A.RoutermustbeABR
B.Routermustcontainoneshamlink.
C.Thenetworktopologymustbestable.
D.Routermustbeabletoforwardpackets.
E.Neighborsmustsupportgracefulrestart.
参考答案：CDE
ARoutermustbeABRBRoutermustcontainoneshamlinkCThenetwork
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