BCMSN Lab - Layer 2 Etherchannel Configuration: LACP [CCNP]

Configuring LACP between S2 and S4

S2#conf t
S2(config)#int range fa0/3 - fa0/4
S2(config-if)#channel-protocol lacp
S2(config-if)#channel-group 1 mode on
S2(config-if)#exit

S4#conf t
S4(config)#int range fa0/3 - fa0/4
S4(config-if)#channel-protocol lacp
S4(config-if)#channel-group 1 mode on
S4(config-if)#int fa0/1 (not necessary but might as well do it)
S4(config-if)#switchport mode access (not necessary but might as well do it)
S4(config-if)#spanning-tree portfast (not necessary but might as well do it)

and that's it...