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CLI-based Configuration Guide - IP Multicast

AR500, AR510, AR531, AR550, AR1500, and AR2500 V200R010

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.

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Multicast Concept

Multicast Concept

Multicast transmits data from one source to multiple receivers. Figure 1-3 shows the multicast transmission model. HostA and HostC are interested in information sent from Source and request the information. The data sent from Source is received only by HostA and HostC.

Figure 1-3  Multicast transmission

Entities in an IP multicast model are:

  • Multicast group: a group of receivers identified by a multicast IP address. User hosts (or other receiver devices) that have joined a multicast group become members of the group and can identify and receive the IP packets destined for the multicast group address.
  • Multicast source: a sender of multicast data. "Source" in Figure 1-3 is a multicast source. A multicast source can simultaneously send data to multiple multicast groups. Multiple multicast sources can send data to a multicast group simultaneously. Generally, a multicast source does not need to join a multicast group. The source designated router (DR) manages multicast source registration and setup of shortest path trees.
  • Multicast group member: a host that has joined a multicast group. HostA and HostC in Figure 1-3 are multicast group members. Memberships of a multicast group change dynamically. Hosts can join or leave a multicast group at any time. Members of a multicast group can be located anywhere on a network.
  • Multicast router: a router or Layer 3 switch that supports IP multicast. The routers in Figure 1-3 are multicast routers. They provide multicast routing functions, and those connected to user network segments also provide multicast member management functions.

Table 1-1 provides an analogy to explain the concept of IP multicast.

Table 1-1  Analogy between TV broadcasting and multicast transmission


TV Broadcasting

Multicast Transmission


A television station sends data to its channel.

A multicast source sends data to a multicast group.


Some audience members turn on their TV sets and select this channel.

Receivers join the multicast group.


TV sets play this channel.

Member hosts receive data sent to the multicast group.


Audience members switch to other channels or turn on/off their TV sets.

Member hosts dynamically join or leave multicast groups.

Updated: 2019-08-09

Document ID: EDOC1100034230

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