In BGP graceful restart， how does a peer router indicate the end of a route exchange？（）
- A、An open message with the E bit set.
- B、An update message with the E bit set.
- C、An open message with an end-of-RIB marker.
- D、An update message with an end-of-RIB marker.
正确答案:D
答案解析:有
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