CoMon: An architecture for coordinated caching and cache-aware routing in CCN

Abstract

The autonomous cache management in Content-Centric Networking (CCN) results in suboptimal caching decisions and implies cache-ignorant routing. Cache coordination and similar improvements hence have been the subject of several recent studies. The proposed solutions, however, are either impractical due to their massive coordination overhead, or of limited benefit since they cannot realize perfect coordination. We present CoMon, an architecture for network-wide coordinated caching. CoMon realizes an affordable, yet highly effective, coordination by assigning monitoring and cache-aware (re)routing tasks to only a few nodes, through which the majority of traffic is expected or enforced to pass. CoMon, by design, maximizes the diversity of cached contents and reduces cache replacements. In addition, our simulation study using ISP topologies, shows that CoMon under several scenarios, when coordinates through a small ratio of the nodes, reduces the server hit ratio (i.e. the ratio of requests consumed by the origin content providers) of both CCN and notable related work, remarkably.