priority (QoS)
To assign a priority to a class of traffic belonging to a policy map, use the priority command in policy map
class configuration mode. To remove a previously specified priority for a class, use the no form of this
command.
priority [level priority-level]
no priority
Syntax Description
(Optional) Sets the class priority level value. Values are 1 or 2. Default level is
1. Level 1 traffic has higher priority.
The level keyword is not supported on ATM subinterfaces. The default is priority
level 1.
level priority-level
Command Default
If a priority action is not configured in a class, traffic in that class is not serviced with strict priority— it is
serviced after priority classes are serviced.
Command Modes
Policy map class configuration
Command History
ModificationRelease
This command was introduced.Release 2.0
The level keyword was added.Release 4.0.0
Usage Guidelines
To use this command, you must be in a user group associated with a task group that includes appropriate task
IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator
for assistance.
The priority command configures low-latency queueing (LLQ), providing strict priority queueing (PQ).
Strict PQ allows delay-sensitive data such as voice to be dequeued and sent before packets in other queues
are dequeued. When a class is marked as high priority using the priority command, we recommend that you
configure a policer to limit the priority traffic. This policer ensures that the priority traffic does not starve all
other traffic on the line card, which protects low-priority traffic from starvation. Use the police rate to
explicitly configure the policer.
The priority command sets up classes based on a variety of criteria (not just User Datagram Protocol [UDP]
ports) and assigns a priority to them.
The bandwidth and priority commands cannot be used in the same class, within the same policy map. These
commands can be used together in the same policy map .
Cisco IOS XR Modular Quality of Service Command Reference for the Cisco CRS Router, Release 4.0
OL-23235-03 69
Quality of Service Commands on the Cisco IOS XR Software
priority (QoS)
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