Which two of these statements regarding RSTP are correct?（）
- A、RSTP cannot operate with PVST+.
- B、RSTP defines new port roles.
- C、RSTP defines no new port states.
- D、RSTP is a proprietary implementation of IEEE 802.1D STP.
- E、RSTP is compatible with the original IEEE 802.1D STP.
正确答案:B,E
答案解析:有
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