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Cisco Bug: CSCvu71960 - Priority Flow Control: PFC not configured on IOM 2408 interfaces

Last Modified

Jul 02, 2020

Products (1)

  • Cisco Unified Computing System

Known Affected Releases

4.1(1)

Description (partial)

Symptom:
Extremely high amount of RX discards on the FI Server interfaces (i.e. 532178 input discard).

Server interfaces seeing increased RX discards as well as FC aborts.
PFC not seeing any frames on those interfaces
Light traffic, only 3 Servers operational, 1 ESXI Host, and 7 VMs.
Only one of the IO Modules is affected (IOM-1)

Conditions:
UCS 6454
2408 IOM

Examples of working vs non-working interfaces


Non-Working:

Ethernet1/17 
    Admin Mode: Auto
    Oper Mode: Off 
    VL bitmap:           
    Total Rx PFC Frames: 0         
    Total Tx PFC Frames: 0  

--------------------------------------------------

Ethernet1/24 
    Admin Mode: Auto
    Oper Mode: Off 
    VL bitmap:           
    Total Rx PFC Frames: 0         
    Total Tx PFC Frames: 0   

==================================================

Working:

Ethernet1/17 
    Admin Mode: On  
    Oper Mode: On  
    VL bitmap: (8)       
    Total Rx PFC Frames: 340524    
    Total Tx PFC Frames: 76254 

---------------------------------------------------

Ethernet1/24 
    Admin Mode: On  
    Oper Mode: On  
    VL bitmap: (8)       
    Total Rx PFC Frames: 302446    
    Total Tx PFC Frames: 72434
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