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单选题
提高Caralyst 6500发生直接链路失效的收敛速度,正确配置STP可选功能的命令是(  )。
A

set spantree backbonefast enable

B

set spantree uplinkfast enable

C

set spanttee portfast 3/2 enable

D

set spantree portfast bpdu-filter enable


参考答案

参考解析
解析:
A选项中backboneFast的功能是使阻塞端口不再等待这段时间,而是直接将端口由侦听和学习状态转换为转发状态,C、D中portlast的功能是使交换机的端口跳过侦听和学习转态,直接从阻塞状态进入转发转态,而uplinkfast功能是提高发生直接链路失效的收敛速度。
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