单项选择题
A.REGISTER机制B.BSR/RP机制C.ASSERT机制D.JOIN/PRUNE机制
A.ROUTE-REFRESH B.OPEN C.KEEPALIVE D.UPDATE
A.AS_PATH B.ORIGIN C.MED D.LOCAL_FREF
A.import isis Ievel-2 into Ievel-1 B.import-route isis level-2 into level-1 C.adVertise isis Ievel-2 into lavel-1 D.export isis Ievel-2into level-1
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