[BCMSN]试验10 配置生成树Port Fast

sw1(config)#int f0/1 

sw1(config-if)#spanning-tree portfast 

%Warning: portfast should only be enabled on ports connected to a single host.
Connecting hubs, concentrators, switches,  bridges, etc.to this interface
when portfast is enabled, can cause temporary spanning tree loops.
Use with CAUTION

%Portfast has been configured on FastEthernet0/1 but will only
have effect when the interface is in a non-trunking mode.

系统提示请不要将2层设备接入Portfast端口上