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Command Reference Guide
Default Values
No default values are necessary for this command. The priority rate is assumed to be provided in Kbps
unless Mbps is specified. The burst size is assumed to be provided in bytes unless KB or MB is specified.
Command History
Release 6.1
Release 17.5
Release 18.1
Functional Notes
Priority queues are intended for constant bit rate (CBR) traffic, such as voice (due to the rate limiting).
Non-CBR traffic typically does not respond well to packet dropping when it is rate limited, so the transfer
rate can be much less efficient. Important data traffic should typically use the class-based queue
bandwidth command (refer to
The sum of the bandwidths reserved by priority and bandwidth commands for all entries of a QoS map
cannot exceed the available bandwidth on the interface (calculated by the total interface bandwidth minus
the max-reserved-bandwidth rate specified for the interfaces to which the QoS map is applied). Priority
bandwidth is guaranteed bandwidth (in kbps).
Weighted fair queuing (WFQ) must be enabled on an interface to use priority queuing. By
default, WFQ is enabled for all interfaces with maximum bandwidth speeds equivalent to
T1/E1 and below. It is also employed when shaping is enabled.
Determining Bandwidth Entries
When possible, use the priority <rate> command to specify an absolute amount of
bandwidth (in kbps) for the priority queue.
When determining the priority percent <value> entry, use the following formula:
where
Bandwidth
Line Rate
For example, to specify 76.8 kbps of data on an interface with a total of 512 kbps of available bandwidth,
enter the following command:
(config-qos-map 1)#priority percent 15
60000CRG0-35E
Command was introduced.
Command was expanded to allow specifying the rate in kbps and Mbps.
Specifying the burst size in bytes, MB, and kB was also added.
Command was expanded to include the strict-rate-limiting parameter.
bandwidth on page
3271) instead.
Bandwidth
Line Rate
Specifies the minimum amount of bandwidth needed for the traffic (in kbps).
Specifies the total data rate configured on the interface (for example,
8 DS0s (64 kbps per DS0) on a T1 equals a line rate of 512 kbps).
Copyright © 2012 ADTRAN, Inc.
Quality of Service Map Command Set
x 100
3286
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