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Table Of Contents
Configuring QoS Marking Policies
Prerequisites for QoS Marking Policies
Creating an IP Precedence Policy
Creating a Class of Service Policy
Creating a Discard Class Policy
Creating Ingress and Egress Policies
Verifying the QoS Policy Configuration
Configuration Example for QoS Marking Policies
Feature History for QoS Marking Policies
Configuring QoS Marking Policies
This chapter describes how to configure QoS marking policies on Cisco Nexus 1000V to prioritize network traffic.ou
This chapter includes the following sections:
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Information About Policy Maps
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Information About Policy Maps
Policy maps prioritize network traffic by class. You create policy maps to define how to treat each class of traffic so that it is prioritized for the best quality of service.
Marking is the process of marking packets, that is, changing one of the following in the packet for QoS purposes:
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You can map a traffic class to a DSCP, which is an indicator of the service level for a specified frame. The DSCP value ranges from 0 to 63, and the default is 0. A DSCP value of 46 is disallowed.
Service policies are specified using policy maps. Policy maps provide an ordered mapping of class maps to service levels. You can specify multiple class maps within a policy map, and map a class map to a high, medium, or low service level. The default priority is low. The policy map name is restricted to 63 alphanumeric characters.
The order of the class maps within a policy map is important to determine the order in which the frame is compared to class maps. The first matching class map has the corresponding priority marked in the frame.
Figure 3-1 Packet Fields Available for Marking
Marking is the setting of QoS information that is related to a packet. You can set the value of standard QoS fields IP precedence, DSCP and Class of Service (CoS), and internal labels that can be used in subsequent actions such as policing.
Once your traffic classes are defined, you can reference them in the policy map where you also define how they should be marked. We recommend that you keep the policy simple by using no more than four classes.
The fields available for marking are listed in Table 3-1.
For a single class, you can set operations on any two out of the following five fields: CoS, IP Precedence, DSCP, QoS Group, and Discard Class.
Unless noted as a restriction, you can mark both incoming and outgoing packets.
Prerequisites for QoS Marking Policies
Marking has the following prerequisites:
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Guidelines and Limitations
QoS policies have the following guidelines and limitations:
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Creating QoS Marking Policies
This section describes how to create QoS policies for the Cisco Nexus 1000V:
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Creating a DSCP Policy
You can create a policy that marks the DSCP value in the IP header packet to prioritize traffic in a particular class.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
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SUMMARY STEPS
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DETAILED STEPS
Step 1
config t
Example:
n1000v# config t
n1000v(config)#
Places you into global configuration mode.
Step 2
policy-map [type qos] [match-first] policy-map-name
Example:
n1000v(config)# policy-map policy1
n1000v(config-pmap-qos)#
Places you into policy map QoS configuration mode for the specified policy map and configures the map name in the running configuration.
The class_map_name argument is an alphabetic string that can be up to 40 case-sensitive characters long, including hyphen (-) and underscore (_) characters.
Step 3
class [type qos] {class_map_name | class-default}
Example:
n1000v(config-pmap)# class class1
Creates a reference to class-map-name and enters policy-map class QoS configuration mode for the specified class map. By default, the class is added to the end of the policy map. Changes are saved in the running configuration.
Use the class-default keyword to select all traffic that is not currently matched by classes in the policy map.
Step 4
set dscp value
Example:
n1000v(config-pmap-c-qos)# set dscp af31
Defines the DSCP value that should be used in all IP headers for the specified class and saves it in the running configuration.
You can use a numeric value from 1 to 60 or one of the standard values from the "DSCP and Precedence Values" section on page A-1.
In this example, the standard value of af31 is used.
Step 5
show policy-map policy_map_name
Example: n1000v(config-pmap-c-qos)# show policy-map policy1Displays the policy map configuration for the specified map name.
Step 6
copy running-config startup-config
Example:
n1000v(config-pmap-c-qos)# copy running-config startup-config(Optional) Saves the running configuration persistently through reboots and restarts by copying it to the startup configuration.
Creating an IP Precedence Policy
You can mark IP Precedence to give priority to all packets in a particular traffic class.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
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SUMMARY STEPS
1.
2.
3.
4.
5.
6.
DETAILED STEPS
Step 1
config t
Example:
n1000v# config t
n1000v(config)#
Places you into global configuration mode.
Step 2
policy-map [type qos] [match-first] policy-map-name
Example:
n1000v(config)# policy-map policy1
n1000v(config-pmap-qos)#
Places you into policy map QoS configuration mode for the specified policy map and configures the map name in the running configuration.
The class_map_name argument is an alphabetic string that can be up to 40 case-sensitive characters long, including hyphen (-) and underscore (_) characters.
Step 3
class [type qos] {class_map_name | class-default}
Example:
n1000v(config-pmap-qos)# class class1
Creates a reference to class-map-name and enters policy-map class QoS configuration mode for the specified class map. By default, the class is added to the end of the policy map. Changes are saved in the running configuration.
Use the class-default keyword to select all traffic that is not currently matched by classes in the policy map.
Step 4
set precedence value
Example:
n1000v(config-pmap-c-qos)# set precedence 3
Adds the precedence value that should be used in all packets for the specified traffic class. The change is saved in the running configuration.
You can use a numeric value from 0 to 7, as show in Table 3-2.
Step 5
show policy-map policy_map_name
Example: n1000v(config-pmap-c-qos)# show policy-map policy1Displays the policy map configuration for the specified map name.
Step 6
copy running-config startup-config
Example:
n1000v(config-pmap-c-qos)# copy running-config startup-config(Optional) Saves the running configuration persistently through reboots and restarts by copying it to the startup configuration.
Creating a Class of Service Policy
You can mark the CoS field in the IEEE 802.1Q header for all traffic in a specific class. If you mark this field in an ingress or egress policy, it will only be set when a packet egresses an IEEE 802.1Q-capable interface.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
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SUMMARY STEPS
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6.
DETAILED STEPS
Creating a QoS Group Policy
You can mark the locally defined QoS group value.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
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SUMMARY STEPS
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6.
DETAILED STEPS
Creating a Discard Class Policy
You can set a local internal label discard class policy.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
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For more information, see the "Configuring Discard Class Classification" procedure on page 2-8.
SUMMARY STEPS
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DETAILED STEPS
Creating Ingress and Egress Policies
You can attach a policy map to an interface or a port profile so that the marking instructions are applied to the ingress or egress packets.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
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Note
SUMMARY STEPS
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DETAILED STEPS
EXAMPLES
This example shows how to configure an ingress policy on an Ethernet interface:
n1000v# config t
n1000v(config)# interface ethernet 1/1
n1000v(config-if)# service-policy input policy1
n1000v(config-if)# show policy-map policy1Type qos policy-maps====================policy-map type qos policy1n1000v(config-if)# copy running-config startup-configThis example shows how to configure an ingress policy on a port profile:
n1000v# config t
n1000v(config)# port-profile accessprofile
n1000v(config-port-prof)# service-policy input policy1
n1000v(config-port-prof)# show policy-map policy1Type qos policy-maps====================policy-map type qos policy1n1000v(config-port-prof)# copy running-config startup-configMarking the Port DSCP
You can mark the DSCP port for each class of traffic that is defined in a specified ingress or egress policy map.
BEFORE YOU BEGIN
Before beginning this procedure, you must know or do the following:
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Note
SUMMARY STEPS
1.
2.
3.
4.
5.
6.
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DETAILED STEPS
Step 1
config t
Example:
n1000v# config t
n1000v(config)#
Places you into global configuration mode.
Step 2
policy-map [type qos] [match-first] policy-map-name
Example:
n1000v(config)# policy-map policy1
n1000v(config-pmap-qos)#
Places you into policy map QoS configuration mode for the specified policy map and configures the map name in the running configuration.
The class_map_name argument is an alphabetic string that can be up to 40 case-sensitive characters long, including hyphen (-) and underscore (_) characters.
Step 3 a
class [type qos] {class_map_name | class-default}
Example:
n1000v(config-pmap)# class class1
n1000v(config-pmap-c-qos)#
Creates a reference to class-map-name and enters policy-map class QoS configuration mode for the specified class map. By default, the class is added to the end of the policy map. Changes are saved in the running configuration.
Use the class-default keyword to select all traffic that is not currently matched by classes in the policy map.
Step 4 b
set dscp value
Example:
n1000v(config-pmap-c-qos)# set dscp af31
Sets a DSCP value. Valid values are shown in the "DSCP and Precedence Values" section on page A-1.
Step 5
Repeat Step 3 and Step 4 for each class map that you want to create.
Step 6
exit
Example:
n1000v(config-pmap-c-qos)# exit
n1000v(config-pmap-qos)#
Returns you to policy map configuration mode.
Step 7
exit
Example:
n1000v(config-pmap-qos)# exit
n1000v(config)#
Returns you to global configuration mode.
Step 8
Enter one of the following commands:
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Example:
n1000v(config)# interface ethernet 1/1
n1000v(config-if)#
Places you into the configuration mode for the specified Ethernet or vEthernet interface or port profile.
Step 9
service-policy [type qos] {input | output} policy-map-name [no-stats]
Example:
n1000v(config-if)# service-policy input policy1
(Optional) Attaches a policy map name that will be added to the input or output packets of the interface or port profile.
Note
Step 10
show policy-map policy_map_name
Example: n1000v(config-if)# show policy-map policy1Displays the policy map configuration for the specified map name.
Step 11
copy running-config startup-config
Example:
n1000v(config-if)# copy running-config startup-config(Optional) Saves the running configuration persistently through reboots and restarts by copying it to the startup configuration.
EXAMPLES
This example shows how to mark the DSCP port for each class of traffic defined in an ingress policy map on an Ethernet interface.
n1000v# config tn1000v(config)# policy-map policy1n1000v(config-pmap)# class class1n1000v(config-pmap-c-qos)# set dscp af31n1000v(config-pmap-c-qos)# exitn1000v(config-pmap-qos)# class class2n1000v(config-pmap-c-qos)# set dscp af13n1000v(config-pmap-c-qos)# exitn1000v(config-pmap-qos)# class class-defaultn1000v(config-pmap-c-qos)# set dscp af22n1000v(config-pmap-c-qos)# exitn1000v(config-pmap-qos)# exitn1000v(config)# interface ethernet 1/1n1000v(config-if)# service-policy input policy1n1000v(config-if)# show policy-map policy1Type qos policy-maps====================policy-map type qos policy1class class1set dscp af31class class2set dscp af13class class-defaultset dscp af22n1000v(config-if)# copy running-config startup-configThis example shows how to mark the DSCP port for each class of traffic defined in an ingress policy map on a port profile.
n1000v# config tn1000v(config)# policy-map policy1n1000v(config-pmap-qos)# class class1n1000v(config-pmap-c-qos)# set dscp af31n1000v(config-pmap-c-qos)# exitn1000v(config-pmap-qos)# class class2n1000v(config-pmap-c-qos)# set dscp af13n1000v(config-pmap-c-qos)# exitn1000v(config-pmap-qos)# class class-defaultn1000v(config-pmap-c-qos)# set dscp af22n1000v(config-pmap-c-qos)# exitn1000v(config-pmap-qos)# exitn1000v(config)# port-profile accessprofilen1000v(config-port-prof)# service-policy input policy1n1000v(config-port-prof)# show policy-map policy1Type qos policy-maps====================policy-map type qos policy1class class1set dscp af31class class2set dscp af13class class-defaultset dscp af22n1000v(config-port-prof)# copy running-config startup-configVerifying the QoS Policy Configuration
To verify the QoS policy configuration, perform one of the following tasks:
show policy-map [type qos] [name policy_map_name]
Displays the policy map configuration.
show table-map name
Displays the table map configuration.
Configuration Example for QoS Marking Policies
This example shows how to display a specific policy-map policy:
n1000v(config)# show policy-map policy-ipaclType qos policy-maps====================policy-map type qos policy-ipaclclass class-ipaclset dscp 10This example shows how to display policy maps for all interfaces:
n1000v# show policy-map interface briefInterface/VLAN [Status]:INP QOS OUT QOS INP QUE OUT QUE================================================================================Vethernet1 [Active]: mediaVethernet10 [Active]: mediaVethernet13 [Active]:web_policerVethernet15 [Active]:iperfVethernet16 [Active]: iperf_policerVethernet17 [Active]:ixia_in ixia_outVethernet18 [Active]: mediaVethernet19 [Active]:iperfVethernet20 [Active]: iperf_policerVethernet21 [Active]:netperf_polic================================================================================Feature History for QoS Marking Policies
This section provides the QoS marking policies release history.
