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TOS and DSCP mapping

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    IP Precedence(3 bits) DSCP(6 bits)
    Name Value Bits Per-Hop
    Behavior
    Class
    Selector
    Drop
    Precedence
    Codepoint
    Name
    DSCP Bits
    (decimal)
    DSCP
    Value
    TOS
    Value
    TOS
    Hex
    Network
    Control
    7 111         111000 56~63 224 0xE0
    Internetwork
    Control
    6 110         110000 48~55 192 0xC0
    Critical 5 101 EF     EF 101110 46 184 0xB8
    101000 40 160 0xA0
    Flash Override
    Video Data
    4 100 AF 4 3: High AF43 100110 38 152 0x88
    2: Medium AF42 100100 36 144 0x90
    1: Low AF41 100010 34 136 0x98
    Flash Voice
    Control
    3 011 AF 3 3: High AF33 011110 30 120 0x78
    2: Medium AF32 011100 28 112 0x70
    1: Low AF31 011010 26 104 0x68
    Immediate 2 010 AF 2 3: High AF23 010110 22 88 0x58
    2: Medium AF22 010100 20 80 0x50
    1: Low AF21 010010 18 72 0x50
    Priority 1 001 AF 1 3: High AF13 001110 14 56 0x28
    2: Medium AF12 001100 12 48 0x30
    1: Low AF11 001010 10 40 0x38
    Best Effort 0 000 Default(BE)     Default(BE) 000000 0 0 0x00

    * DSCP Value愈大, 則優先權愈高. BE是默認的預設值, 無視任何優先順序.

    CS7或著CS6應用於一些強制性的網路協定, 這些網路協定必須保障優先權, 否則session會被迫引發中斷, 通常在hardware queue乃最高優先權, 例如OSPF, BGP等.

    企業保障的鑽石級業務可以放置在AF4或著EF層級上, 考量業務操作的優先性.

    基於WME標準的QoS分類為: BE, Background, Video, Voice; 4 queues排程.

    ID 802.1p COS TOS Range DSCP Range WME Category
    0 Best Effort 0x00-0x1F 0-7 BE(Application)
    1 Background 0x20-0x3F 8-15 BG
    2 Spare 0x40-0x5F 16-23 BG
    2 Excellent Effort 0x60-0x7F 24-31 BE(Application)
    4 Controller Load 0x80-0x9F 32-39 Video
    5 Video(<100ms latency) 0xA0-0xBF 40-47 Video
    6 Video(<10ms latency) 0xC0-0xDF 48-55 Voice
    7 Network Control 0xE0-0xFF 56-63 Voice
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