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Procurve/Provision: ILLEGAL 802.1Q VLAN tagging

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  • 1.  Procurve/Provision: ILLEGAL 802.1Q VLAN tagging

    Posted Mar 06, 2018 01:15 PM


    Page 251:   "Override "illegal" packet priorities set by upstream devices or applications that use 802.1Q VLAN tagging 802.1p priority tags."

    What are "illegal" packet priorities?

    More importantly:  How does one OVERRIDE them?


    Thanks in advance.


  • 2.  RE: Procurve/Provision: ILLEGAL 802.1Q VLAN tagging

    Posted Mar 08, 2018 12:36 AM

    For example, you might have a user who ius running a video-conferencing software app on their desktop, and that software might allow the user to set his own DSCP/IP precedence vlues on the packets generated from that software. The user might think, "Ha, I'm going to set everything to the max so I get full priority". You then have the potential issue of 

     - voice and video traffic flooding the highest-priority, very low-bandwidth, switch queue which is designed to carry critical network messaging>
     - video traffic flooding the priority, low-bandwidth, queue designed to carry voice.

    The document you are reading describes how you override those bad values:
    1/ identify the traffic type using access lists
    2/ use classifiers to match access-list matches to classes
    3/ use policy actions to assign values as per the identified classification.
    The policy action would identify, as an example,
     - voice RTP traffic and assign it ip precedence "6" ("5" in a mixed vendor network), DSCP EF(46)
     - video traffic "5" and AF41(34)
     - media signalling "3" and AF31(26)
     - default traffic "0" and BE(0)

  • 3.  RE: Procurve/Provision: ILLEGAL 802.1Q VLAN tagging

    Posted Mar 08, 2018 07:27 AM

    For simplicity, to force the "ILLEGAL" traffic to HPE's Q3 (802.1p - priotiy = 0), would I set all traffic other than voip and video to Q3  similar to the examples listed below????

    VLAN   111

    qos priority 0


    VLAN   222

    qos priority 0


    VLAN   333

    qos priority 0



    Thank you.