Figure 18: Packet Flow With Optimized Multicast Packet Replication - Juniper JUNOSE 11.1.X MULTICAST ROUTING Configuration Manual

JUNOSe 11.1.x Multicast Routing Configuration Guide
You can use the feature to increase the bandwidth of multicast traffic out of each of
the Gigabit Ethernet ports.
Figure 18 on page 162 displays the flow of a multicast packet using the hardware
multicast packet feature.

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.
162
Configuring Hardware Multicast Packet Replication
Reduce the number of packets sent from the FC to the module.
Reduce the CPU consumed by the FC processing each elaboration of the packet.