Etherchannel Configuration / Link Bonding / Link Aggregating Configuration

Etherchannel Configuration Manual

To configure link bonding between SW A and SW B First Configure STP in both switch.
Detail configuration for LACP (Link aggregation control protocol):

SW A:

SWA(config)#lacp system-priority <0-65535> [optional. default 32768. lower value is preferred.]
SWA(config)#interface range fa 0/1 – 2

SWA(config-if-range)#switchport mode trunk
SWA(config-if-range)#channel-protocol lacp
SWA(config-if-range)#channel-group 1 mode active
SWA(config-if-range)#lacp port-priority <0-65535> [optional. default 32768. lower value is preferred.]
SWA(config-if-range)#exit
SWA(config)#interface port-channel 1
SWA(config-if)#switchport mode trunk

SW B:

SWB(config)#lacp system-priority <0-65535> [optional. default 32768. lower value is preferred.]
SWB(config)#interface range fa 0/1 – 2

SWB(config-if-range)#switchport mode trunk
SWB(config-if-range)#channel-protocol lacp
SWB(config-if-range)#channel-group 1 mode active
SWB(config-if-range)#lacp port-priority <0-65535> [optional. default 32768. lower value is preferred.]
SWB(config-if-range)#exit
SWB(config)#interface port-channel 1
SWB(config-if)#switchport mode trunk

Detail configuration for PAgP (port aggregation protocol):

SW A:

SWA(config)#interface range fa 0/1 – 2

SWA(config-if-range)#switchport mode trunk
SWA(config-if-range)#channel-protocol pagp [Optional. because by default cisco use pagp]
SWA(config-if-range)#channel-group 1 mode desirable
SWA(config-if-range)#pagp port-priority <0-255> [optional. default 128. lower value is preferred.]
SWA(config-if-range)#exit
SWA(config)#interface port-channel 1
SWA(config-if)#switchport mode trunk

SW B:

SWB(config)#interface range fa 0/1 – 2

SWB(config-if-range)#switchport mode trunk
SWB(config-if-range)#channel-protocol pagp [Optional. because by default cisco use pagp]
SWB(config-if-range)#channel-group 1 mode desirable
SWB(config-if-range)#pagp port-priority <0-255> [optional. default 128. lower value is preferred.]
SWB(config-if-range)#exit
SWB(config)#interface port-channel 1
SWB(config-if)#switchport mode trunk

Detail Static configuration :

SW A:

SWA(config)#interface range fa 0/1 – 2

SWA(config-if-range)#switchport mode trunk
SWA(config-if-range)#channel-group 1 mode on
SWA(config-if-range)#exit
SWA(config)#interface port-channel 1
SWA(config-if)#switchport mode trunk

SW B:

SWB(config)#interface range fa 0/1 – 2

SWB(config-if-range)#switchport mode trunk
SWB(config-if-range)#channel-group 1 mode on
SWB(config-if-range)#exit
SWB(config)#interface port-channel 1
SWB(config-if)#switchport mode trunk

Verify etherchannel:

#sh etherchannel port-channel

#sh etherchannel load-balance
#sh interfaces port-channel 1 switchport
#sh etherchannel summary
#sh etherchannel detail
#sh etherchannel protocol
#sh etherchannel port
#sh pagp ………
#sh lacp ……….