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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.