According to the shortcomings of existing network topology generation algorithms

based on the study of the topology auto-generation algorithms in large-scale Heterogeneous Intra-AS Network（HIAN）

a network-layer topology generation algorithm is put forward

which can solve the conflicts among network nodes

and a switch-layer topology generation algorithm is also put forward.Take the network-layer and the physical layer realization independently strategy

simplified each layer interconnection

was advantageous for clearly and reasonable to presents the complex topology

increased the manual regulation function

achieved the layout on each to be reasonable.The algorithms can generate multi-layers topology automatically

solve the problems of overlap

intercross

unreasonable layout of nodes in network topology.The productions have good effects in practical application.which provides an effective way of probing the aimed network without authorization.