Dell C9000 Series Networking Configuration Manual page 916

Creating an Input QoS Policy
To create an input QoS policy, use the following steps.
1 Create a Layer 3 input QoS policy.
CONFIGURATION mode
qos-policy-input
Create a Layer 2 input QoS policy by specifying the keyword layer2 after the qos-policy-input
command.
2 After you create an input QoS policy, do one or more of the following:
Configuring Policy-Based Rate Policing
Setting a DSCP Value for Egress Packets
Setting a dot1p Value for Egress Packets
Configuring Policy-Based Rate Policing
To configure policy-based rate policing, use the following command.
• Configure rate police ingress traffic.
QOS-POLICY-IN mode
rate-police
Setting a DSCP Value for Egress Packets
In an input QoS policy, you can set a DSCP value for egress packets based on ingress QoS classification.
The 6–bits that are used for DSCP are also used to identify the queue in which traffic is buffered. When you
set a DSCP value, Dell Networking OS displays an informational message advising you of the queue to which
you should apply the QoS policy (using the service-queue from POLICY-MAP-IN mode). If you apply the
QoS policy to a queue other than the one specified in the informational message, Dell Networking OS
replaces the first 3–bits in the DSCP field with the queue ID you specified.
Example of Setting a DSCP Value for Egress Packets
Dell#config
Dell(conf)#qos-policy-input my-input-qos-policy
Dell(conf-qos-policy-in)#set ip-dscp 34
% Info: To set the specified DSCP value 34 (100-010 b) the QoS policy must be
mapped to queue
4 (100 b).
Dell(conf-qos-policy-in)#show config
!
qos-policy-input my-input-qos-policy
set ip-dscp 34
Dell(conf-qos-policy-in)#end
Dell#
Setting a dot1p Value for Egress Packets
To set a dot1p value for egress packets, use the following command.
• Set a dot1p value for egress packets.
Quality of Service (QoS) 916