Configuring Class-Based Priority Queuing - Cisco 3845 - Security Bundle Router Software Manual

Chapter 27 Configuring QoS
Switch(config-pmap)# exit
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# service-policy output out-policy-parent
Switch(config-if)# exit

Configuring Class-Based Priority Queuing

You can use the priority policy-map class configuration command to ensure that a particular class of
traffic is given preferential treatment. Strict priority queuing provides low-latency service to the class.
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Beginning in privileged EXEC mode, follow these steps to configure a strict priority queue:
Command
Step 1
configure terminal
Step 2
class-map class-map-name
Step 3 policy-map policy-map-name
Step 4
class class-map-name
Step 5 priority
Step 6 exit
Step 7 class class-map-name
Step 8
bandwidth remaining percent value
Step 9 end
Step 10 show policy-map
Step 11 copy running-config startup-config
After you have created an output policy map, you attach it to an egress port or EFP. See the
a Service Policy to an Interface or EFP" section on page
Use the no form of the appropriate command to delete an existing policy map or class map or to cancel
strict priority queuing for the priority class or the bandwidth setting for the other classes.
OL-23400-01
When priority is configured in an output policy map without the police command, you can only
configure the other queues for sharing by using the bandwidth remaining percent policy-map
command to allocate excess bandwidth.
You cannot configure priority and bandwidth for the same class.
You can apply priority at the class level and to the VLAN level.
You can associate the priority command with a single class at the class level and a single class at the
VLAN level.
Purpose
Enter global configuration mode.
Create classes for three egress queues. Enter match conditions
classification for each class.
Create a policy map by entering the policy map name, and enter
policy-map configuration mode.
Enter the name of the priority class (created by using the class-map
global configuration command), and enter policy-map class
configuration mode for the priority class.
Set the strict scheduling priority for this class.
Only one unique class map in an attached policy map can be
Note
associated with a priority command. You cannot configure
priority along with any other queuing action (bandwidth or
shape average).
Exit policy-map class configuration mode for the priority class.
Enter the name of a nonpriority class, and enter policy-map class
configuration mode for that class.
Set output bandwidth limits for the policy-map class as a percentage of
the remaining bandwidth. The range is 0 to 100 percent.
Return to privileged EXEC mode.
Verify your entries.
(Optional) Save your entries in the configuration file.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
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Configuring QoS
"Attaching
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