A native content discovery mechanism for the information-centric networks
A native content discovery mechanism for the information-centric networks
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DOI：
10.1145/3125719.3125734
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发表时间：
2017-09
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通讯作者：
Onur Ascigil;Vasilis Sourlas;I. Psaras;G. Pavlou
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文献类型：
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作者：
Onur Ascigil;Vasilis Sourlas;I. Psaras;G. Pavlou
最近的研究已经考虑了各种方法来发现内容的缓存启用的节点的自治系统（AS），以减少昂贵的AS间的流量。这样的方法包括i）沿着默认AS内路径朝向内容源机会性地（在路径上）搜索内容以获得有限的增益，以及ii）在缓存内容时主动地协调节点以获得显著更高的增益，但也获得更高的开销。在本文中，我们试图通过使用传统的机会主义缓存机制与轻量级的内容发现方法增强，结合联合收割机的优点。特别地，通过AS间链路检索的内容沿着AS内递送路径仅被缓存一次以最大化网络存储利用，并且在数据分组的处理期间，在沿着该路径的每个节点处机会性地建立用于定位临时存储的内容的短暂转发状态。根据内容是否已经沿着路径高速缓存，短暂转发状态指向数据分组的到达面或目的地面。这种方法的挑战是适当地使用和维护短暂的转发状态，以最小化AS间的内容检索，同时将检索延迟和开销保持在可接受的水平。我们提出了几种转发策略来使用和管理短暂的状态，并评估我们的机制，使用ISP拓扑结构的各种系统参数。我们的研究结果表明，我们的机会主义内容发现机制可以实现接近最佳的性能，并显着减少AS间的流量。
Recent research has considered various approaches for discovering content in the cache-enabled nodes of an Autonomous System (AS) to reduce the costly inter-AS traffic. Such approaches include i) searching content opportunistically (on-path) along the default intra-AS path towards the content origin for limited gain, and ii) actively coordinate nodes when caching content for significantly higher gains, but also higher overhead. In this paper, we try to combine the merits of both worlds by using traditional opportunistic caching mechanisms enhanced with a lightweight content discovery approach. Particularly, a content retrieved through an inter-AS link is cached only once along the intra-AS delivery path to maximize network storage utilization, and ephemeral forwarding state to locate temporarily stored content is established opportunistically at each node along that path during the processing of Data packets. The ephemeral forwarding state either points to the arriving or the destination face of the Data packet depending on whether the content has already been cached along the path or not. The challenge in such an approach is to appropriately use and maintain the ephemeral forwarding state to minimize inter-AS content retrieval, while keeping retrieval latency and overhead at acceptable levels. We propose several forwarding strategies to use and manage ephemeral state and evaluate our mechanism using an ISP topology for various system parameters. Our results indicate that our opportunistic content discovery mechanism can achieve near-optimal performance and significantly reduce inter-AS traffic.