Abstract-Management operations performed by Content Delivery Network (CDN) providers consist mainly in controlling the placement of contents at different storage locations and deciding where to serve client requests from. Configuration decisions are usually taken by using only limited information about the carrier networks, and this can adversely affect network usage. In this work we propose an approach by which ISPs can have more control over their resources. This involves the deployment of caching points within their network, which can allow them to implement their own content placement strategies. The work presented in this paper investigates lightweight strategies that can be used by the ISPs to manage the placement of contents in the various network caching locations according to user demand characteristics. The proposed strategies differ in terms of the volume and nature of the information required to determine the new caching configurations. We evaluate the performance of the proposed strategies, in terms of network resource utilization, based on a wide range of user demand profiles and we compare the obtained performance according to metrics we define to characterize the demand. The results demonstrate that the proposed metrics can provide useful indications regarding the performance one strategy can achieve over another and, as such, can be used by the ISP to improve the utilization of network resources. Content Delivery Networks (CDNs) have been the prevalent method for the efficient delivery of rich content across the Internet. In order to meet the growing demand for content, CDN providers deploy massively distributed storage infrastructures that host content copies of contracting content providers and maintain business relationships with ISPs. Surrogate servers are strategically placed and connected to ISP network edges [1] so that content can be closer to clients, thus reducing both access latency and the consumption of network bandwidth for content delivery. Current content delivery services operated by large CDN providers like Akamai [2] and Limelight [3] can exert enormous strain on ISP networks [4] . This is mainly attributed to the fact that CDN providers control both the placement of content in surrogate servers spanning different geographic locations, as well as the decision on where to serve client requests from (i.e. server selection) [5] . These decisions are taken without knowledge of the precise network topology and state in terms of traffic load and may result in network performance degradation. In this work we propose a cache management approach with which ISPs can have more control over their network resources. Exploiting the decreasing cost of storage modules, our approach involves operating a limited capacity CDN service within ISP
More recently, the approach presented in REF has proposed the operation of a limited capacity CDN service within ISP networks by deploying caches at the network edges.
More control over network resources: An ISP caching perspective
Proceedings of the 9th International Conference on Network and Service Management (CNSM 2013)
Proceedings of the 9th International Conference on Network and Service Management (CNSM 2013)
Computer Science