A.不發(fā)送BPDU,但接受BPDU,一旦接收到BPDU后,就開(kāi)始恢復(fù)生成樹(shù)的轉(zhuǎn)發(fā)延遲等特性
B.發(fā)送BPDU,接受BPDU,一旦接收到BPDU后,會(huì)進(jìn)行生成樹(shù)協(xié)議計(jì)算
C.發(fā)送BPDU,不接受BPDU
D.即不發(fā)送BPDU,也不接受BPDU,因?yàn)閜ortfast表明了所連接的接口是主機(jī)端口,沒(méi)有必要發(fā)送和接收BPDU