In conventional networks, service control function and network control function work independently. Therefore, stereotypical services are provided via fixed routes or selected routes in advance. Recently, advanced network services have been provided by assortment of distributed components at low cost. Furthermore, service platform, which unifies componentized network control and service control in order to provide advanced services with flexibility and stability, has attracted attention. In near future, network management system (NMS) is promising, which replies an answer quickly for such advanced service platforms when route setting is requested with some parameters: quality of service (QoS), source and destination addresses, cost (money) and so on. In addition, the NMS is required to provide routes exploiting functions such as path computation element (PCE) actually. This paper proposes scalable network architecture that can quickly reply an answer by pre-computing candidate routes when route setting is requested to a control unit like an Autonomous System (AS). Proposed architecture can manage network resources scalably, and answer the availability of the requested QoS-aware path settings instantaneously for the forthcoming service platform that finds an adequate combination of a server and a route. In the proposed method, hierarchical databases are established to manage the information related to optical network solution and their data are updated at fewer times by discretized states and their boundaries with some margin. Moreover, with multiple and overlapped overlay, it pre-computes multiple candidate routes with different characteristics like available bandwidth and the number of hops, latency, BER (bit error rate), before route set-up request comes. We present simulation results to verify the benefits of our proposed system. Then, we implement its prototype using OpenFlow, and evaluate its effectiveness in the experimental environment.