Figure 18: Packet Flow with Optimized Multicast Packet Replication
Each high-density Ethernet module has eight physical ports, numbered 0–7. A logical
port is available for the hardware multicast packet replication feature, numbered port
8.
JunosE tracks the OIFs in an mroute that have been redirected to use the hardware
multicast packet replication hardware. The system accepts only egress multicast traffic
to traverse the interface stack on the enabled port. The system drops unicast traffic that
is routed to this port.
Each port on the I/O module or IOA displayed in Figure 18 on page 156 has two queues.
These queues are further down the egress path than the queues found on the line module
and populated by the FC.
The low-priority queue is dedicated to packets that are received from the line module
queues that are dedicated to the physical ports. This queue blocks when full and provides
backpressure to the line module. This queue services unicast and multicast traffic that
is not using the hardware multicast packet replication feature.
Copyright © 2010, Juniper Networks, Inc.156
JunosE 11.2.x Multicast Routing Configuration Guide
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