差不多的东西，用来增加链路带宽并实现链路冗余。
interface Port-channel1switchportswitchport trunk encapsulation dot1qswitchport mode trunk!interface GigabitEthernet3/1switchportswitchport trunk encapsulation dot1qswitchport mode trunkno ip addresschannel-group 1 mode on!interface GigabitEthernet3/2switchportswitchport trunk encapsulation dot1qswitchport mode trunkchannel-group 1 mode on
