加快Catalyst 3548发生直接链路失效时的收敛速度，正确配置生成树可选功能的命令是A．spanning-tree backbonefastB．spanning-tree portfast defaultC．spanning-tree uplinkfast max-update-rate 32000D．set spantree uplinkfast enable rate 40
加快Catalyst 3548发生直接链路失效时的收敛速度，正确配置生成树可选功能的命令是
A．spanning-tree backbonefast
B．spanning-tree portfast default
C．spanning-tree uplinkfast max-update-rate 32000
D．set spantree uplinkfast enable rate 40
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