I'm looking for a solution to guarantee a particular LAN segment a particular amount of internet bandwidth. As an example, if the ISP connection is 100Mbps, then I want allow a segment of the LAN and all of its connected clients to have access of up to 80Mbps and any of the other LAN segments the remaining 20Mbps. The reason for this is separate organization's cost sharing the price of just one incoming cable broadband ISP. The current setup is a standard cable modem which then feeds to a SOHO router (primarily used for internal DHCP) and then to a mix of managed (layer2/3 capable) switches to several buildings on campus. I'm open to adding a capability or replacing any of the current devices that could allow for this type of bandwidth control.