Windows PowerShell command on Get-command tokenmt
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Manual Pages for UNIX Operating System command usage for man tokenmt

IP Quality of Service Modules tokenmt(7ipp)

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 defini-

tions 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.

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IP Quality of Service Modules tokenmt(7ipp)

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:

name: tokenmt statistics class

epackets

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IP Quality of Service Modules tokenmt(7ipp)

green_bits

green_packets

red_bits

red_packets

yellow_bits

yellow packets

ATTRIBUTES

See attributes(5) for descriptions of the following attri-

butes:

__________________________________________________________________

| ATTRIBUTE TYPE | ATTRIBUTE VALUE |

|_____________________________|___________________________________|

| Availability | system/network/ipqos/ipqos-config |

|_____________________________|___________________________________|

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. Gue-

rin , The Internet Society, 1999.

SunOS 5.11 Last change: 12 Apr 2010 3




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