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  • 1.  QFX 5xxx interface queue size

     
    Posted 08-18-2022 06:02
    Dear community

    I'm currently playing with telemetry to find the root-cause of microburst. I have successfully set up Telegraf, influxdb and grafana.  I have 3 grafh that shows bandwidth rate, drop packet and buffer occupancy. But for the last one i didn't find in Juniper documentation and Junos CLI the max buffer size of each interface queue. So I don't know what is the maximum peak.

    I do have the Junos command "show interfaces queue xe-0/0/47 buffer-occupancy " but filed "Queue-depth bytes" s empty :

    BoSS@QF5120> show interfaces queue xe-0/0/47 buffer-occupancy 
    Physical interface: xe-0/0/47, Enabled, Physical link is Up
      Interface index: 663, SNMP ifIndex: 527
      Description: M1:DC2REP010:Xe-0/0/47:L3
    Forwarding classes: 12 supported, 5 in use
    Egress queues: 12 supported, 5 in use
                Queue: 0, Forwarding classes: best-effort
                    Queue-depth bytes  :
                    Peak               : 1787344
                Queue: 3, Forwarding classes: fcoe
                    Queue-depth bytes  :
                    Peak               : 0
                Queue: 4, Forwarding classes: no-loss
                    Queue-depth bytes  :
                    Peak               : 0
                Queue: 7, Forwarding classes: network-control
                    Queue-depth bytes  :
                    Peak               : 416
                Queue: 8, Forwarding classes: mcast
                    Queue-depth bytes  :
                    Peak               : 208
    

    Do you how or where can I retrieve this value ?

    Also is the "Peak" value in bytes ? Packets ?

    How can i change the Queue-depth value on QFX5xxx ?

    Thanks

    Salah

    ------------------------------
    Salah
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  • 2.  RE: QFX 5xxx interface queue size

     
    Posted 08-19-2022 09:08
    Someone can help please ?

    ------------------------------
    Salah
    ------------------------------



  • 3.  RE: QFX 5xxx interface queue size

     
    Posted 08-22-2022 03:51
    last try.... please

    ------------------------------
    Salah
    ------------------------------



  • 4.  RE: QFX 5xxx interface queue size

     
    Posted 08-22-2022 09:54
    please help.... last try.... (error duplicate)

    thank you

    ------------------------------
    Salah
    ------------------------------



  • 5.  RE: QFX 5xxx interface queue size

    Posted 30 days ago
    I am not a SME .. but hope this may be of some use to you.

    https://www.juniper.net/documentation/us/en/software/junos/cos/topics/ref/statement/queue-depth-edit-interfaces.html
    https://supportportal.juniper.net/s/article/MX-Example-Queue-depth-calculation-on-Next-Generation-XQ-based-cards?language=en_US

    In this example, CIR and PIR are configured under the TCP so CIR will be used to calculate buffer-size (queue-depth).
    Note: When using XQ, buffer-size 1568 bytes is not enough to handle traffic when sending packets larger than 784 bytes (1568/2).
    On XQ, buffer-size should be configured to a value at least 2x MTU.

    Buffer-size in bytes = guaranteed-rate in bps * minimum burst size in ms * buffer size in percent/8000