Accton Technology ES4524D, ES4548D, 24/48-Port manual Quality of Service Commands Function Mode

Chapter 56: Quality of Service Commands

The commands described in this section are used to configure Differentiated Services (DiffServ) classification criteria and service policies. You can classify traffic based on access lists, IP Precedence or DSCP values, or VLANs. Using access lists allows you select traffic based on Layer 2, Layer 3, or Layer 4 information contained in each packet.

Table 56-1 Quality of Service Commands

Command	Function	Mode	Page
class-map	Creates a class map for a type of traffic	GC	56-2
match	Defines the criteria used to classify traffic	CM	56-3
policy-map	Creates a policy map for multiple interfaces	GC	56-4
class	Defines a traffic classification for the policy to act on	PM	56-4
set	Classifies IP traffic by setting a CoS, DSCP, or IP-precedence	PM-C	56-5
	value in a packet
police	Defines an enforcer for classified traffic	PM-C	56-6
service-policy	Applies a policy map defined by the policy-mapcommand to	IC	56-7
	the input of a particular interface
show class-map	Displays the QoS class maps which define matching criteria	PE	56-8
	used for classifying traffic
show policy-map	Displays the QoS policy maps which define classification	PE	56-8
	criteria for incoming traffic, and may include policers for
	bandwidth limitations
show policy-map interface	Displays the configuration of all classes configured for all	PE	56-9
	service policies on the specified interface

To create a service policy for a specific category of ingress traffic, follow these steps:

1.Use the class-mapcommand to designate a class name for a specific category of traffic, and enter the Class Map configuration mode.

2.Use the match command to select a specify type of traffic based on an access list, a DSCP or IP Precedence value, or a VLAN.

3.Set an ACL mask to enable filtering for the criteria specified in the match command.

4.Use the policy-mapcommand to designate a policy name for a specific manner in which ingress traffic will be handled, and enter the Policy Map configuration mode.

5.Use the class command to identify the class map, and enter Policy Map Class configuration mode. A policy map can contain multiple class statements.

6.Use the set command to modify the QoS value for matching traffic class, and use the policer command to monitor the average flow and burst rate, and drop any traffic that exceeds the specified rate, or just reduce the DSCP service level for traffic exceeding the specified rate.

7.Use the service-policycommand to assign a policy map to a specific interface.

56-1