单选题In IS-IS， how long will the restart helper keep the restarting router in the up state？（）AThe hello dead timer expires.BThe restart duration timer expires.CThe restarting router sets the down bit.DThe restart helper sends out three CSNPs.
单选题
In IS-IS， how long will the restart helper keep the restarting router in the up state？（）
A
The hello dead timer expires.
B
The restart duration timer expires.
C
The restarting router sets the down bit.
D
The restart helper sends out three CSNPs.
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