Juniper JUNOSE SOFTWARE FOR E SERIES 11.3.X - QUALITY OF SERVICE CONFIGURATION GUIDE 2010-09-22 Configuration Manual page 284

JunosE 11.3.x Quality of Service Configuration Guide
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logical interface minus the ip-multicast bandwidth. To enable the IP multicast QoS
adjustment, you must:
Define a qos-parameter using the qos-parameter-define command with the application
ip-multicast and the hierarchical keyword.
host1(config)# qos-parameter-define ipm application ip-multicast hierarchical
host1(config-qos-parameter-define)#
Reference the ipm parameter within a scheduler profile. For example:
host1(config)#scheduler-profile totalSubscriberBw
host1(config-scheduler-profile)#shared-shaping-rate 10000000 - ipm auto
This scheduler profile contains an expression for the shared-shaping rate that limits
the shared-shaping rate to 10 Mbps less the rate of any IP multicast traffic.
Reference the scheduler profile within a QoS profile rule. For example:
host1(config)#qos-profile subscriber
host1(config-qos-profile)#vlan node scheduler-profile totalSubscriberBw
This QoS profile rule limits a subscriber with vlan to the rate specified in the
totalSubscriberBw scheduler profile.
QoS clients do not need to create a parameter instance to activate the IP multicast
bandwidth adjustment application. The system automatically creates explicit instances
based on IGMP joins and leaves.
When a subscriber logs in, the QoS scheduler hierarchy is created with the vlan configured
for shared shaping, based on the expression 1000000 - ipm. If no multicast traffic is
being transmitted, there is no ipm parameter instance with the vlan.
To calculate the subscriber bandwidth from the total subscriber bandwidth, you must
create a global parameter instance using the ip-multicast keyword and set the value to
0.
To ensure the system can locate an instance of the ipm parameter for subscribers that
are not receiving multicast traffic, you must create a global parameter with a value of 0:
host1(config)# qos-parameter ipm 0
If you do not create the global parameter instance, the expression result is undefined for
these subscribers and the shared shaping rate is not set.
By configuring a global parameter instance of 0, the value is applied to all the interfaces
that reference the parameter. QoS overrides the global ipm parameter instance with the
value specified in the bandwidth map for a specific IP interface on which IGMP joins.
Guidelines for Configuring IP Multicast Adjustment for QoS on page 255
For more information about multicast bandwidth maps and QoS adjustment, see
JunosE Multicast Routing Configuration Guide
For more information about configuring scheduler rates for QoS parameters, see
Scheduler Profiles and Parameter Expressions for QoS Administrators on page 221
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