I was working through Switching Fundamentals - Part One lab for Cisco 200-301 and discovered some weird behavior. I received an error when issuing the '
NYCORE1(config-if)#channel-group 1 mode pass
NYCORE1(config-if)#channel-group 1 mode passive
Command rejected (Channel protocol mismatch for interface Fa1/0/23 in group 1): the interface can not be added to the channel group
Why would the FA 1/0/23 remove itself from the channel-group automatically? What could be the cause of this behavior?