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The architecture in a differentiated services (DiffServ) network is based on a simple model that applies a per-class service in the core node of the network. However, because the network behavior is simple, the network structure and provisioning is complicated. If a service provider wants dynamic provisioning or a better bandwidth guarantee, the differentiated services network must use a signaling protocol with QoS parameters or an admission control method. Unfortunately, these methods increase the complexity. To overcome the problems with complexity, we investigated scalable dynamic provisioning for admission control in DiffServ networks. We propose a new scalable qDPM 2 mechanism based on a centralized bandwidth broker and distributed measurement-based admission control and movable boundary bandwidth management to support heterogeneous QoS requirements in DiffServ networks.

We propose and experimentally demonstrate a service‐aware optical transport system. The proposed service‐aware optical transport system makes a flow based on service type and priority of traffic. The generated flow is mapped to a corresponding sub‐λ for transport over an optical network. Using sub‐λ provided by the centralized control plane, we could effectively provide quality‐of‐service guaranteed Ethernet service and best‐effort service simultaneously in a single link. The committed information rate (CIR) traffic and best‐effort traffic are assigned to different sub‐λs. The bandwidth of the CIR traffic is guaranteed without being affected by violation traffic because the bandwidth is managed per each sub‐λ. The failure detection time and restoration time from a link failure is measured to be about 60 µs and 22 ms, respectively, in the ring network. The measured restoration time is much smaller than the 50 ms industry requirement for real‐time services. The fast restoration time allows the proposed service‐aware optical transport system to offer high availability and reliability which is a requirement for transport networks.

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