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
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.