问题：
[多选题]3. PIM-SM路由器R1向其上游邻居发送了一条(S，G)RP-bit剪除消息。假设网络中的所有PIM-SM路 由器使用的都是Cisco默认的spt-threshold值，那么下面有关PIM-SM网络中不同路由器的当前状态的 描述，哪些是正确的?
A.根路径树与最短路径树在R1位置处分叉
B.R1从最短路径树切换到根路径树
C.R1从根路径树切换到最短路径树
D.(S，G)表项的RPF邻居与(*，G)表项的RPF邻居在R1位置处不同
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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