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Example: Assigning Forwarding Classes to Output Queues

This example shows how to assign forwarding classes to output queues.

Requirements

Before you begin, determine the MF classifier. See Example: Configuring and Applying a Firewall Filter for a Multifield Classifier.

Overview

In this example, you configure class of service and assign best-effort traffic to queue 0 as be-class, expedited forwarding traffic to queue 1 as ef-class, assured forwarding traffic to queue 2 as af-class, and network control traffic to queue 3 as nc-class.

You must assign the forwarding classes established by the MF classifier to output queues. Table 1 shows how this example assigns output queues.

Table 1: Sample Output Queue Assignments for mf-classifier Forwarding Queues

mf-classifier Forwarding Class	For Traffic Type	Output Queue
be-class	Best-effort traffic	Queue 0
ef-class	Expedited forwarding traffic	Queue 1
af-class	Assured forwarding traffic	Queue 2
nc-class	Network control traffic	Queue 3

Configuration

CLI Quick Configuration

To quickly configure this example, copy the following commands, paste them into a text file, remove any line breaks, change any details necessary to match your network configuration, and then copy and paste the commands into the CLI at the [edit] hierarchy level.

set class-of-service forwarding-classes queue 0 be-classset class-of-service forwarding-classes queue 1 ef-class set class-of-service forwarding-classes queue 2 af-class set class-of-service forwarding-classes queue 3 nc-class

Step-by-Step Procedure

The following example requires you to navigate various levels in the configuration hierarchy. For instructions on how to do that, see Using the CLI Editor in Configuration Mode in the Junos OS CLI User Guide .

To assign forwarding classes to output queues:

Configure class of service.
[edit]user@host# edit class-of-service forwarding-classes
Assign best-effort traffic to queue 0.
[edit class-of-service forwarding-classes]user@host# set queue 0 be-class
Assign expedited forwarding traffic to queue 1.
[edit class-of-service forwarding-classes]user@host# set queue 1 ef-class
Assign assured forwarding traffic to queue 2.
[edit class-of-service forwarding-classes]user@host# set queue 2 af-class
Assign network control traffic to queue 3.
[edit class-of-service forwarding-classes]user@host# set queue 3 nc-class

Results

From configuration mode, confirm your configuration by entering the show class-of-service command. If the output does not display the intended configuration, repeat the configuration instructions in this example to correct it.

[edit]user@host# show class-of-serviceforwarding-classes {queue 0 be-class;queue 1 ef-class;queue 2 af-class;queue 3 nc-class;}

If you are done configuring the device, enter commit from configuration mode.

Note: You cannot commit a configuration that assigns the same forwarding class to two different queues.

Verification

Confirm that the configuration is working properly.

Verifying Forwarding Classes Are Assigned to Output Queues

Verifying Forwarding Classes Are Assigned to Output Queues

Purpose

Verify that the forwarding classes are properly assigned to output queues.

Action

From configuration mode, enter the show class-of-service command.