3Com Switch 8800 Advanced Software V5 Configuration Guide

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IPV6 MULTICAST ROUTING AND
FORWARDING CONFIGURATION
When configuring IPv6 multicast routing and forwarding, go to the following
sections for information you are interested in:
■ “IPv6 Multicast Routing and Forwarding Overview” on page 515
■ “Configuring IPv6 Multicast Routing and Forwarding” on page 518
■ “Displaying and Maintaining IPv6 Multicast Routing and Forwarding” on page
520
■ “Troubleshooting IPv6 Multicast Policy Configuration” on page 521
n
■ The term "router" in this document refers to a router in a generic sense or a
Switch 8800 running an IPv6 multicast routing protocol.
■ Currently, POS interfaces of Switch 8800s do not support IPv6 multicast. The
commands to be executed in interface view are not executable in POS interface
view.
IPv6 Multicast Routing
and Forwarding
Overview
Introduction to IPv6
Multicast Routing and
Forwarding
In IPv6 multicast implementations, multicast routing and forwarding are
implemented by three types of tables:
■ Each IPv6 multicast routing protocol has its own multicast routing table, such
as IPv6 PIM routing table.
■ The multicast routing information of different IPv6 multicast routing protocols
forms a general IPv6 multicast routing table.
■ The IPv6 multicast forwarding table is directly used to control the forwarding of
IPv6 multicast packets. This is the table that guides IPv6 multicast forwarding.
The IPv6 multicast forwarding table is consistent with the IPv6 routing table.
An IPv6 multicast forwarding table consists of a set of (S, G) entries, each
indicating the routing information for delivering multicast data from a multicast
source to a multicast group. If a router supports multiple IPv6 multicast protocols,
its IPv6 multicast routing table will include routes generated by these protocols.
The router chooses the optimal route from the IPv6 multicast routing table based
on the configured multicast routing and forwarding policy and installs the route
entry into its IPv6 multicast forwarding table.
RPF Mechanism When creating IPv6 multicast routing table entries, an IPv6 multicast routing
protocol uses the reverse path forwarding (RPF) to ensure IPv6 multicast data
delivery along the correct path.