If you want to bind some ethernet interfaces into one logical interface between two ciscos switches you have to configure an interface first:
interface Port-channel 1
then add some interfaces into this new interface:
interface GigabitEthernet 1/0/1
channel-group 1 mode active
and you can check the status with:
show etherchannel 1 summary
Three names for the same thing. Does anybody know, why ?