Hi Piwo,
Just to confirm : With Pagp the max number ports to form an Etherchannel should be 8 and with Lacp 16 (where 8 are active and the other 8 will be acting as backup ports)
Correct. Truth be told, I have not yet seen a production network where the number or physical ports in a single Port-channel would be 8 or more; in fact, the highest number I usually see is 4. This is of course not to say that such deployments do not exist, but I would personally consider them to be quite rare.
However, in Packet Tracer it is possible to configure a port channel with no number of limit ports.
That is an imperfection in Packet Tracer. You have to keep in mind that Packet Tracer does not internally run IOS or faithfully emulate the hardware of routers and switches; it just mimics their behavior but there are limits to the accuracy of this simulation.
Is it possible to have an interface configured for diferent group channels?
No, this is not possible. A physical interface can be a member of at most one Port-channel. Two different Port-channels must use distinct physical interfaces.
Feel welcome to ask further!
Best regards,
Peter
