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Multicast Between PIM-SM Domains Within an AS Using MSDP
When the multicast source and the receiver are located in different PIM-SM domains of the same AS, you can configure MSDP peers on the RPs to implement inter-domain multicast.
As shown in Figure 6-6, the MSDP peer relationship is set up between RPs of two PIM-SM domains. In this manner, information about the multicast source is shared between the two domains.