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JunosE 11.3.x Multicast Routing Configuration Guide
Configuring Multicast QoS Adjustment
Multicast OIF Mapping Case
154
When the router uses multicast OIF mapping, any multicast streams that a subscriber
receives bypass any configured QoS treatment for that subscriber interface. The Multicast
QoS adjust feature provides a way in which the router can account for this multicast
traffic.
NOTE: For additional information about how to configure OIF mapping, see
"Configuring Group Outgoing Interface Mapping" on page 53.
The following sections provide two possible configuration cases for using multicast QoS
adjustment.
NOTE: For additional information about QoS adjustment, see Parameter
Definition Attributes for QoS Administrators Overview .
Multicast OIF mapping enables the router to decrease the inefficiencies associated with
replicating streams of multicast traffic. Using OIF maps, MLD joins that the router receives
on a subscriber interface can be mapped to a special interface for forwarding. This special
interface can be on a different physical port or line module from that of the join interface.
Using this mapping function, the router can send a single copy of each multicast stream
over the special interface and the access nodes are configured to perform any final
replication to the subscribers and merge unicast and multicast data flows onto the
subscriber interfaces as necessary. See Figure 15 on page 155.
Copyright © 2010, Juniper Networks, Inc.
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