问题：
[多选题]2. 下面有关PIM-SM RP路由器何时向第一跳DR发送单播PIM Register-Stop(停止注册)消息的描述， 哪些是正确的?
A.如果RP不需要该流量
B.如果RP已经收到了该共享树的流量
C.RP开始从多播源接收多播流量的时候
D.RP通过SPT向下游路由器发送多播流量的时候
Tags：思科认证CCIE路由和交换分类模拟试题
答案解析：
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