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多选题
Which two statements are true about RPF checks in MSDP（Multicast Source Discovery Protocol）？（）
A
It prevents message looping，Session Advertisement（SA）messages must be RPF checked
B
RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SM domain，which originated the SA
C
RPF checking Session Advertisement（SA）messages will cause message looping
D
RPF check should be done against the route to the source S of the corresponding PIM-SM domain
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