Introduction

The STRAUSS project addresses the call key targets by proposing and defining a highly efficient (notably in terms of cost and energy) and global (by considering an end-to-end approach in a multi-domain setting) optical infrastructure for Ethernet transport. In particular, the STRAUSS project focuses on the integration and development of the following technologies:

  • Cost/energy efficient and extremely fast-performing switching nodes based on variable-capacity and fixed-length optical packet switching technology for access and aggregation networks.
  • Flexi-grid DWDM optical circuit switching nodes and transmission systems for long haul transport, such as highly integrated and scalable software defined optical transceivers supporting bandwidth variable multi-flows for flexible Ethernet transmission.
  • A virtualization layer for dynamic and on-demand partitioning of the optical infrastructure, offering virtual optical Ethernet transport networks, referred to as slices.
  • Control plane approaches based on either legacy (e.g. GMPLS) and new (e.g. OpenFlow based) protocols for the control and management of virtual slices.
  • A service and network orchestration layer for the interworking and coordination of heterogeneous control plane and transport technologies to offer end-to-end Ethernet transport services.


The vision will be fulfilled by the planned demonstrations on testbeds in EU & Japan, using and extending
the available testbeds, infrastructures and know-how developed by the consortium partners.

 

Overall architecture

STRAUSS proposes a future software defined optical Ethernet transport network architecture, composed of four layers: the transport network infrastructure layer, the transport network virtualization layer, the virtual infrastructure control and management, and an end-to-end service & network orchestration layer.

  • A flexi-grid optical path-packet transport network infrastructure. The underlying physical infrastructure covers different/heterogeneous technologies based on: i) optical packet switching technology to provide scalable and cost/energy-efficient traffic grooming at sub-wavelength granularity, ii) optical spectrum switching technology to provide flexible spectrum management capabilities, and iii) software-defined and sliceable (multi-flow) bandwidth-variable transponders (BVT) supporting multiple data flows with different modulation formats and bit rates.
  • A transport network virtualization layer which, based on the abstracted infrastructure information, virtualizes the heterogeneous data plane resources. The physical infrastructure is partitioned and/or aggregated into virtual resources (i.e. virtual nodes and links), and virtual resources from different domains are selected to compose end-to-end virtual transport infrastructures. The characteristics of optical transmission and networking technologies (i.e. the inherent analogue nature, optical layer constraints and impairments) will be taken into account when composing the virtual infrastructures over multiple technology domains. Each virtual infrastructure can be controlled and managed individually.
  • A Virtual Infrastructure control and management plane, employing GMPLS and/or customized network control based on OpenFlow sits over each virtual transport infrastructure, providing control and management functionalities.
  • A Service and network orchestration layer, on top, using SDN-based service and network orchestrator(s) and responsible for the interworking of different control plane paradigms in order to provide end-to-end Ethernet services.

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