根据下面的输出,可对 EtherChannel 束做出下面哪种判断? S1# show etherchannel summary ......< 输出略 >.... Number of channel-groups in use: 1 Number of aggregators: 1 Group Port-channel Protocol Ports ----------+---------------------+---------------+---------- 1 Pol(SU) PAgP Fa0/1(P) Fa0/2(P) ......< 输出略 >....