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多选题
Which two statements about MPLS point-to-multipoint traffic engineering （P2MP TE） are true？ （）
A
P2MP TE uses an OSPF extension that is different from the OSPF extension that is used in P2P TE
B
Loose path is not supported in P2MP TE
C
Multiple IP multicast groups can map to one P2MP tunnel
D
Affinity is not supported in P2MP TE
E
P2MP TE uses Constrained Shortest Path First （CSPF） to calculate paths
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