Cisco MWR 2941 Installation Manual Page 327

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Command Reference, Cisco IOS Release 15.1(3)MR
OL-26895-01
Chapter Cisco MWR 2941 Router Command Reference, Release 15.1(3)MR
priority
Usage Guidelines This command configures low latency queueing (LLQ), providing strict priority queueing (PQ) for
class-based weighted fair queueing (CBWFQ). Strict PQ allows delay-sensitive data such as voice to be
dequeued and sent before packets in other queues are dequeued.
The priority command allows you to set up classes based on a variety of criteria (not just User Datagram
Ports (UDP) ports) and assign priority to them, and is available for use on serial interfaces and ATM
permanent virtual circuits (PVCs). A similar command, the ip rtp priority command, allows you to
stipulate priority flows based only on UDP port numbers and is not available for ATM PVCs.
When the device is not congested, the priority class traffic is allowed to exceed its allocated bandwidth.
When the device is congested, the priority class traffic above the allocated bandwidth is discarded.
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, however.
Within a policy map, you can give one or more classes priority status. When multiple classes within a
single policy map are configured as priority classes, all traffic from these classes is queued to the same,
single, priority queue.
When the policy map containing class policy configurations is attached to the interface to stipulate the
service policy for that interface, available bandwidth is assessed. If a policy map cannot be attached to
a particular interface because of insufficient interface bandwidth, the policy is removed from all
interfaces to which it was successfully attached.
For more information on bandwidth allocation, see the chapter “Congestion Management Overview” in
the Cisco IOS Quality of Service Solutions Configuration Guide.
Examples The following example configures PQ with a guaranteed bandwidth of 50 kbps and a one-time allowable
burst size of 60 bytes for the policy map called policy1:
Router(config)# policy-map policy1
Router(config-pmap)# class voice
Router(config-pmap-c)# priority 50 60
In the following example, 10 percent of the available bandwidth is reserved for the class called voice on
interfaces to which the policy map called policy1 has been attached:
Router(config)# policy-map policy1
Router(config-pmap)# class voice
Router(config-pmap-c)# priority percent 10
12.2(28)SB This command was integrated into Cisco IOS Release 12.2(28)SB.
12.2(33)SRA This command was integrated into Cisco IOS Release 12.2(33)SRA.
12.2SX This command is supported in the Cisco IOS Release 12.2SX train.
Support in a specific 12.2SX release of this train depends on your
feature set, platform, and platform hardware.
Cisco IOS XE Release 2.1 This command was implemented on Cisco ASR 1000 series routers.
12.4(20)MR This command was integrated into Cisco IOS Release 12.4(20)MR.
12.2(33)MRA This command was integrated into Cisco IOS Release 12.2(33)MRA.
15.0(1)MR This command was integrated into Cisco IOS Release 15.0(1)MR.
Release Modification
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