Huawei Quidway S9300

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3.1 Introduction to PIM-DM

This section describes the basic information about PIM-DM.

NOTE

The switch referred in the following contents is an S9300 supporting the Layer 3 multicast protocol and

multicast routing function.

The Protocol Independent Multicast (PIM) indicates that a static route or any unicast routing

protocol such as RIP, OSPF, IS-IS, or BGP can provide routing information for IP multicast.

Although the multicast routing entry is generated through the unicast routing table, the multicast

routing is independent of unicast routing protocols.

PIM forwards multicast packets through the Reverse Path Forwarding (RPF) mechanism. The

RPF mechanism uses the existing unicast routing information to create a multicast forwarding

tree. When a multicast packet reaches an S9300, the S9300 performs the RPF check. If the

multicast packet passes the RPF check, the S9300 creates the matching multicast routing entry

to forward the multicast packet. If the multicast packet fails to pass the RPF check, the S9300

discards the packet.

The Protocol Independent Multicast Dense Mode (PIM-DM) belongs to the multicast routing

protocol in dense mode, which is applicable to the densely-distributed network in a small scale.

Figure 3-1 shows the function and position of PIM-DM in a multicast network.

Figure 3-1 Application of PIM-DM in a multicast network

UserD

Source

Multicast

Receiver

UserB

Receiver

UserC

Receiver

UserA

IGMP

PIM-DM

IGMP

S9300

3.2 PIM-DM Features Supported by the S9300

This section describes PIM-DM features supported by the S9300.

Quidway S9300 Terabit Routing Switch

Configuration Guide - Multicast 3 PIM-DM Configuration

Issue 01 (2009-07-28) Huawei Proprietary and Confidential

3-3

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