单选题In BGP graceful restart, how does a peer router indicate the end of a route exchange?（）A an open message with the E bit setB an update message with the E bit setC an open message with an end-of-RIB markerD an update message with an end-of-RIB marker
题目
单选题
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