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JunosE 11.3.x Multicast Routing Configuration Guide
Relationship with OIF Mapping
Hardware Multicast Packet Replication Considerations
160
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 188 in "Configuring Multicast Listener Discovery" on page 179.
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 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 information, see Configuring
Ethernet Interfaces in JunosE Physical Layer Configuration Guide.
The regular multicast implementation utilizes interface stacking that provides a unique
IPv6 attachment point for each elaboration of the egress multicast packet.
Copyright © 2010, Juniper Networks, Inc.
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