单选题What is the use of MSDP across multiple PIM domains？（）AIt scopes multicast traffic.BIt prevents multicast routing loops.CIt advertises active multicast sources.DIt advertises RPs to all downstream routers.
单选题
What is the use of MSDP across multiple PIM domains？（）
A
It scopes multicast traffic.
B
It prevents multicast routing loops.
C
It advertises active multicast sources.
D
It advertises RPs to all downstream routers.
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