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A 3560 supports 4 egress queues, so for your three customers, you could assign each one their own queue with a 1/3 bandwidth ratio allocation. Each would get equal bandwidth when they compete for it, more if it's available.
Although the prior well supports egress bandwidth sharing, sharing ingress bandwidth is more problematic. You could police the inbound bandwidth such that each customer cannot utilize more than 1/3 of the bandwidth, but then they would be unable to utilize available bandwidth and policing downstream doesn't maintain bandwidth restriction under all situations.
