04-27-2016
We need to know more about your QOS box.
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QOS(7) Miscellaneous QOS(7)
NAME
qos - Quality of Service specification
DESCRIPTION
The text2qos and qos2text functions use the format described in this man page. Because all standard ATM tools on Linux use those functions
to convert to or from the textual representation of QOS specifications, they expect them in the same format too.
The most fundamental parameters are the traffic class and the AAL (ATM Adaption Layer) type. If the connection is bi-directional, both
directions have the same traffic class and the same AAL type. The traffic class and the AAL type are the first elements (in any order) in a
QOS specification. The traffic class is the only required element. If the AAL type is omitted, the application will provide a default
value. The following traffic classes are recognized:
ubr Unassigned Bit Rate
cbr Constant Bit Rate
abr Available Bit Rate
The following AAL types are recognized:
aal0 ("raw ATM")
aal5
If both, the traffic class and the AAL type are specified, they are separated by a comma.
If more parameters are supplied, the traffic class and AAL type must be followed by a colon. Traffic parameters can be specified indepen-
dently 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 param-
eter list (without prefix). The general format is as follows:
class_and_aal: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
Each of the following lines contains a valid QOS specification:
ubr
ubr:pcr=100kbps
cbr,aal0:pcr=64kbps
CBR:max_pcr=11Mbps,min_pcr=10mbps,sdu=8192
aal5,ubr:tx:none
cbr:tx:pcr=30000,rx:none
The following specificiations are equivalent:
CBR,AAL5:PCR=48Mbps
cbr,aal5:max_pcr=125000
cbr,aal5:tx:pcr=125kcps,rx:pcr=125kcps
AUTHOR
Werner Almesberger, EPFL LRC/ICA <werner.almesberger@epfl.ch>
Linux April 20, 2000 QOS(7)