// Returns bandwidth that is available on given interface.
            public uint AvailableBandwidthAt(byte interfaceId)
            {
                BWPair bwpair = database[interfaceId];

                return(bwpair.capacityBw - bwpair.assignedBw);
            }
            // Returns bandwidth that is assigned on given interface.
            public uint AssignedBandwidthAt(byte interfaceId)
            {
                BWPair bwpair = database[interfaceId];

                return(bwpair.assignedBw);
            }