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CLI-based Configuration Guide - IP Multicast

AR120, AR150, AR160, AR200, AR1200, AR2200, AR3200, and AR3600 V200R007

This document describes the principles and configurations of IP multicast, and provides configuration examples.
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Before You Start

Before You Start

Before configuring basic MD VPN functions, familiarize yourself with the usage scenario, complete the pre-configuration tasks, and obtain the data required for the configuration. This will help you complete the configuration task quickly and accurately.

Usage Scenario

MD VPN only supports IP multicast in Any-Source Multicast (ASM) mode on the public network. Protocol independent multicast (PIM) tunnels are set up on the public network to transmit multicast data between sites in a VPN.

You need to ensure that a VPN operates properly if you want to have multicast data transmitted in the VPN. To allow a Provider Edge (PE) to receive data from multiple VPNs, configure a public network instance and multiple VPN instances on the PE. The public network instance is responsible for the communication with the Provider (P), and the VPN instances are responsible for the communication with respective Customer Edges (CEs).

A Share-MDT (MDT is short for multicast distribution tree) is used to guide multicast forwarding in MD VPN. Alternatively, a special Switch-MDT can be constructed to guide forwarding of VPN multicast data flowing to the public network. The VPN multicast data is then switched from the Share-MDT to the Switch-MDT. Multicast data can therefore be transmitted on demand, and the stress on PEs is reduced.

Pre-configuration Tasks

Before configuring MD VPN, complete the following tasks:

  • Configuring a unicast routing protocol

  • Configuring BGP/MPLS IP VPN

  • Configuring multicast functions on the public network

Data Preparation

To configure MD VPN, you need the following data.




Names of VPN instances and Route Distinguishers (RDs)


Share-Group address


Address and Maximum Transmission Unit (MTU) of the Multicast Tunnel Interface (MTI)

Updated: 2019-06-12

Document ID: EDOC1000097181

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