Quality of Service Commands
4-371
4
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.
To create a service policy for a specific category of ingress traffic, follow these steps:
1.
Use the
class-map
command 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.
Use the
policy-map
command to designate a policy name for a specific
manner in which ingress traffic will be handled, and enter the Policy Map
configuration mode.
4.
Use the
class
command to identify the class map, and enter Policy Map Class
configuration mode. A policy map can contain multiple class statements.
5.
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
Table 4-92 Quality of Service Commands
Command
Function
Mode Page
class-map
Creates a class map for a type of traffic
GC
4-372
match
Defines the criteria used to classify traffic
CM
4-373
rename
Redefines the name of a class map
CM
4-374
description
Specifies the description of a class map
CM
4-374
policy-map
Creates a policy map for multiple interfaces
GC
4-375
class
Defines a traffic classification for the policy to act on
PM
4-375
rename
Redefines the name of a policy map
PM
4-374
description
Specifies the description of a policy map
PM
4-374
set
Classifies IP traffic by setting a CoS, DSCP, or IP-precedence
value in a packet
PM-C
4-376
police
Defines an enforcer for classified traffic
PM-C
4-377
service-policy
Applies a policy map defined by the
policy-map
command to
the input of a particular interface
IC
4-378
show class-map
Displays the QoS class maps which define matching criteria
used for classifying traffic
PE
4-378
show policy-map
Displays the QoS policy maps which define classification
criteria for incoming traffic, and may include policers for
bandwidth limitations
PE
4-379
show policy-map interface Displays the configuration of all classes configured for all
service policies on the specified interface
PE
4-379
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