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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

In an AS, BGP A-D automatically discovers member PEs in a multicast VPN. A PIM-SSM MDT can be set up on the public network to transmit multicast services in a VPN.

Usage Scenario

In MD VPN, Provider Edges (PEs) in a VPN do not know information about peers or the multicast source. As a result, the PEs cannot send Join packets to the multicast source, and a Protocol Independent Multicast-Source-Specific Multicast (PIM-SSM) multicast distribution tree (MDT) cannot be set up.

To solve this problem, deploy BGP auto-discovery (A-D) multicast VPN in an autonomous system (AS) to allow PEs to automatically discover members in a VPN. A PIM-SSM MDT then can be set up, and multicast services in the VPN can be transmitted along the MDT in the public network.

At present, two A-D modes are supported. They are the multicast distribution tree-Subsequent Address Family Identifier (MDT-SAFI) A-D mode and the MCAST-VPN SAFI A-D mode.
  • MDT-SAFI A-D mode: defines a new address family in the MDT-SAFI message advertised using BGP. After being configured with multicast VPN, a PE advertises its multicast VPN configurations (including the RD and Share-Group address) in an MDT-SAFI message to all BGP peers. When a BGP peer receives the MDT-SAFI message, it compares the RD in the message with the local Route Distinguisher (RD). If the RDs are same, the BGP peer and the PE are members of the same VPN. The BGP peer then uses the MDT-SAFI message to set up a PIM-SSM MDT for transmitting VPN multicast services.

  • MCAST-VPN SAFI A-D mode: defines a new address family in the MCAST-VPN SAFI message advertised using BGP. Similar to MDT-SAFI A-D, MCAST-VPN SAFI A-D transmits messages between BGP peers to advertise multicast VPN configurations (including the RD and Share-Group address). Different from MDT-SAFI A-D, MCAST-VPN SAFI A-D is defined in a broader sense and supports more extensions. More multicast VPN attributes and information used for setting up the public network tunnel are carried in MCAST-VPN SAFI messages. For this reason, the MCAST-VPN SAFI A-D mode applies to next-generation multicast VPN.

BGP A-D multicast VPN is suitable for single-AS scenarios, with no Rendezvous Point (RP) configured on the public network.

The BGP A-D function does not affect the original multicast VPN service flow. If the Share-Group address is in the Any-Source Multicast (ASM) address range, or the Protocol Independent Multicast-Dense Mode (PIM-DM) protocol is used on the public network, tunnels can also be set up over the public network to transmit multicast traffic between sites of a VPN.

Pre-configuration Tasks

Before configuring BGP A-D multicast VPN, complete the following tasks:

  • Configuring a unicast routing protocol

  • Configuring BGP/MPLS IP VPN

  • Configuring multicast on the public network

Data Preparation

To configure BGP A-D multicast VPN, you need the following data.




IP address of the multicast source


RD and VPN target of the VPN instance


Share-Group address and Switch-Group address pool range of the VPN instance

Updated: 2019-06-12

Document ID: EDOC1000097181

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