Earlier, the section titled “Configuring EtherChannel” listed the small set of working configuration options on the channel-group command. Those rules can be summarized as follows, for a single EtherChannel:
1. On the local switch, all the channel-group commands for all the physical interfaces must use the same channel-group number.
2. The channel-group number can be different on the neighboring switches.
3. If using the on keyword, you must use it on the corresponding interfaces of both switches.
4. If you use the desirable keyword on one switch, the switch uses PAgP; the other switch must use either ...