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# Configuring a Parameter Definition for QoS Downstream Rate

To associate a parameter instance with the QoS downstream rate application:

1. Configure traffic classes.
   `
   host1(config)#traffic-class voice
   host1(config-traffic-class)#exit
   host1(config)#traffic-class best-effort
   host1(config-traffic-class)#exit
   `
2. Create a parameter definition for the QoS downstream rate application.
   1. Configure the QoS parameter name and the application.
      `
      host1(config)#qos-parameter-define downstreamVLAN application qos-downstream-rate
      `
   2. Configure controlled-interface types.
      `
      host1(config-qos-parameter-define)#controlled-interface-type vlan
      host1(config-qos-parameter-define)#controlled-interface-type ip
      `
   3. Configure subscriber-interface types.
      `
      host1(config-qos-parameter-define)#subscriber-interface-type vlan
      `
3. Do one of the following:
   - For VLANs, configure the shaping mode by creating a parameter definition with the QoS cell mode application. Ensure that you specify a subscriber-interface type.

     See Configuring a Parameter Definition to Shape Ethernet Traffic Using Cell Mode.

   - For ATM VCs, configure the shaping mode by issuing the qos-shaping-mode command.

     See Configuring the QoS Shaping Mode for ATM Interfaces.

4. Enable QoS adaptive mode for the system by issuing the qos-adaptive-mode command in L2C Configuration mode.
   `
   host1(config)#l2c
   host1(config-l2c)#qos-adaptive-mode
   `
5. Enable the QoS downstream rate application to use downstream rates obtained from the Actual-Data-Rate-Downstream [26-130] DSL Forum VSA.
   `
   host1(config)#aaa qos downstream-rate
   `
6. Configure the scheduler profile for the shaping rate.
   `
   host1(config)#scheduler-profile vlan1
   host1(config-scheduler-profile)#shared-shaping-rate downstreamVLAN * 5 auto
   `
7. Configure the QoS profile for the shaping rate.
   `
   host1(config)#qos-profile vlan1
   host1(config-qos-profile)#vlan node scheduler-profile vlan1
   `
8. Attach the QoS profile to a logical Ethernet interface.

   ANCP or AAA dynamically creates the parameter instances for the QoS downstream rate application, and if applicable, the QoS cell mode application; therefore, you do not need to specify them.

   `
   host1(config)#interface gigabitEthernet 6/0/2
   host1(config-if)#encapsulation vlan
   host1(config-if)#interface gigabitEthernet 6/0/2.1
   host1(config-if)#vlan id 1
   host1(config-if)#qos-profile vlan1
   host1(config-if)#ip address 6.10.10.10 255.255.255.255
   `

#### Related Topics

- Example: QoS Parameter Configuration for QoS Downstream Rate
- For information about downstream rate and RADIUS, see JUNOSe Broadband Access Configuration Guide
- For more information about configuring ANCP (L2C) parameters, see JUNOSe IP Services Configuration Guide
- aaa qos downstream-rate command
- controlled-interface-type command
- encapsulation vlan command
- instance-interface-type command
- ip address command
- node command
- qos-parameter command
- qos-adaptive-mode command
- qos-parameter-define command
- qos-profile command
- queue command
- shared-shaping-rate command
- subscriber-interface-type command
- traffic-class command
- vlan id command

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