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Configuration Guide - IP Multicast

CloudEngine 12800 and 12800E V200R005C10

This document describes the configurations of IP multicast, including IP multicast basics, IGMP, MLD, PIM (IPv4), PIM (IPv6), MSDP, multicast VPN, multicast route management (IPv4), multicast route management (IPv6), IGMP snooping, MLD snooping, static multicast MAC address, multicast VLAN, multicast network management.
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Introduction to Multicast VPN

Introduction to Multicast VPN

VPN Basic Concepts

BGP/MPLS IP VPN is a L3VPN technology and is called VPN for short in the following description. BGP/MPLS IP VPN uses the Border Gateway Protocol (BGP) to advertise VPN routes and uses Multiprotocol Label Switching (MPLS) to forward VPN packets on backbone networks (IP networks) of service providers (SPs). This technology is called IP VPN because IP packets are transmitted on VPNs.

Figure 7-1 Typical BGP/MPLS IP VPN networking

Figure 7-1 shows a typical BGP/MPLS IP VPN networking with PE, P, and customer edge (CE) devices. The SP network is the public network, while the VPN sites are private networks.

  • PE: is an edge device on the SP network. A PE is directly connected to CEs and completes all processing of VPN packets.
  • P: is a backbone device on the SP network. A P device is not directly connected to CEs. It provides only basic MPLS forwarding capabilities but does not maintain VPN information.
  • CE: is an edge device on a customer network. A CE provides interfaces that are directly connected to the SP network. A CE can be a router, switch, or host. Generally, CEs are unaware of VPNs and do not need to support MPLS.

For details about VPN features, see "BGP MPLS IP VPN Configuration" in Configuration Guide - VPN.

Multicast VPN Implementation

Multicast services are deployed on the VPNs shown in Figure 7-1. VPN users at a site receive multicast data from the VPN to which the site belongs.

For example, multicast VPN is implemented on VPNA. When multicast source S1 on VPNA sends multicast data to multicast group G, only G's members belonging to VPNA receive the multicast data from S1. Multicast data is transmitted in multicast mode both among sites and on the public network. VPN devices must support the following multicast capabilities to support multicast VPN implementation:

  • Devices at each site support multicast.

  • The P devices can implement multicast functions in the public network instance.

  • PEs can implement multicast functions in the public network instance and VPN instances.

    • PEs connect to sites through VPN instances and implement multicast functions in VPN instances.
    • PEs connect to the P devices through the public network instance and implement multicast functions in the public network instance.
    • PEs convert and transmit data between the public network instance and VPN instances.
Updated: 2019-04-20

Document ID: EDOC1100074724

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