3Com Switch 8800 Advanced Software V5 Configuration Guide

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IPV6 PIM CONFIGURATION
When configuring IPv6 PIM, go to these sections for information you are
interested in:
■ “IPv6 PIM Overview” on page 671
■ “Configuring IPv6 PIM-DM” on page 681
■ “Configuring IPv6 PIM-SM” on page 684
■ “Displaying and Maintaining IPv6 PIM” on page 696
■ “IPv6 PIM Configuration Examples” on page 697
■ “Troubleshooting IPv6 PIM Configuration” on page 705
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■ The term "router" in this document refers to a router in a generic sense or a
Switch 8800 running IPv6 PIM.
■ Currently, for Switch 8800s , only modules with the suffix DA, DB, or DC
support IPv6 multicast. That is, a module that provides incoming ports for IPv6
multicast data should be such a module suffixed with DA, DB or DC, namely a
IPv6-capable module. A module that provides outgoing interfaces can be any
type of module.
■ In the case that IPv6 multicast data can be delivered to the switch only through
ports on a non-IPv6-capable module, you can configure IPv6 multicast
centralized mode to enable normal forwarding of IPv6 multicast data. See
“Configuring IPv6 Multicast and IPv6 Unicast Centralized Mode Example” on
page 710 .
■ Currently, a POS interface on a Switch 8800 does not support IPv6 multicast,
namely those commands used in interface view cannot be executed in POS
interface view.
IPv6 PIM Overview Protocol Independent Multicast for IPv6 (IPv6 PIM) provides IPv6 multicast
forwarding by leveraging static routes or IPv6 unicast routing tables generated by
any IPv6 unicast routing protocol, such as RIPng, OSPFv3, IS-ISv6, or BGP4+. IPv6
PIM uses an IPv6 unicast routing table to perform reverse path forwarding (RPF)
check to implement IPv6 multicast forwarding. Independent of the IPv6 unicast
routing protocols running on the device, IPv6 multicast routing can be
implemented as long as the corresponding IPv6 multicast routing entries are
created through IPv6 unicast routes. IPv6 PIM uses the reverse path forwarding
(RPF) mechanism to implement IPv6 multicast forwarding. When an IPv6 multicast
packet arrives on an interface of the device, it is subject to an RPF check. If the RPF
check succeeds, the device creates the corresponding routing entry and forwards
the packet; if the RPF check fails, the device discards the packet. For more
information about RPF, refer to
“Implementation of the RPF mechanism” on page
516.