对新型网络路由机制的思考

Considerations on Novel Network Routing Mechanisms

路由是网络的结构基石,新型网络路由机制是构建新型网络体系的必需。目前网际层的路由本质上是所谓的"单下一跳路由"机制,解决网络传输拥塞问题的一个根本措施在于改变当前网络单下一跳的选路模式,允许多条路径的并行传输。边界网关协议(BGP)是目前Internet唯一采用的域间路由协议,针对当前域间路由系统面临的规模可扩展性问题,文章提出了一个规模可扩展的新型分层域间路由架构(s-idra)。除了可扩展性以外,路由体系还面临其他挑战,比如安全性、服务质量(QoS)、组播、移动、动态网络拓扑等等。路由协议尤其是未来新型信息网络体系结构的路由协议的研究任重而道远。

Since routing is the cornerstone of a network, constructing new routing mechanisms is indispensable to novel network architectures. The present nature of current routing mechanisms in the network layer is based on the so-called single-next-hop. Therefore, a radical solution to network transmission congestion problem is required to change from the single-next-hop mode to something else to allow simultaneous traffic transmission on multiple paths. The Border Gateway Protocol （BGP） is now the unique inter-domain routing protocol used in the Internet. A new scalable hierarchical inter-domain routing architecture （s-idra） is proposed here to deal with the scalability problem posed to the current inter-domain routing. Other than scalability, the routing system is facing other challenges such as security, Quality of Service （QoS）, multicast, mobility and adaptability to dynamic network topologies. Researches on routing protocols, especially on those employed in future information network architectures, will shoulder heavy responsibilities.