Policy Traffic Switch Clusters: Overcoming Routing Asymmetry and Achieving Scale
A Sandvine Technology Showcase
To be a viable solution in modern communications networks, stateful packet-processing equipment must overcome the challenges posed by routing asymmetry and immense scale.
Routing asymmetry increases network efficiency and redundancy, but also presents serious challenges that must be overcome so that CSPs can implement critical use cases such as accurate charging, policy-based measurements, and congestion management.
The rapidly increasing volume of Internet traffic worldwide also presents issues of efficiency, extensibility, and redundancy.
A cluster of Policy Traffic Switch units emulates the behavior of a single enormous network policy control box in order to overcome asymmetry, deliver extreme scale, and preserve redundancy; importantly, clustering achieves these goals with incredible efficiency. The PTS architecture (at a per unit level and at a cluster level) is ‘shared nothing’, which ensures linear extensibility and enables economical N:N+1 redundancy.
Importantly, a PTS cluster is managed as a single unit, so there is no added operational management complexity, and does not introduce any meaningful latency.
Critically, PTS clustering overcomes asymmetry and delivers scale in any access network, with any combination of access technologies, and completely independent of the network’s routing.
PTS clustering is a beautiful, elegant, and – above all – effective and efficient solution to the challenges imposed by routing asymmetry and the demands of massive scale.