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JunosE 11.3.x Multicast Routing Configuration Guide
Figure 4: Packet Flow Without Hardware Multicast Packet Replication
18
The bandwidth between the line module and the I/O module or IOA on the E Series router
is limited. A high-density Ethernet module provides eight physical ports that can consume
the bandwidth between the line module and the I/O module or IOA before providing
enough traffic to support egress line rate for all of these ports.
Figure 4 on page 18 displays how multicast traffic is typically replicated on the line module.
Each of these replicated packets is transmitted from the line module to the I/O module
or IOA.
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:
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