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中文摘要：
针对Internet核心网日益严重的能耗问题，建立了绿色虚拟拓扑设计（GVTD）问题的形式化模型，通过业务汇聚、按需配置网络资源、动态虚拟拓扑设计和多粒度睡眠机制降低网络能耗。提出了一种基于约束路由的启发式算法--CBR-GVTD算法，利用单跳路由和多跳路由相结合的方法构建网络虚拟拓扑，并通过基于约束的路由实现网络功耗与路由性能的折衷。模拟结果表明，CBR-GVTD算法可在接口平均利用率为80%~90%和最大路由跳数不超过5的条件下，最多可降低62%~90%的网络功耗。
英文摘要：
To reduce the energy consumption of Internet core network, a formulation model for green virtual topology design （GVTD） problem was developed, which employs the following measures：traffic aggregation, network resources allocation on demand, virtual topology design dynamically and multi-granularity sleeping. A heuristic algorithm base on constraint-based routing, namely CBR-GVTD, was proposed, which combines the single-hop and multi-hop routing to establish virtual topology, and makes trade-offs between the network power consumption and routing performance via the constraint-based routing mechanism. The simulation results indicate that CBR-GVTD can achieve at most 62%~90%power saving with very high resource utilization （80%~90%for interface utilization） and excellent routing performance （not more than 5 for maximum routing hops）.
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