In the student guide "Implementing Cisco Switched Networks" Volume 1 (page 2-61) are only the following LACP mode combinations mentioned:
On (Channel) On
On/Active/Passive (No Channel) Off
Active/Passive (Channel) Active
Passive/On (No Channel) Passive
What is with the missing following LACP mode combination?
On (?? Channel) Active
Will it build a Channel or No Channel?
In order to form a LACP channel you can only combine these:
Active - Active
Active - Passive
On - On
Any other combination will not properly form the LACP channel. As a side note i recommend you to always use a negotiation parameter, for example the "Active", because the "On" mode is not negotiation per se an could lead into layer 2 loops in certain cases, eventhough there is a feature for misconfigurations like these where STP protect the ports putting them into the err-disable state, you could try that in your lab, the feature is called "STP channel-misconfig" and is on by default.
Message was edited by: Elvin Arias