I am in the process of planning the configuration of a new Etherchannel from our 3750-24-TS switches to our 4507's.
We currently have 2 x server racks each with 2 x 3750's in them. Each of the 3750's is currently connected back to a 4507 via 2 x SFP (RJ45) modules (there is a 2Gb etherchannel configured between each 3750 and their respective 4507).
What I plan to do is to stack each pair of 3750's and then create 1 x 4Gb EC back to their respetive 4507.
I have upgraded the IOS on all 3750's to the same revision (12.2(25)SED1) so that I can use the cross stack etherchannel feature.
Could somebody clarify that a LACP EC is the way to go in order to have a single 4Gb EC ? (I have tried using PAgP but the 3750 stack states that the interfaces need to be on the same switch when configuring the PAgP EC).
I have attached the proposed config to this call for referecne.
Thanks in advance.