Which message type is constructed and sent from an MSDP router to its MSDP peers when it receives a PIM register message knowing that the MSDP router is also configured as an RP for the PIM domain？（）
- A、Source-Active Message
- B、PIM Join
- C、PIM Hello
- D、MSDP Register
正确答案:A
答案解析:有
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