If using all cisco devices we use pagp just because it has been around the longest and is very stable to setup the channels . Negotiating the channels lets the switch look at different parameters and makes sure they are all the same on each end so no problems occur , if they are not then the switch will not form the channel .LACP is the IEEE standard for etherchannel . A major warning out of a cisco doc.
Serious traffic problems can result from mixing manual mode with PAgP or LACP modes, or with a port with no EtherChannel configured. For example, if a port configured in on mode is connected to another port configured in desirable mode, or to a port not configured for EtherChannel, a bridge loop is created and a broadcast storm can occur. If one end uses the on mode, the other end must also.
We are pleased to announce availability of Beta software for 16.6.3. 16.6.3 will be the second rebuild on the 16.6 release train targeted towards Catalyst 9500/9400/9300/3850/3650 switching platforms. We are looking for early feedback from custome...