more appropriately, when an OIF is added to the mroute), the router reduces the unicast
QoS bandwidth applied to the subscriber interface (that is, the join interface) by the
amount of bandwidth for that multicast stream.
Multicast Traffic Receipt Without Forwarding
In this case, the router is not given the responsibility of forwarding multicast streams.
Instead, the service provider arranges for the router to receive the multicast streams so
the router can detect the flow and perform QoS adjustment. An OIF map is installed that
maps the traffic streams to a loopback interface configured for MLD version passive.
This means that when the traffic is received, a null mroute is installed (that is, an mroute
with an empty OIF list) and the router applies the QoS adjustment to the join interface.
See Figure 16 on page 153.
NOTE: Ensure that PIM-SM (or any other upstream multicast protocol) is informed of
the group (or source-group) interest.
Figure 16: Multicast Traffic Receipt Without Forwarding
Activating Multicast QoS Adjustment Functions
The ipv6 multicast-routing bandwidth-map command activates the specified bandwidth
map. By activating the bandwidth map, this command also activates the multicast QoS
adjustment function contained in the bandwidth map.
CAUTION: To activate multicast QoS adjustment, you must first create a bandwidth
map. See “Defining a Multicast Bandwidth Map” on page 148 for details.
153Copyright © 2010, Juniper Networks, Inc.
Chapter 5: Configuring IPv6 Multicast
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