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Uplink sizing starts from peak concurrent demand rather than the sum of port speeds, then adds headroom to keep utilisation near 70 percent. The critical check is failure: with two uplinks in a bundle, losing one doubles the load on the survivor, so a design that runs at 60 percent normally will saturate the moment a link or line card fails.
Uplink sizing
peak = devices x per-device rate x concurrency; required = peak / 0.7; per uplink = required / uplink count; failure load = required / (uplinks - 1)
No. Hashing on flow tuples means a few large flows can land on one member, so a bundle rarely reaches the sum of its members for a small number of heavy flows.
Yes, with MLAG or equivalent. Two uplinks to the same switch protect against cable and port failure but not against device failure.