Considering dynamic change of load flow and the effect of local congestion status on routing in real large ̄scale communication networks,a cascading failure model with tunable pa ̄rameters is introduced. Cascading behaviors in homogeneous ER ( Erd?s ̄Rényi ) random and heterogeneous BA(Barabási ̄Albert) scale ̄free networks subject to intentional attacks on node are compared,and the effect of packet generation rate,routing parameter and size of different topological networks on the failure propagation is investigated.According to the critical...