Etherchannel : Pagp or Lacp

Pagp or lacp are used to automatically negotiate etherchannel bundle :

Pagp (Cisco protocol):
auto : passive negotiation, other side needs too be desirable
desirable : active negotiation, other side needs too be desirable or auto.

Lacp (802.3ad)
passive : passive negotiation, other side needs to be active
active : passive negotiation, other side needs to be active or passive.

The main differences between both is Pagp only works in cisco environment whereas lacp works in mixe environment

To manually force the etherchannel, both sides have to be in on mode.

Verification

Rack1SW2#sh etherchannel 1 sum
Flags: D - down P - in port-channel
I - stand-alone s - suspended
R - Layer3 S - Layer2
U - in use
Group Port-channel Ports
-----+------------+-----------------------------------------------------------
1 Po1(SU) Fa1/7(P) Fa1/8(P) Fa1/9(P)

OR

Rack1SW2#sh etherchannel 1 port
Ports in the group:
-------------------
Port: Fa1/7
------------

Port state = Up Mstr In-Bndl
Channel group = 1 Mode = On/FEC Gcchange = 0
Port-channel = Po1 GC = 0x00010001 Pseudo port-channel = Po1
Port index = 2
Age of the port in the current state: 00d:03h:17m:20s
Port: Fa1/8
------------

Port state = Up Mstr In-Bndl
Channel group = 1 Mode = On/FEC Gcchange = 0
Port-channel = Po1 GC = 0x00010001 Pseudo port-channel = Po1
Port index = 1
Age of the port in the current state: 00d:03h:17m:20s