HP MSR ASM Configuration Manual page 25

Implements information exchange and data conversion between the public network and VPN
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instances.
As shown in Figure 10, when a multicast source in VPN A sends a multicast stream to a multicast group,
only the receivers that belong to both the multicast group and VPN A can receive the multicast stream.
The multicast data is multicast both in VPN A and on the public network.
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