Bandwidth constraint model is a key component in differentiated service aware MPLS traffic engineering. DSTE supports classes and allows contraint-based routing. DSTE enhance the ability of MPLS TE bandwith reservation on a link based on per class definition. maximun allocation model is one of the bandwidth constraint model, which is defined as one-to-one relationship with the defined class type. in this paper,we evalute the performance of DSTE where mqaximun allocation model ( DSTE MAM) is used as bandwidth constraint. the performance is also compared to original MPLS TE. as the result, MAM can improve network performance significantly in term of throughput, end-to-end delay, packet loss and link utilization.