Etherchannel Configuration & Troubleshooting

Cisco Etherchannel Overview and how it can be configured                            in Cisco Catalyst Switches 

Here lets go to congiure Etherchannel. First of all shutdown all Physical interfaces which u want put in Etherchannel

with shutdown command. 

like

#int range fa0/46-48

#shutdown

 

Now lets go to topology.

ITKESW01#interface range gigabitethernet 0/45-48
                   #shutdown
                  #switchport trunk Encapsulation Dot1q
                 #switchport mode Trunk
                #channel-protocol lacp
               #channel-group 1 mode active

keep it shutdown until you configure the other side switch etherchannel interface.
Note: keep one side channel group active and other side passive this is the best method to configure the etherchannel interface.

ITKESWO2#interface range gigabitethernet 0/1-4
               #shutdown
                  #switchport trunk Encapsulation Dot1q
                 #switchport mode Trunk
                #channel-protocol lacp
               #channel-group 1 mode Passive

now shutdown both interfaces

#int range gigabitethernet0/45-48
#no shutdown

#int range gigabitethernet 0/1-4
#no shutdown

now it will create Port channel

If you have third switch attached then same config but u will create new channel for them. Suppose we have third switch name  ITKESW03 and that switch is connected to  ITKESWO2 , interfaces 5 and 6, and 3 and 4.

ITKESWO2#interface range gigabitethernet 0/5-6
                   #shutdown
                  #switchport trunk Encapsulation Dot1q
                 #switchport mode Trunk
                #channel-protocol lacp
               #channel-group 2 mode Passive

ITKESW03##interface range gigabitethernet 0/3-4
                   #shutdown
                  #switchport trunk Encapsulation Dot1q
                 #switchport mode Trunk
                #channel-protocol lacp
               #channel-group 2 mode active

now no shutdown both Switch interfaces.

and if u want connect third witch to ITKESWO1 
ITKESWO1#interface range gigabitethernet 0/7-8
                   #shutdown
                  #switchport trunk Encapsulation Dot1q
                 #switchport mode Trunk
                #channel-protocol lacp
               #channel-group 2 mode Passive

ITKESWO3#int range gigabitethernet 0/7-8
                   #shutdown
                  #switchport trunk Encapsulation Dot1q
                 #switchport mode Trunk
                #channel-protocol lacp
               #channel-group 2 mode active

commands for Etherchannel
# show etherchannel summary
#show etherchannel details
#show interface port-channel 1 etherchannel
#show etherchannel load-balance

if you want to see specific load balance on your port that you load balance is working or not .

Sw#sh int e3/0 | in packets output


if there is alot packets you cannot see clear just clear the counters.
#clear counters