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Since the linecards are described as non-blocking do I need to worry about how I connect/group various portchannels?
On those line cards, with a sup7E, you can connect to any port you desire.
A best practice would be to distribute 3 ports from each portchannel to each of the WS-X4748-RJ45-E - correct?
Assuming you want to minimize the bandwidth loss to each portchannel if a line card fails, yes.
I have seen/read questions about ASIC oversubscription for other switches (3K fixed) and line cards, but cannot find anything similar for the WS-X4748-RJ45-E.
That because the "intelligence" for 4500s is within the sup, not the line cards.
