Figure 17: Packet Flow Without Hardware Multicast Packet Replication
The hardware multicast packet replication feature enables you to configure multicast
traffic for a VLAN or S-VLAN to be replicated on the I/O module or IOA so that only one
copy of the packet is transmitted from the line module to the I/O module or IOA.
Replication for each of the ports is performed on the I/O module or IOA.
Configuring hardware multicast packet replication for high-density Ethernet is useful
when you want to provide the same multicast stream out of some or all of the ports,
such as for IP television (IPTV). Configuring hardware multicast packet replication enables
you to:
•
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.
You can use the feature to increase the bandwidth of multicast traffic out of each of the
Gigabit Ethernet ports.
Figure 18 on page 156 displays the flow of a multicast packet using the hardware multicast
packet feature.
155Copyright © 2010, Juniper Networks, Inc.
Chapter 5: Configuring IPv6 Multicast
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