3.2 or 4.0 release.
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