摘 要
随着网络规模的不断扩大和业务需求的日益复杂，传统网络架构在跨域流量调度方面面临可扩展性差、管理分散等瓶颈问题。软件定义网络（SDN）技术通过控制与转发分离的架构，为实现灵活高效的流量工程提供了新思路。然而，现有研究多集中于单域场景，对跨域协同优化的支持仍不完善。为此，本文提出一种基于SDN的跨域流量工程优化策略，旨在提升多域网络环境下的资源利用率与服务质量。该策略采用分层控制架构，结合全局路径计算与分布式局部调整机制，在保证可扩展性的同时实现负载均衡与低延迟传输。实验基于真实网络拓扑与流量数据，结果表明，所提方法在网络吞吐量提升、端到端时延降低及链路拥塞率控制方面均优于传统方案。本研究的主要创新在于构建了一个支持动态域间协作的流量工程框架，并设计了兼顾全局优化与本地响应的双层调度算法。研究成果为大规模SDN网络的高效运行提供了理论支持与实践指导。
关键词：软件定义网络；跨域流量工程；分层控制架构；动态域间协作；双层调度算法
An Optimization Strategy for Cross-Domain Traffic Engineering Based on Software-Defined Networking
Abstract: With the continuous expansion of network scale and the increasing complexity of service requirements, traditional network architectures face bottlenecks in cross-domain traffic scheduling, such as poor scalability and decentralized management. Software-Defined Networking (SDN) technology offers new possibilities for achieving flexible and efficient traffic engineering through its architecture separating control from forwarding planes. However, existing research primarily focuses on single-domain scenarios, with insufficient support for cross-domain collaborative optimization. To address this issue, this paper proposes an SDN-based cross-domain traffic engineering optimization strategy aimed at improving resource utilization and service quality in multi-domain network environments. The proposed strategy adopts a hierarchical control architecture, integrating global path computation with distributed local adjustment mechanisms, thereby achieving load balancing and low-latency transmission while maintaining scalability. Experiments are conducted based on real-world network topologies and traffic data, and the results demonstrate that the proposed approach outperforms traditional methods in terms of network throughput improvement, end-to-end delay reduction, and link congestion control. The main contributions of this study lie in constructing a traffic engineering fr amework that supports dynamic inter-domain collaboration and designing a two-layer scheduling algorithm that balances global optimization with localized responsiveness. This research provides both theoretical support and practical guidance for the efficient operation of large-scale SDN networks.
Keywords: Software Defined Networking; Inter-Domain Traffic Engineering; Hierarchical Control Architecture; Dynamic Inter-Domain Collaboration; Dual-Layer Scheduling Algorithm
目 录
1绪论 1
1.1研究背景和意义 1
1.2研究现状 1
1.3本文研究方法 1
2软件定义网络中跨域流量调度机制分析 2
2.1跨域网络架构下的流量控制挑战 2
2.2基于SDN的域间路由协调机制设计 2
2.3多域环境中的资源分配与调度模型 3
3跨域流量工程中的路径优化方法 3
3.1多域网络中的路径选择问题建模 3
3.2基于SDN控制器的全局路径优化算法 4
3.3分布式与集中式协同的路径决策机制 4
4跨域流量工程的动态负载均衡策略 5
4.1多域网络中的流量负载分布特征 5
4.2实时流量感知与负载预测模型 5
4.3动态调整下的跨域负载均衡实现 6
结论 6
参考文献 8
致 谢 9
