Request Router

The OneVantage Request Router is a highly available and scalable request routing service. Using enhanced Domain Name System (DNS)-based techniques, it translates host names from end-user requests into IP addresses of edge caches best able to deliver the requested content. Its key features and benefits include:

Scalability and High Availability

With its scale out architecture, Request Router servers can be replicated and distributed throughout the network to assure maximum performance and fault tolerance. The underlying algorithms scale independent of the number of end-users requesting objects and the number of objects being served. Request Router routes requests around site failures as well as individual node failures within an HyperCache cluster

Request Router is especially well suited for support of highly fragmented HTTP Adaptive Streaming video traffic. HTTP-AS works by breaking down large video files into small HTTP-based file downloads encoded at a variety of data rates. Using state-of-the-art DNS techniques, the Request Router scales to support an extremely high number of HTTP small object requests.

Enhanced Operator Control

Request Router selects from among the set of caching nodes according to an operator-defined policy that takes user proximity, network topology, cache load, and hardware capabilities into account. For example, operators can deploy caches with a mix of HDD and SDD storage technologies, and Request Router will intelligently route requests to the most suitable node based on workload. This gives the operator full control over traffic engineering decisions and ensures that all caches in the CDN operate in the most efficient way possible.

Support for Federated CDN

Our approach to request redirection is naturally extensible to a federation of interconnected CDNs. This enables an operator to engage in mutually beneficial peering arrangements, including:

• CDN Termination - a global CDN peers with one or more regional CDNs that terminate content delivery to locally connected end-users
• Pair-wise Peering - two CDNs that want to deliver their local content to each other's end-users
• International CDN - a set of national affiliates cooperating to form a single international CDN
• On-Net/Off-Net Delivery - an operator serving content to end-users directly connected to its network might also serve those same users when they are connected off-network