Huawei quidway s7700 - 5 PIM-DM (Ipv4) Configuration

5 PIM-DM (IPv4) Configuration
About This Chapter
This chapter describes the PIM-DM (IPv4) fundamentals, configuration steps, and maintenance
for PIM-DM functions, along with typical examples.
5.1 PIM-DM Overview
In the 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.
5.2 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 PIM-DM security.
5.3 Configuring Basic PIM-DM Functions
Ensure that unicast routes are reachable before enabling IPv4 multicast routing, and enable PIM-
DM on each interface of the multicast device. In this manner, the PIM-DM network can work
normally.
5.4 Adjusting Control Parameters of a Multicast Source
A multicast device can control the forwarding of multicast data based on multicast sources. This
helps to control multicast data flows and limit information that can be obtained by downstream
receivers to enhance security.
5.5 Adjusting Control Parameters for Maintaining Neighbor Relationships
PIM devices exchange Hello messages to set up neighbor relationships and negotiate various
control parameters for controlling the neighbor relationships.
5.6 Adjusting Control Parameters for Prune
When the last member leaves a group, the multicast device sends a Prune message upstream,
requesting the upstream device to execute the prune action. If other downstream devices on the
same network segment need the multicast data for this group, they need to send Join messages
to override the prune action.
5.7 Adjusting Control Parameters for State-Refresh
In a PIM-DM network, the periodic flooding-pruning wastes lots of network resources. To
prevent the pruned interface from forwarding messages because the prune timer times out, you
Quidway S7700 Smart Routing Switch
Configuration Guide - Multicast 5 PIM-DM (IPv4) Configuration
Issue 01 (2011-07-15) Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
104