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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 multicast VPN extranet, familiarize yourself with the deployment scenario, complete the pre-configuration tasks, and obtain the data required for the configuration.

Usage Scenario

Multicast VPN implemented in either multicast domain (MD) or BGP auto-discovery (A-D) mode supports multicast data transmission within a VPN only. VPN sites that belong to different VPNs cannot access each other in either of the two modes.

In real world situations, the following needs, however, may arise:
  • Enterprises in different VPNs need to communicate with each other.

  • A service provider in a VPN needs to provide multicast services for users that reside in other VPNs.

In the two situations, the multicast source and multicast data receivers reside in different VPNs. Multicast services need to be transmitted between different VPNs, or the multicast data from a VPN user needs to reach other VPN users. Multicast VPN extranet can be deployed to meet these needs. Note that multicast VPN extranet applies to PIM SM/Source-Specific Multicast (SSM) networks only.

As shown in Figure 7-22, after multicast VPN extranet is configured, the receiver connected to PE3 in VPN BLUE (a VPN instance named BLUE) can receive multicast data both from VPN BLUE and VPN GREEN. This is an example of multicast data transmission between VPNs.

Figure 7-22  Application scenario of multicast VPN extranet

Before configuring multicast VPN extranet, note the following points when you deploy multicast services on the network:
  • The rendezvous point (RP) set for the source VPN and receiver VPN must be a static RP, and the static RP must reside adjacent to the multicast source to serve the multicast groups adopting the multicast VPN extranet service. RPs that serve other multicast groups in this VPN can be either dynamic or static. The anycast RP function will not be affected.

  • The address range of the multicast groups adopting the multicast VPN extranet service cannot overlap the multicast group address range internally used by the local VPN; the address range of new multicast groups adopting the multicast VPN extranet service cannot overlap the address range that has been configured for other multicast groups adopting the multicast VPN extranet service.

  • The SSM group address range must be set consistently for both the source VPN and the receiver VPN for providing the multicast VPN extranet service.

Pre-configuration Tasks

Before configuring multicast VPN extranet, complete the following tasks:

  • Configuring a unicast routing protocol

  • Configuring BGP/MPLS IP VPN

  • Configuring multicast on the public network

  • Configuring basic multicast VPN functions

Data Preparation

To configure multicast VPN extranet, you need the following data.




IP address of the multicast source


Address of the multicast group adopting the multicast VPN extranet service


RD and VPN target of each VPN instance


Address pool ranges for the Share-Group and Switch-Group in each VPN instance

Updated: 2019-06-12

Document ID: EDOC1000097181

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