12.1 PIM-IPv6 Overview
In the IPv6 network where multicast group members are densely distributed and each network
segment may have multicast group members, PIM-DM builds a unidirectional and loop-free
SPT from the multicast source to the group member through periodical flooding and pruning.
In IPv4 multicast applications, the Protocol Independent Multicast (PIM) is used to establish
multicast routes between switchs to replicate and forward multicast packets.
In IPv6 multicast applications, switchs run PIM-IPv6. The functions and principles of PIM-IPv6
are similar to those of PIM-IPv4.
PIM-IPv6 consists of the following separate protocols:
l PIM-DM: indicates the Protocol Independent Multicast-Dense Mode. PIM-DM is
applicable to a small-scale network with densely-distributed members. The network adopts
the Any-Source Multicast (ASM) model to implement multicast services.
l PIM-SM: indicates the Protocol Independent Multicast-Sparse Mode. PIM-SM is
applicable to a large-scale network with sparsely-distributed members. The network adopts
the ASM and Source-Specific Multicast (SSM) models to implement multicast services.
NOTE
l This chapter is concerned only about the PIM-DM configuration in the IPv6 network. PIM-DM in this
chapter refers to IPv6 PIM-DM, unless otherwise specified.
l For details of PIM-SM (IPv6), refer to the chapter PIM-SM (IPv6) Configuration.
l For details of ASM and SSM models, refer to the chapter "IP Multicast Overview" in the Quidway
S7700 Smart Routing Switch Feature Description - IP Multicast.
12.2 PIM-DM Features Supported by the S7700
The system can work normally with default PIM-DM parameters. You are also allowed to adjust
parameters related to neighbor discovery, prune, state refresh, graft, and assert according to
specific scenarios. In addition, you can configure various filtering policies and the PIM silent
function to enhance the IPv6 PIM-DM security.
Controlling the Forwarding of a Multicast Source
You can configure the Keepalive period of a multicast source and the filtering rules of the
multicast source.
Adjusting Control Parameters for Maintaining Neighbors
You can set the following control parameters by using the related commands:
l Interval for sending Hello messages
l Period for keeping neighbors reachable
l Whether the Hello messages without the Generation ID option are accepted
l Maximum delay for triggering Hello messages
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 12 PIM-DM (IPv6) Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
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