Under the constraints of the number of transceivers per node and wavelength continuity,the integrated routing(IR) in IP over WDM networks was investigated.A novel auxiliary graph model(AGM) was proposed to represent current state of the network.Based on AGM,an efficient dynamic IR scheme,minimal transceiver approach(MTA),was developed.It always routes an arriving connection request over the path with the least number of transceivers used by newly created lightpaths.The simulation results show that MTA can improve the blocking probability and the traffic throughput considerably compared to the existing methods.And MTA results in lesser number of O-E-O conversions in favor of QoS.