Enabling Llq - Cisco Catalyst 3750 Software Configuration Manual

Chapter 26 Configuring QoS
Switch(config)# policy-map parent
Switch(config-pmap)# class vlan101
Switch(config-pmap-c)# bandwidth percent 30
Switch(config-pmap-c)# service-policy policy1
Switch(config-pmap-c)# exit
Switch(config-pmap)# exit
Switch(config)# interface gigabitethernet1/1/1
Switch(config-if)# service-policy output parent

Enabling LLQ

LLQ provides strict-priority queueing for a traffic class. It enables delay-sensitive data, such as voice,
to be sent before packets in other queues are sent. The priority queue is serviced first until it is empty.
Only one traffic stream can be destined for the priority queue per class-level policy. The priority queue
restricts all traffic streams in the same hierarchy, and you should use care when configuring this feature.
You enable the priority queue for a traffic class by using the priority policy-map class configuration
command in an egress policy-map attached to an ES port.
Before beginning this procedure, make sure that you have reviewed the configuration guidelines and
have created the class map to isolate traffic. For more information, see the
Configuration Guidelines" section on page 26-76
Maps" section on page
Beginning in privileged EXEC mode, follow these steps to enable class-level priority queueing in a
service policy for outbound traffic. This procedure is optional. The examples that follow the procedure
show how to enable class-level and VLAN-level priority queueing.
Command
Step 1
configure terminal
Step 2 policy-map policy-map-name
Step 3 class class-name
Step 4
priority
Step 5 exit
Step 6 exit
Step 7
interface interface-id
Step 8
service-policy output policy-map-name
Step 9 end
78-15870-01
26-78.
Purpose
Enter global configuration mode.
Create a policy map by entering the policy-map name, and enter
policy-map configuration mode.
By default, no policy maps are defined.
Specify the name of the class whose traffic policy you want to create
or change, and enter policy-map class configuration mode.
By default, no traffic classes are defined.
Enable the strict priority queue, and give priority to a class of traffic.
By default, strict priority queueing is disabled.
Return to policy-map configuration mode.
Return to global configuration mode.
Specify an ES port to attach to the policy map, and enter interface
configuration mode.
Specify the egress policy-map name, and apply it to the ES port.
Only one policy map per port is supported.
Return to privileged EXEC mode.
Catalyst 3750 Metro Switch Software Configuration Guide
"Hierarchical QoS
and the "Classifying Egress Traffic by Using Class
Configuring Hierarchical QoS
26-97