Ether-channel链路捆绑
SW1：
interface fastethernet 0/1 - 3
channel-group 1 mode on
show ip interface brief
interface port-channel 1
interface fastethernet 0/4 - 6
channel-group 2 mode on
show ip interface brief
interface port-channel 2
SW2：
interface fastethernet 0/1 - 3
channel-group 1mode on
interface fastethernet 0/4 - 6
channel-group 2 mode on
interface port-channel 1
exit
show ip interface brief
SW3...
