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tokenmt (7)
  • >> tokenmt (7) ( Solaris man: Макропакеты и соглашения )
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    NAME

    tokenmt - Single and Two Rate Three Conformance Level Meter
     
    

    DESCRIPTION

    The tokenmt module can be configured as a Single or a Two Rate meter. Packets are deemed to belong to one of the three levels - Red, Yellow or Green - depending on the configured rate(s) and the burst sizes. When configured as a Single Rate meter, tokenmt can operate with just the Green and Red levels.

    Configuration parameters for tokenmt correspond to definitions in RFC- 2697 and RFC- 2698 as follows:

    Configuring tokenmt as a Single Rate meter (from RFC- 2697):
    committed_rate - CIR
    committed_burst - CBS
    peak_burst - EBS

    (thus 'peak_burst' for a single rate meter is actually the 'excess burst' in the RFC. However, throughout the text the parameter name "peak burst" is used.)

    Configuring tokenmt as a Two Rate meter (from RFC- 2698):
    committed_rate - CIR
    peak_rate - PIR
    committed_burst - CBS
    peak_burst - PBS

    The meter is implemented using token buckets C and P, which initially hold tokens equivalent to committed and peak burst sizes (bits) respectively. When a packet of size B bits arrive at time t, the following occurs:

    When operating as a Single Rate meter, the outcome (level) 
    is decided as follows:
           - Update tokens in C and P
                 o Compute no. of tokens accumulated since the 
                   last time packet was seen at the committed rate as
                   T(t) = committed rate * (t - t')
                   (where t' is the time the last packet was seen)
                 o Add T tokens to C up to a maximum of committed burst 
                   size. Add remaining tokens ((C+T) - Commited Burst),
                   if any, to P, to a maximum of peak burst size.
           - Decide outcome
                 o If not color aware
                         o If B <= C, outcome is GREEN and C -= B.
                         o Else, if B <= P, outcome is YELLOW and P -= B.
                         o Else, outcome is Red.
                 o Else,
                         o obtain DSCP from packet
                         o obtain color from color_map, color_map[DSCP]
                         o if (color is GREEN) and (B <= C), outcome is 
                           GREEN and C -= B.
                         o Else, if (color is GREEN or YELLOW) and
                           (B <= P), outcome is YELLOW and  P -= B.
                         o Else, outcome is RED.
        Note that if peak_burst and yellow_next_actions are 
        not specified (that is, a single rate meter with two 
        outcomes), the outcome is never YELLOW.
    

    When operating as a Two Rate meter, the outcome (level) is decided as follows:

    - Update tokens in C and P
                     o Compute no. of tokens accumulated since the last time a
                       packet was seen at the committed and peak rates as
                       Tc(t) = committed rate * (t - t')
                       Tp(t) = peak rate * (t - t')
                       (where t' is the time the last packet was seen)
                     o Add Tc to C up to a maximum of committed burst size
                     o Add Tp to P up to a maximum of peak burst size
                - Decide outcome
                     o If not color aware
                           o If B > P, outcome is RED.
                           o Else, if B > C, outcome is YELLOW and P -= B
                           o Else, outcome is GREEN and C -= B & P -= B
                     o Else,
                           o obtain DSCP from packet
                           o obtain color from color_map, color_map[DSCP]
                           o if (color is RED) or (B > P), outcome is RED
                           o Else, if (color is YELLOW) or (B > C),
                             outcome is YELLOW and P -= B
                           o Else, outcome is GREEN and C -= B & P -= B
    

     

    STATISTICS

    The tokenmt module exports the following statistics through kstat:

    Global statistics:

    module: tokenmt                          instance: <action id>
     name: tokenmt statistics               class <action name>
           epackets                         <number of packets in error>
           green_bits                       <number of bits in green>
           green_packets                    <number of packets in green>
           red_bits                         <number of bits in red>
           red_packets                      <number of packets in red>
           yellow_bits                      <number of bits in yellow>
           yellow packets                   <number of packets in yellow>
    

     

    FILES

    /kernel/ipp/sparcv9/tokenmt

    64-bit module (SPARC only.)

     

    ATTRIBUTES

    See attributes(5) for descriptions of the following attributes:

    ATTRIBUTE TYPEATTRIBUTE VALUE

    AvailabilitySUNWqos

     

    SEE ALSO

    ipqosconf(1M), dlcosmk(7ipp), dscpmk(7ipp), flowacct(7ipp), ipqos(7ipp), ipgpc(7ipp), tswtclmt(7ipp)

    RFC 2697, A Single Rate Three Color Marker J. Heinanen, R. Guerin --- The Internet Society, 1999

    RFC 2698, A Two Rate Three Color Marker J. Heinanen, R. Guerin --- The Internet Society, 1999


     

    Index

    NAME
    DESCRIPTION
    STATISTICS
    FILES
    ATTRIBUTES
    SEE ALSO


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