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Example: Configuring Strict-Priority Queuing

 

This example shows how to configure strict-priority queuing and prevent starvation of other queues.

Requirements

Before you begin, review how to create and configure forwarding classes. See Forwarding Classes Overview.

Overview

In this example, you create a BA classifier to classify traffic based on the IP precedence of the packet. The classifier defines IP precedence value 101 as voice traffic and 000 as data traffic. You assign forwarding-class priority queue 0 to voice traffic and queue 1 as data traffic. You then configure the scheduler map as corp-map and voice scheduler as voice-sched.

Then you set the priority for the voice traffic scheduler as strict-high and for the data traffic scheduler as strict-low. You apply the BA classifier to input interface ge-0/0/0 and apply the scheduler map to output interface e1-1/0/0. You then configure two policers called voice-drop and voice-excess. You set the burst size limit and bandwidth limit for voice-drop policer and for voice-excess policer. You then create a firewall filter that includes the new policers and add the policer to the term.

Finally, you apply the filter to output interface e1-1/0/1 and set the IP address as 203.0.113.1/24.

Configuration

Configuring a BA Classifier

CLI Quick Configuration

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

Step-by-Step Procedure

To configure a BA classifier:

  1. Create a BA classifier and set the IP precedence value for voice traffic.
  2. Create a BA classifier and set the IP precedence value for data traffic.

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.

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

Configuring Forwarding Classes

CLI Quick Configuration

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

Step-by-Step Procedure

To configure forwarding classes:

  1. Assign priority queuing to voice traffic.
  2. Assign priority queuing to data traffic.

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.

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

Configuring a Scheduler Map

CLI Quick Configuration

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

Step-by-Step Procedure

To configure a scheduler map:

  1. Configure a scheduler map and voice scheduler.
  2. Configure a scheduler map and data scheduler.

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.

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

Configuring a Scheduler

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, copy and paste the commands into the CLI at the [edit] hierarchy level, and then enter commit from configuration mode.

Step-by-Step Procedure

To configure schedulers:

  1. Configure a voice traffic scheduler and set the priority.
  2. Configure a data traffic scheduler and set the priority.

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.

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

Applying a BA Classifier to an Input Interface

CLI Quick Configuration

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

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 CLI User Guide.

To apply a BA classifier to an input interface:

  1. Configure an interface.
  2. Apply a BA classifier to an input interface.

Results

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

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

Applying a Scheduler Map to an Output Interface

CLI Quick Configuration

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

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 CLI User Guide.

To apply the scheduler map to an output interface:

  1. Configure an interface.
  2. Apply a scheduler map to an output interface.

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.

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

Configuring Two Policers

CLI Quick Configuration

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

Step-by-Step Procedure

To configure two policers:

  1. Configure a policer voice drop.
  2. Configure a policer voice excess.
  3. Create a firewall filter that includes the new policers.
  4. Add the policer to the term.

Results

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

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

Applying a Filter to an Output Interface

CLI Quick Configuration

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

Step-by-Step Procedure

To apply a filter to an output interface:

  1. Apply a filter to an interface.
  2. Set an IP address.

Results

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

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

Verification

Confirm that the configuration is working properly.

Verifying the Scheduler Map

Purpose

Verify that the scheduler map is configured properly.

Action

From operational mode, enter the show class-of-service scheduler-map corp-map command.

Verifying the Interfaces

Purpose

Verify that the interfaces are configured properly.

Action

From configuration mode, enter the show interfaces command.

Verifying the Interface Queues

Purpose

Verify that the interface queues are configured properly.

Action

From configuration mode, enter the show interfaces queue command.