单选题Catalyst 6500（Catalyst OS系统）中设置主root的命令格式是（ ）。Aspanning-tree lanvansroot primaryBspanning-tree lanvansroot secondaryCset spantree rootvansDset spantree root secondaryvans
单选题
Catalyst 6500（Catalyst OS系统）中设置主root的命令格式是（ ）。
A
spanning-tree lan<vans>root primary
B
spanning-tree lan<vans>root secondary
C
set spantree root<vans>
D
set spantree root secondary<vans>
参考解析
解析：
选项A、B分别是Catalyst 3500（CiscoIOS系统）的STP主root、备份root设置命令；选项D是Catalyst 6500（Catalyst OS系统）的STP备份root设置命令，故选C。
选项A、B分别是Catalyst 3500（CiscoIOS系统）的STP主root、备份root设置命令；选项D是Catalyst 6500（Catalyst OS系统）的STP备份root设置命令，故选C。
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