Example: QoS Parameter Configuration for Hierarchical Parameters

The example in this section illustrates how to configure hierarchical parameters for VLANs and S-VLANs.

Figure 62 shows the QoS scheduler hierarchy that the QoS client creates for the VLANs and S-VLANs in the interface stack. The QoS client creates explicit parameter instances using the parameter definition max-sub-bw to shape rates at the VLAN subinterfaces 100 and 101.

An S-VLAN node is located below the two VLAN nodes in the interface stack. The QoS client creates an implicit parameter instance by applying a shaper to the S-VLAN subinterface 10 that equals the total rate at the VLANs (3072000).

Figure 62: Hierarchical Parameters Scheduler Hierarchy

Procedure for QoS Administrators

This section describes the procedures to configure the scheduler hierarchy shown in Figure 62 by using QoS parameters.

Configuring the Parameter Definition

The QoS administrator configures the parameter definition for the maximum subscriber bandwidth.

To configure a parameter definition for the maximum subscriber bandwidth:

1. Configure the parameter definition named max-sub-bw.
2. Enable the parameter to control S-VLANs.
3. Enable the parameter to control VLANs.
4. Enable the parameter to have instances created on VLAN subinterfaces.
5. Specify that the QoS client can create the parameter instance for VLANs, which represent subscribers.

   host1(config)#qos-parameter-define max-sub-bw hierarchical

   host1(config-qos-parameter-define)#controlled-interface-type svlan

   host1(config-qos-parameter-define)#controlled-interface-type vlan

   host1(config-qos-parameter-define)#instance-interface-type vlan

   host1(config-qos-parameter-define)#subscriber-interface-type vlan

   host1(config-qos-parameter-define)#exit

Configuring the Scheduler Profiles

The QoS administrator can then reference the parameter definition within a scheduler profile, which defines the shaping rates for the parameter.

1. Configure a scheduler profile to shape the throughput the explicit QoS parameters for VLANs.
   1. Configure the scheduler profile named sp-shape-cvlan.
   2. Configure the shaping rate by referencing the parameter max-sub-bw.

      host1(config)#scheduler-profile sp-shape-cvlan

      host1(config-scheduler-profile)#shaping-rate max-sub-bw

      host1(config-scheduler-profile)#exit

2. Configure a scheduler profile to shape the S-VLAN throughput.
   1. Configure the scheduler profile named sp-shape-svlan.
   2. Configure the shaping rate by referencing the parameter max-sub-bw.

      host1(config)#scheduler-profile sp-shape-svlan

      host1(config-scheduler-profile)#shaping-rate max-sub-bw

      host1(config-scheduler-profile)#exit

Configuring the QoS Profiles

By referencing the scheduler profiles within QoS profiles, the QoS administrator creates the scheduler hierarchy. In this portion of the example, the QoS administrator configures QoS profiles for the VLAN and the S-VLAN.

1. Configure the QoS profile for the VLAN interfaces.
   1. Configure the QoS profile named qp-shape-cvlan.
   2. Configure the VLAN queue and reference the best-effort traffic class.
   3. Configure the VLAN node and reference the scheduler profile for shaping VLANs.

      host1(config)#qos-profile qp-shape-cvlan

      host1(config-qos-profile)#vlan queue traffic-class best-effort

      host1(config-qos-profile)#vlan node scheduler-profile sp-shape-cvlan

      host1(config-qos-profile)#exit

2. Configure the QoS profile for the S-VLAN interface.
   1. Configure the QoS profile named qp-shape-svlan.
   2. Configure the S-VLAN node and reference the scheduler profile sp-shape-svlan.

      host1(config)#qos-profile qp-shape-svlan

      host1(config-qos-profile)#svlan node scheduler-profile sp-shape-svlan

      host1(config-qos-profile)#exit

Procedure for QoS Clients

This section describes procedures to create parameter instances at VLAN subinterface 100 and VLAN subinterface 101.

1. Create an explicit parameter instance at VLAN subinterface 100.
   1. Specify the Gigabit Ethernet interface in slot 2, port 0.
   2. Configure the VLAN major interface.
   3. Configure the VLAN subinterface at slot 2, port 0, subinterface 100.
   4. Assign an S-VLAN ID of 10 and a VLAN ID of 100 to the VLAN subinterface.
   5. Attach the max-sub-bw QoS parameter to the subinterface with a value of 1024000.
   6. Attach the qp-shape-cvlan QoS profile to the subinterface.

      host1(config)#interface gigabitEthernet 2/0

      host1(config-if)#encapsulation vlan

      host1(config)#interface gigabitEthernet 2/0.100

      host1(config-if)#svlan id 10 100

      host1(config-if)#qos-parameter max-sub-bw 1024000

      host1(config-if)#qos-profile qp-shape-cvlan

      host1(config-if)#exit

2. Create an explicit parameter instance at VLAN subinterface 101.
   1. Specify the VLAN subinterface 101 in slot 2, port 0.
   2. Assign an S-VLAN ID of 10 and a VLAN ID of 101 to the VLAN subinterface.
   3. Attach the max-sub-bw QoS parameter to the subinterface with a value of 2048000.
   4. Attach the qp-shape-cvlan QoS profile to the subinterface.

      host1(config-if)#interface gigabitEthernet 2/0.101

      host1(config-if)#svlan id 10 101

      host1(config-if)#qos-parameter max-sub-bw 2048000

      host1(config-if)#qos-profile qp-shape-cvlan

      host1(config-if)#exit

3. Create an implicit parameter instance at S-VLAN subinterface 10.
   1. Specify the Gigabit Ethernet interface at slot 2, port 0.
   2. Attach the qp-shape-svlan QoS profile to the node at S-VLAN subinterface 10.

      host1(config)#interface gigabitEthernet 2/0

      host1(config-if)#svlan 10 qos-profile qp-shape-svlan

Monitoring Hierarchical QoS Parameters

After completing the configuration, both the QoS administrator and the QoS client can monitor it by issuing the show qos-parameter references command. To display the information about hierarchical parameter instances, you must specify the Gigabit Ethernet interface.

host1#show qos-parameter max-sub-bw references interface gigabitEthernet 2/0

                            parameter            instance
         interface             name     value      Type
--------------------------- ---------- ------- ------------
GigabitEthernet2/0 svlan 10 max-sub-bw 3072000 hierarchical
GigabitEthernet2/0.100      max-sub-bw 1024000 explicit
GigabitEthernet2/0.101      max-sub-bw 2048000 explicit

  Explicit parameter instances:      2
  Hierarchical parameter instances:  1
  IP multicast parameter instances:  0
  Parameter instances reported:      3

Complete Configuration Example

You can use the complete configuration examples provided for each of the configurations in your own network. To customize the configuration example for your needs, copy the text into a text editor, and modify it.

To use the example for immediate use, copy it to the local console or Telnet session from which you access the router.

You can also save the example as a script (.scr) file that executes the commands as though they were entered at the terminal. For information about executing .scr files, see JUNOSe System Basics Configuration Guide.

QoS Administrator Configuration

From Global Configuration mode:

QoS Client Configuration

From Global Configuration mode:

Related Topics

•  Hierarchical QoS Parameters Overview

Copyright © 2008, Juniper Networks, Inc. All rights reserved. Trademark Notice.