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How to set 802.1p priority? RRS feed

  • Question

  • Hi All,

    How to set 802.1p priority value, that is carried in Virtual Local Area Network (VLAN) tag.

    Monday, July 27, 2015 6:59 AM

Answers

  • Hi,

    EEE 802.1p was specified by an IEEE 802.1 Task Group to address traffic prioritization for Quality of Service (QoS). 802.1p is not a separate IEEE 802.1 standard, but is defined in Annex G of the IEEE 802.1Q-2005 standard.

    IEEE 802.1p defines a 3-bit field called the Priority Code Point (PCP) within an IEEE 802.1Q tag. For NDIS packets, the 802.1p PCP value is specified by the UserPriority member of the NDIS_NET_BUFFER_LIST_8021Q_INFO structure that is associated with a packet's NET_BUFFER_LIST structure.

    The PCP value defines 8 priority levels, with 7 the highest priority and 1 the lowest priority. The priority level of 0 is the default. Each priority level defines a class of service that identifies separate traffic classes of transmitted packets.

    For more information about this value

    IEEE 802.1p Priority Levels

    https://msdn.microsoft.com/ja-jp/library/hh451379(v=vs.85).aspx

    QoS Protocols section

    https://technet.microsoft.com/en-us/library/cc728211(v=ws.10).aspx

    Regards,

    D. Wu


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    Thursday, July 30, 2015 7:26 AM