I am replacing out a pair of 5500s with 6509s one-at-a-time. Once the first 6509 is replaced, it will be trunked via FEC (FastEtherchannel) to the 5500 until that 5500 can be replaced. I want to verify that my the FEC I plan to use will, in fact, work. I plan on creating a PO1 on the 6509 ( w/ channel-group 1 mode desirable on each gig interface: 1/47, 1/48, 2/47, 2/48) and using 4-port etherchannel (1/47-48, 2/47-48). On the 5500, I plan on using 8/23-24, 9/23-24 and have the following in place:
set port channel 8/23-24 mode on
set port channel 8/23-24 mode desirable
set port channel 9/23-24 mode on
set port channel 9/23-24 mode desirable
I am wondering if I need to change the 5500 end to, perhaps, either 8/21-24 or 9/21-24, as the 6500 end has a 4-port etherchannel.
Any input would be greatly appreciated.