Routing Selection of Dual-Multihoming Network Based on BGP Protocol

In order to optimize the export structure of campus network, in the GNS3 simulation environment, I designed a simulation experiment of routing selection for dual-multihoming network.This paper presents a network optimization scheme.It introduces dual-multihoming ISP lines and deploys BGP, EIGRP and other dynamic routing protocols at the outlet of campus network, and expounds in detail the configuration methods of EBGP multi-hop, IBGP, modifying BGP next-hop attributes and modifying BGP local preference.The test result proves that this scheme can solve the main problems faced by the current campus network well.The optimized campus network not only improves the reliability, but also enables the data flow of the users of the campus network to access the Internet resources according to the best path.