基于内容轨迹的内容中心网络多径路由策略  

Content Trace Based Multi-Path Routing Scheme in Content Centric Networking

作　　者：张岩[1] 黄韬[1] 刘江[1] 陈建亚[2] 刘韵洁[1] 

机构地区：[1]北京邮电大学网络与交换技术国家重点实验室,北京100876 [2]北京邮电大学网络体系构建与融合北京市重点实验室,北京100876

出　　处：《北京邮电大学学报》2014年第3期98-103,共6页Journal of Beijing University of Posts and Telecommunications

基　　金：国家重点基础研究发展计划项目(2012CB315801);国家自然科学基金项目(61300184);中央高校基本科研业务费专项资金项目(2013RC0113)

摘　　要：内容中心网络路由的研究主要关注利用转发信息库端口来获取到达服务器的最优路径,路由路径外的节点缓存中内容无法得到充分利用.而利用多个转发信息库端口的多径路由虽可对缓存充分利用,但会带来冗余传输.针对这些问题,提出了一种基于内容轨迹的多径路由策略,利用内容轨迹将兴趣报文引导至原有路由表路径外的缓存处,使兴趣报文在到达服务器前搜索更多缓存,增加网内缓存命中率,减小服务器负载和兴趣报文平均跳数,并将多径路由冗余控制在一定范围内.仿真结果表明,基于内容轨迹的多径路由策略相对现有策略服务器负载降低约10%,且在服务器较远的场景下可有效降低请求平均跳数.相对于单径路由,基于内容轨迹的多径路由策略将网内缓存命中率提升了约20%;相对于多径路由冗余降低10%以上,且具有相近的网内缓存命中率.Current researches on content centric networking routing mainly focus on selecting the best routing path from forwarding information base （FIB）. The path leads the requests to the server, so only the on-path caches are currently used, which results in low utilization of the in-network caches. More caches can be exploited if more FIB faces are used for muhipath routing, but it will bring a lot of redundancies. To solve these problems, a content trace multi-path routing （CTMR） scheme is proposed. In this scheme, Interest packet is sent to the caches along with the traces of the former Data packet. Therefore, the Interest packets are routed to the in-network cache resources before they routing to the server, the utilization of the in-network caches is increased with a little redundancy, while the server load is decreased. Simulation shows that the CTMR decreases the server load about 10% and reduces the mean hops compared with the existing schemes. The cache hit rate in CTMR is increased about 20% relative to the single path routing. The redundancy in CTMR is reduced by more than 10% with the similar cache hit rate relative to the muhipath routing.

关 键 词：内容中心网络 多路径路由 内容轨迹 多径搜索表 

分 类 号：TP915.02[自动化与计算机技术]