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, RPF check is performed on it. 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, see IPv6 Multicast Routing and Forwarding

Configuration in the IP Multicast Volume.
Based on the implementation mechanism, IPv6 PIM falls into two modes:

•

Protocol Independent Multicast–Dense Mode for IPv6 (IPv6 PIM-DM), and

•

Protocol Independent Multicast–Sparse Mode for IPv6 (IPv6 PIM-SM).

NOTE:

To facilitate description, a network comprising IPv6 PIM–supporting routers is referred to as an “IPv6 PIM
domain” in this document.

Introduction to IPv6 PIM-DM

IPv6 PIM-DM is a type of dense mode IPv6 multicast protocol. It uses the “push mode” for IPv6 multicast

forwarding, and is suitable for small-sized networks with densely distributed IPv6 multicast members.
The basic implementation of IPv6 PIM-DM is as follows:

This manual is related to the following products:

H3C SecPath F5000-A5 Firewall H3C SecBlade FW Cards H3C SecPath U200-A U200-M U200-S