A.It prevents message looping， Session Advertisement （SA）messages must be RPF checked
B.RPF check should be done against the route to the source S of the corresponding PIM-SM domain
C.RPF check should be done against the route to the Rendez-vous Point of the corresponding PIM-SM domain，which originated the SA
D.RPF checking Session Advertisement （SA） messages will cause message looping

A.The VPNv6 address is a 96-bit route distinguisher and a 128-brt IPv6 address
B.The VPNv6 address is a 64-bit route distinguisher and a 128-bit IPv6 address
C.The VPNv6 address is a 64-brt route distinguisher and a 96-brt IPv6 address
D.The VPMv6 address is a 96-brt route distinguisher and a 96-bit IPv6 address
E.The VPNv6 address is a 128-bit route distinguisher and a 128-brt IPv6 address