以太网以实时、高速、智能化以及可扩展性等特点越来越受列车车载网络的青睐,而如何提高列车车载以太网的可靠性、稳定性和安全性却成为关注的重点。本文分析了生成树协议、快速生成树协议、环网冗余协议和MRP冗余网络协议等以太网冗余技术的优缺点,提出了有效提高车载以太网的可靠性、稳定性和安全性的措施。 Ethernet is more and more favored by train car network in real time, high speed, intelligence and scalability, and how to improve the reliability, stability and safety of train car Ethernet has become the focus of attention. This paper analyzes the merits and demerits of Ethernet redundancy technologies such as Spanning Tree Protocol, Rapid Spanning Tree Protocol, Ring Redundancy Protocol and MRP Redundant Network Protocol, and puts forward some effective measures to improve the reliability, stability and security of Ethernet in vehicle Measures.