Create A Qos Policy - Dell Force10 Z9000 Configuration Manual

Create a QoS Policy

There are two types of QoS policies: input and output.
Input QoS policies regulate Layer 3 and Layer 2 ingress traffic. The regulation mechanisms for input QoS
policies are rate policing and setting priority values. There are two types of input QoS policies: Layer 3 and
Layer 2.
• Layer 3 QoS input policies allow you to rate police and set a DSCP or dot1p value.
• Layer 2 QoS input policies allow you to rate police and set a dot1p value.
Output QoS policies regulate Layer 3 egress traffic. The regulation mechanisms for output QoS policies
are rate limiting, rate shaping, and WRED.
Note: When changing a "service-queue" configuration in a QoS policy map, all QoS rules are deleted and
re-added automatically to ensure that the order of the rules is maintained. As a result, the Matched
Packets value shown in the "show qos statistics" command is reset.
Create an input QoS policy
To create an input QoS policy:
1. Create a Layer 3 input QoS policy using the command
mode. Create a Layer 2 input QoS policy by specifying the keyword
qos-policy-input
2. Once you create an input QoS policy, do one or more of the following:
• Configure policy-based rate policing
• SSet a DSCP value for egress packets
• Set a dot1p value for egress packets
Configure policy-based rate policing
Rate police ingress traffic using the command rate-police from QOS-POLICY-IN mode.
Set a DSCP value for egress packets
Set a DSCP value for egress packets
Set a DSCP value for egress packets based on ingress QoS classification, as shown in
bits that are used for DSCP are also used to identify the queue in which traffic is buffered. When you set a
DSCP value, FTOS displays an informational message advising you of the queue to which you should
apply the QoS policy (using the command
QoS policy to a queue other than the one specified in the informational message, FTOS replaces the first 3
bits in the DSCP field with the queue ID you specified.
| Quality of Service (QoS)
732
.
is supported only on platform
service-queue
from CONFIGURATION
qos-policy-input
layer2 after the command
e
from POLICY-MAP-IN mode). If you apply the
Figure 35-2. The 6