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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 71 Multicast across VPNs
As shown in
, 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.
Figure 72 Source-side PE configuration