R3303-HP HSR6800 Routers IP Multicast Configuration Guide

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• PE-PE neighboring relationship—PIM neighboring relationship established after a VPN instance on
a PE device receives a PIM hello from a VPN instance on a remote PE device through an MTI.
• PE-CE neighboring relationship—PIM neighboring relationship established between a
VPN-instance-associated interface on a PE device and an interface on a peer CE device.
Multicast across VPNs
MD VPN implements multicasting between the multicast source and the receivers when they are in the
same VPN. However, multicast data in different VPNs are isolated. If the multicast source and the
receivers are in different VPNs, you must configure multicast across VPNs so that the receivers can receive
multicast data from the multicast source.
Figure 63 Multicast across VPNs
As shown in Figure 63, Source 1 is in Site 1 of VPN A, Receiver 1 is in Site 2 of VPN A, Receiver 2 is
in Site 1 of VPN B. MD VPN enables Receiver 1 to receive multicast data from only Source 1, and
multicast across VPNs enables Receiver 2 to receive multicast data from Source 1.
The PE that directly connects to the multicast source is called the "source-side PE." The PEs that directly
connect to the sites of the receivers are called the "receiver-side PEs". In this figure, PE 1 is the source-side
PE, and PE 2 and PE 3 are the receiver-side PEs. To implement multicast across VPNs, source-side PE
configuration and receiver-side PE configuration schemes are available.
Source-side PE configuration
To implement multicast across VPNs, this configuration covers creating VPN instance that the receivers
belongs to on the source-side PE, and configuring a share-group for the VPN instance.