NAME

DESCRIPTION

The most fundamental parameter is the traffic class. If the connection is bi-directional, both directions have the same traffic class. The traffic class is the first element in a QOS specification and the only required one. The following traffic classes are recognized:

ubr

Unassigned Bit Rate

cbr

Constant Bit Rate

If more parameters are supplied, the traffic class must be followed by a colon. Traffic parameters can be specified independently for the transmit and the receive direction. Their parameter lists are prefixed with tx: and rx:, respectively. If both parameter lists are present, the tx: list must precede the rx: list. If a parameter is equal for both directions, it can be placed in a common parameter list (without prefix). The general format is as follows:

class:common_list,tx:list,rx:list

Each list consists of elements specifying a parameter. Elements can appear in any order and they are separated with commas. The following elements are recognized:

pcr=rate

is a synonym for max_pcr=rate

max_pcr=rate

The upper limit for the peak cell rate to assign. If omitted, any rate up to link speed may be chosen.

min_pcr=rate

The lower limit for the peak cell rate to assign. If omitted, any rate above zero can be chosen.

sdu=size

is a synonym for max_sdu=size

max_sdu=size

The size of the largest packet that may be sent or received. If omitted, a context-dependent default value is used.

Values are specified as follows:

rate

The (decimal) rate, optionally followed by a unit. The unit may be prefixed with one of the multipliers k, M, or G, meaning 1'000, 1'000'000, or 1'000'000'000, respectively. The units cps (cells per second) and bps (bits per second) are recognized. If multiplier and unit are omitted, cells per second are assumed. Note that the rate is always converted to cells per second, so rounding errors may occur when specifying the rate in bits per second. Rates measured in bits per second are considered to be user data rates, i.e. one cell corresponds to 384 bits. The rate can be a fractional value, e.g. 1.3Mbps. It is an error to specify only a multiplier without a unit. Link speed can be indicated by using the keyword max as the rate.

size

The (decimal) number of bytes.

The tx: or rx: lists may also just contain the single element none, which indicates that the corresponding direction is not used. It is an error to specify none for both direction.

Note that commas must never follow colons or other commas. Also, whitespace is not allowed inside a QOS specification. QOS specifications are case-insensitive.

EXAMPLES

AUTHOR

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