用gns3加载3640ios做的
1,R1(config)#int port-channel 1
R1(config-if)#channel-group 1 mo on
R1(config-if)#int f0/1
R1(config-if)#channel-group 1 mo on
R1(config-if)#int f0/2
R1(config-if)#channel-group 1 mo on
R1#show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
R - Layer3 S - Layer2
U - in use
Group Port-channel Ports
-----+------------+-----------------------------------------------------------
1 Po1(SU) Fa0/0(P) Fa0/1(P) Fa0/2(P)
R2:R2(config)#int port-channel 1
R2(config-if)#channel-group 1 mo on
R2(config-if)#int f0/1
R2(config-if)#channel-group 1 mo on
R1(config-if)#int f0/2
R1(config-if)#channel-group 1 mo on
R1#show etherchannel summary
Flags: D - down P - in port-channel
I - stand-alone s - suspended
R - Layer3 S - Layer2
U - in use
Group Port-channel Ports
-----+------------+-----------------------------------------------------------
1 Po1(SU) Fa0/0(P) Fa0/1(P) Fa0/2(P)