Hello,
Well if the port your trying to use (the free port) is in a portchannel you should do one of this 2 Options:
A.Use a user port to connected the new switch and move the user to the new switch temporarily:
A.1- You should connect the cable that was disconnectedthat will make the port channel second link to come back
A.2- If you have another user port that you may use configure that port has a trunk and send the vlan that was in the user port to pass to that trunk and the one you need for that training room.
A.3- Then if you can one of the free port of the training room Switch to connect the user temporarily then do the rollback of that user.
B.Disable the port channel on both Switches and then use the existing free port for the temporarily :
Switch:
B.1- Find the two Hardware that are on that port channel, then disable the port channel on both switches.
B.2- Then use the Free port of the existing switch as a trunk and connect the new Switch in trunk mode and send the valns you need throught the port.
B.3 went the time comes do the rollbkack and recreate the port channel on the twot Hardware that you find on the B.1 and reconnnect them till you get both port´s up in the port channel.
If you need more help, send a diagram of the physical topology and i can help you a bit more.
Gerardo Andree Mejía
