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question in port channels

I have 2 cisco core switches and 3 access layer switches. I will be using 6  gigabit ports from the core switch to create 3 port channels , one for every access layer switch.
My 3 questions are :

1. the first two ports on the core will form port channel group 1 , the other two port channel goup 2 and the next 2 , port channel group 3 , right ? Each group will have a different id number..
2. where will i put the command switch port trunk allow vlan all... to the core or on the access switches , or on both ?
3. On the access layer switch , when i create the port group what id will i be using ? I would assume it has to match the id on the core switch , right ?
1 Solution
1. Yes, but  . . . if you spread them out on the switch, you will have better resiliency and performance.
For example, ports 1-2 = PO1, ports 13-14= PO2, ports 25-26 = PO3, etc
Reason is that port groups on a single switch share the same asic chips and if you put all of the port channels on the same chip you will not get the performance you want.
2. If you set up the individual ports with the trunk commands before you add them to the channel group, then the channel group will inherit them automatically.
3. Doesn't really matter. The ID is only significant to be unique on the local switch.
c_hocklandAuthor Commented:
many thanks!!

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