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CLI-based Configuration Guide - IP Multicast

AR500, AR510, and AR530 V200R007

This document describes the principles and configurations of IP multicast, and provides configuration examples.
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Single-AS MD VPN

Single-AS MD VPN

The single-AS MD VPN is mainly used to isolate multicast services in different VPNs within a multicast domain (MD).

Figure 7-17  Single-AS MD VPN

As shown in Figure 7-17, a single AS runs MPLS/BGP VPN. Both PE1 and PE2 are configured with two VPN instances, namely, VPN BLUE and VPN RED, and the same Share-Group address is set for the same VPN instances on the two PEs. In such a case, the VPN instances with the same Share-Group address join the same MD. After the corresponding Share-multicast distribution tree (MDT) is established, the protocol packets and low-rate data in the VPNs can be transmitted through their respective Multicast Tunnel (MT).

VPN BLUE is taken as an example to describe how multicast services are transmitted between VPNs.

  1. A VPN instance named VPN BLUE is configured on both PE1 and PE2 and the instances on the two PEs use the same Share-Group address. After the corresponding Share-MDT is established, the VPN BLUE instances connected with CE1B and CE2B can exchange multicast protocol packets through the corresponding MT.

  2. Multicast devices in the VPNs connected with CE1B and CE2B can then establish neighbor relationships, and send Join, Prune, and BootStrap router (BSR) messages to each other. The protocol packets in the VPNs are encapsulated and decapsulated only on the MT of the PEs. The devices, however, do not know that they are in VPN networks. They still process the multicast protocol packets and forward multicast data packets like the devices in the public network. In this way, multicast service transmission in one VPN instance is implemented and multicast services in different VPN instances are isolated.

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Updated: 2019-06-12

Document ID: EDOC1000097280

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