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Relationship with OIF Mapping
Hardware Multicast Packet Replication Considerations
Copyright © 2010, Juniper Networks, Inc.
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.
When configuring hardware multicast packet replication, the following considerations
apply.
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.
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 information, see Configuring
Ethernet Interfaces in the JunosE Physical Layer Configuration Guide.
The regular multicast implementation utilizes interface stacking that provides a unique
IP attachment point for each elaboration of the egress multicast packet.
Chapter 1: Configuring IPv4 Multicast
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