Relationship With Oif Mapping; Hardware Multicast Packet Replication Considerations - Juniper JUNOSE 11.0.X MULTICAST ROUTING Configuration Manual

Relationship with OIF Mapping

Multicast OIF mapping enables the router to decrease the inefficiencies associated
with replicating streams of multicast traffic. Using OIF maps, IGMP joins that the
router receives on a subscriber interface can be mapped to a dedicated multicast
VLAN.
The hardware multicast packet replication feature enables you to redirect each of
the IP interfaces on a line module over a dedicated multicast VLAN to a single IP
interface over port 8. The FC is only required to send a single packet per dedicated
multicast VLAN to the I/O module or IOA. The module then replicates this packet to
the appropriate ports.
For more information about configuring OIF mapping, see "Configuring Group
Outgoing Interface Mapping" on page 53 in "Configuring IGMP" on page 43.

Hardware Multicast Packet Replication Considerations

When configuring hardware multicast packet replication, the following considerations
apply.
Egress IP policy
Egress VLAN policy
QoS
Do not configure or transmit routing protocols over port 8. The FC drops traffic
routed to an IP interface stacked over port 8.
We recommend that you configure the IP address of the IP interface over port
8 to be unnumbered.
We recommend that you configure an IP interface over a VLAN over one of the
physical ports to reference the IP interface over the same VLAN over port 8.
You cannot create the following configurations:
When two IP interfaces configured over a port reference the same IP interface
over port 8. The system does not accept this configuration attempt because
you typically configure the hardware multicast packet replication feature to
redirect multicast traffic over one VLAN, then redirect it to the same VLAN
on port 8.
When the IP interface configured with the hardware multicast packet
replication attribute is not installed on a line module that supports hardware
multicast packet replication.
When the IP interface designated by the hardware multicast packet replication
attribute is not installed on a line module that supports hardware multicast
packet replication.
When the IP interface designated by the hardware multicast packet replication
attribute is not on the same line module as the IP interface configured with
this attribute.
Chapter 1: Configuring IPv4 Multicast
Configuring Hardware Multicast Packet Replication
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