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For down bandwidth, you could police the ingress traffic. NB: policing can be somewhat harsh.
For up bandwidth, you can direct each customer's traffic to one of your four egress queues and shape each of those two queues. Or, you could also "shape" the port at 500 Mbps, and set bandwidth proportions 2:3 (this would allow either customer to use the other customer's unused bandwidth [something you normally do within an Enterprise, but likely not what you want to do for customers]).
