[多选题]

下面当主接口由up转为down后哪种说法正确?()

A .当主接口由up转为down后,立即切换到备份接口。

B .当主接口由down转为up后,立即切换回主接口。

C .当主接口由up转为down后,等待一定时间后,若主接口状态仍为down,才切换到备份接口。

D .当主接口由down转为up后,等待一定时间后,若主接口状态仍为up,才切换回主接口。

参考答案与解析:

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