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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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This section describes the concept of IPv4 multicast VPN and the network conditions that must be met for IPv4 multicast VPN implementation.

BGP/MPLS Virtual Private Network (VPN) is widely applied because it is easy to deploy and control. As network applications evolve and become more and more popular, VPN users now require IPTV services, multimedia on-demand services, and real-time video conference services.

If these services are directly transmitted on an MPLS/BGP VPN, the following problems arise:
  • Unicast transmission of IPTV, multimedia on demand, and real-time video conference services wastes too much bandwidth.

  • The device on the public network does not know the VPN routing and forwarding (VRF) table of each VPN instance and therefore is unable to forward the VPN multicast data.

Multicast VPN can solve the problems. It allows the multicast data of private networks to be transmitted to the destination over the public network.

As shown in Figure 7-1, three instances are configured on the network to bear multicast services, the VPN A instance, VPN B instance, and public network instance. They are independent from each other, and each instance corresponds to an isolated plane.

Figure 7-1  Multicast VPN based on multi-instance

The following takes VPN A as an example to describe how multicast VPN works:

  • The multicast source S1 belongs to VPN A. S1 sends multicast data to the multicast group G.

  • Among all possible data receivers, only members of VPN A (namely, site 1, site 2, and site 3) can receive multicast data from S1.

  • Multicast data is multicast on various sites and the public network.

Updated: 2019-06-12

Document ID: EDOC1000097181

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