Link Aggregation by EtherChannel using PAgP or LACP

Note: Both ends of the channel must be configured to use the same interface range and protocol.
Mismatch will cause the entire LAN to go down.


Do below for S1. Do the same for S2.

S1 (config) # int range f0/3-4

For PAgP
S1 (config-if-range) # channel-group 1 mode desirable

For LACP
S1 (config-if-range) # channel-group 1 mode active

S1 (config-if-range) # no shut

S1 (config-if-range) # do show etherchannel summary / do sh e s


S1 (config) # int port-channel 1
S1 (config-if) # switchport mode trunk
S1 (config-if) # switchport trunk native vlan 99