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

JUNOSe 11.0.x Multicast Routing Configuration Guide

Relationship with OIF Mapping

Multicast OIF mapping enables the router to decrease the inefficiencies associated
with replicating streams of multicast traffic. Using OIF maps, MLD joins that the
router receives on a subscriber interface can be mapped to a special interface for
forwarding.
The hardware multicast packet replication feature enables you to redirect each of
the IPv6 interfaces on a line module over a dedicated multicast VLAN to a single IPv6
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 192 in "Configuring Multicast Listener Discovery"
on page 183.

Hardware Multicast Packet Replication Considerations

When configuring hardware multicast packet replication, the following considerations
apply.
164
Configuring Hardware Multicast Packet Replication
Do not configure or transmit routing protocols over port 8. The FC drops traffic
routed to an IPv6 interface stacked over port 8.
We recommend that you configure the IP address of the IPv6 interface over port
8 to be unnumbered.
We recommend that you configure an IPv6 interface over a VLAN over one of
the physical ports to reference the IPv6 interface over the same VLAN over
port 8.
You cannot create the following configurations:
When two IPv6 interfaces configured over a port reference the same IPv6
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 IPv6 interface configured with the hardware multicast packet
replication attribute is not installed on a line module that supports hardware
multicast packet replication.
When the IPv6 interface designated by the hardware multicast packet
replication attribute is not installed on a line module that supports hardware
multicast packet replication.
When the IPv6 interface designated by the hardware multicast packet
replication attribute is not on the same line module as the IPv6 interface
configured with this attribute.
When you configure a unique source MAC address for VLANs on port 8, the
hardware multicast packet replication hardware stamps the source MAC address
on the VLAN, overwriting any MAC address that you configured. For more