Cisco Systems 78-13983-04

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Cisco MWR 1900 Mobile Wireless Edge Router Software Configuration Guide

78-13983-04

Chapter4 Configuring with the Command-Line I nterface

Configuring QoS Attributes

Step 3 Describe the QoS actions you want the router to perform when the router encounters a packet that has

the characteristics described by the class map. Use one or more of the following commands:

Router(config-pmap-c)# priority percent number

Router(config-pmap-c)# bandwidth percent number

Router(config-pmap-c)# queue-limit number

Router(config-pmap-c)# priority rate-in-kbps

Router(config-pmap-c)# shape {average | peak} cir [bc] [be]

Router(config-pmap-c)# shape max-buffers number-of-buffers

•priority percent gives priority to a class of traffic belonging to a policy map and specifies that a

certain percentage of the available bandwidth should be reserved for this class.

•bandwidth percent specifies the bandwidth allocated for a class belonging to a policy map.

•queue-limit specifies the maximum number of packets the queue can hold for a class policy

configured in a policy map.

•priority enables low-latency priority queuing, which allows you to assign a specified share of the

link bandwidth to one queue that receives priority over all others. Low-latency priority queueing

minimizes the packet-delay variance for delay-sensit ive traffic, such as live voice and video.

•shape and shape max-buffers are used with class-based weighted fair queuing (CB-WFQ), which

allows you to control the traffic going out an interface in order to match its transmission to the speed

of the remote target interface.

Note The bandwidth percent and priority percent 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.

For more information about these commands, see the “Cisco IOS Quality of Service Solutions Command

Reference.”

Step 4 To configure the Class-Based Packet Marking feature, you must configure either an IP Precedence value

or an IP differentiated services code point (DSCP). The QOS group is optional.

Router(config-pmap-c)# set ip dscp ip-dscp-value

Router(config-pmap-c)# set ip precedence ip-precedence-value

Router(config-pmap-c)# set qos-group qos-group-value

•set ip dscp marks a packet by setting the IP DSCP value.

•set ip precedence marks a packet by setting the IP Precedence bits in the ToS byte.

•set qos-group associates a local QoS group value with a packet.

For more information about these commands, see the “Cisco IOS Quality of Service Solutions Command

Reference.”