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# Configuring a Parameter Definition for IP Multicast Bandwidth Adjustment

Before you configure a parameter definition for IP multicast bandwidth:

- Define a multicast bandwidth map and the QoS adjustment for a virtual router.

  See JUNOSe Multicast Routing Configuration Guide.

To associate a parameter instance with the IP multicast bandwidth adjustment 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.
   1. Configure the QoS parameter name and the application.
      `
      host1(config)#qos-parameter-define ipm application ip-multicast hierarchical
      `
   2. Configure a controlled-interface type.
      `
      host1(config-qos-parameter-define)#controlled-interface-type vlan
      host1(config-qos-parameter-define)#exit
      `
3. Create a parameter instance that globally defines the value of the IP multicast adjustment as 0.
   `
   host1(config)#qos-parameter ipm 0
   `
4. Reference the parameter within a scheduler profile parameter expression.
   `
   host1(config)#scheduler-profile vlan-subscriber
   host1(config-scheduler-profile)#shared-shaping-rate 1000000 - ipm burst 50 milliseconds auto
   host1(config-scheduler-profile)#exit
   `
5. Add the scheduler profile to a QoS profile.
   `
   host1(config)#qos-profile vlan-subscriber
   host1(config-qos-profile)#vlan queue traffic-class best-effort
   host1(config-qos-profile)#vlan queue traffic-class voice scheduler-profile 192k
   host1(config-qos-profile)#vlan node scheduler-profile vlan-subscriber
   host1(config-qos-profile)#exit
   `
6. Attach the parameter definition to a logical interface.
   `
   host1(config)#interface gigabitEthernet 7/0
   host1(config-if)#encapsulation vlan
   host1(config-if)#exit
   host1(config)#interface gigabitEthernet 7/0.1
   host1(config-if)#vlan id 200
   host1(config-if)#qos-profile vlan-subscriber
   host1(config-if)#ip address 1.1.1.1 255.255.255.0
   `

After the QoS profile is attached to the interface, the IP multicast bandwidth adjustment application begins to adjust rates based on IGMP joins and leaves received on that interface.

#### Related Topics

- IP Multicast Bandwidth Adjustment for QoS Overview
- Example: QoS Parameter Configuration for IP Multicast Bandwidth Adjustment
- controlled-interface-type
- encapsulation vlan
- interface gigabitEthernet
- node
- qos-parameter-define
- qos-profile
- queue
- scheduler-profile
- shared-shaping-rate
- traffic-class
- vlan id

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