Hello, I'm practicing forming Etherchannel groups and I have a question. I have two switches with Fa 0/5, 6 ,7 as trunks between the switches. When create the Po1 adding each interface one by one (first in one SW and then in the other SW) my Po1 goes to an err-disabled status in the first SW. Then I have to enter into the Po1 interface, apply a shutdown and then a no shutdown and then the Po1 comes up........ is this a normal behavior when you add each interface one by one to the Po? .... see the attachment.

When I create the Po1 by adding the 3 interfaces together (int range fa 0/5 - 7) in one SW the interfaces go down. Then I do the same in the other SW and once the Po1 has been configured in both SWs the Po1 comes up by itself I dont have to apply a shu/no shut to the Po1 interface.

Is there a way to create a Po without interrupting traffic? What is the normal or best way to create the Po?