Configuring Etherchannel on an Existing switch

I would like to know which precautions should be taken before configuring an Etherchannel on an existing switch .

The Existing Switch is connected to other switches as well.
I do not want to cause a loop or any other mishaps.

Thank you
jskfanAsked:
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
As long as you are not creating a ring, there should be no issues as spanning tree should take care of everything.
eeRootCommented:
First, save and backup the config on both switches.  Then create the ether-channel interface on both switches, then add one of the physical interfaces to the ether-channel interface, then verify that it shows as up, then add the second.  And use the "reload in 10" command (if your switch has it) to automatically reboot the switch without saving changes if the change is unsuccessful and you loose access.  Cancel the reload if the change is successful.
jskfanAuthor Commented:
What I am looking for is like Jumping battery of other car instructions:

if I grab 2 cables and connect them to both switches ,before configuring the ports as etherchannel, it might cause a loop, though STP can prevent it.
Before cable connections between switches, I need to configure both ports on each switch as etherchannel , then plug the cables one at a time on each port...
looking for safest way to avoid the loop
eeRootCommented:
Two connection will not create a loop, because spanning tree will set one of them as the active root and the other as a secondary.  After you create the etherchannel interface on both switches, add the physical interfaces one at a time.  The only precautions I recommend is save the configs before the change & to use the "reload in 10" command in case there is some unforeseen issue and you loose connectivity.

     If you want to be extra careful, you can "shut" one of the ports so that there is only one working connection, then add the inactive ports to the etherchannel before bringing the ports back online with "no shut"  (assuming this is a Cisco switch)

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jskfanAuthor Commented:
Thanks I will get back to this later
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