Methods, systems, and devices utilizing port dimensioning strategies for supporting, for example, bandwidth-on-demand (“BoD”) services in networks. At a given node, the traffic load consists of several components, such as an access component, which is generated by demands terminated at that node, and a transit component, which is generated by demands that transit electronically through the node. Given the BoD load at a node, as well as a target BoD average blocking probability, a desired static allocation of the ports is provided between ports of a first type (such as client-side ports) and ports of a second type (such as network-side ports). In addition, a dynamic sharing strategy of the ports is also disclosed.