The emerging software defined networking (SDN) paradigm separates the data plane from the control plane and centralizes network control in an SDN controller. Applications interact with controllers to implement network services, such as network transport with quality of service. SDN facilitates the virtualization of network functions so that multiple virtual networks can operate over a given installed physical network infrastructure. Due to the specific characteristics of optical (photonic) communication components and the high optical transmission capacities, SDN-based optical networking poses particular challenges, but holds also great potential. In this article, we comprehensively survey studies that examine the SDN paradigm in optical networks; in brief, we survey the area of software defined optical networks (SDONs). We mainly organize the SDON studies into studies focused on the infrastructure layer, the control layer, and the application layer. Moreover, we cover SDON studies focused on network virtualization, as well as SDON studies focused on the orchestration of multilayer and multidomain networking. Based on the survey, we identify open challenges for SDONs and outline future directions.

Software Defined Optical Networks (SDONs): A Comprehensive Survey

The present invention generally relates to communication and controlled sharing of digital content among networked users, and is more particularly concerned with creation of an improved sharing network for relaying data among linked nodal members of a social network. An ad hoc network may be a hybrid P2P network that conforms to a virtual peer representation accessible as a single node from outside the given social network nodes. Members of a pre-existing social network may selectively activate embedded latent peers and link to an aggregation node to form a hybrid P2P network. Content may be shared in a controlled distribution according to level rights among participating network nodes. Playlists and/or specialized user interfaces may also be employed to facilitate content sharing among social network members of a virtual peer.

System and method of sharing content among multiple social network nodes using an aggregation node

A centralized controller provides dynamic end-to-end network path setup across multiple network layers. In particular, the centralized controller manages end-to-end network path setup that provisions a path at both the transport network layer (e.g., optical) and the service network layer (e.g., IP/MPLS). The centralized controller performs path computation for an optical path at the transport network layer and for a path at the service network layer that transports network traffic on the underlying optical transport path, based on information obtained by the centralized controller from the underlying network components at both layers.

Dynamic end-to-end network path setup across multiple network layers

A path control device includes a TE database and a local database for storing topology information showing states of use of links in a network, a topology information collection unit collecting the topology information of the respective communication nodes therefrom and updating the TE database by the topology information, a path solution unit determining a path of the network referring to the local database, an internal update unit recognizing a link included in the determined path and updating a local database by information as to said link, and an update determination unit matching the topology information of both the databases by comparing both the databases.

Network path control system, path control device, and path control method

Resilience-driven restoration model for interdependent infrastructure networks

PROBLEM TO BE SOLVED: To set an optical path in a network including a mixed WSON non-compatible communication device with a WSON compatible communication device, without adding a function to handle a WSON information element to the WSON non-compatible communication deviceSOLUTION: In a network 1, when a path is set from a WSON non-compatible communication device 2A to a WSON non-compatible communication device 2B, the WSON non-compatible communication device 2A transmits a signaling message (without wavelength information), and a WSON compatible communication device 3A adds wavelength information (WSON information element) to the signaling message In a WSON 3000, the signaling message (with wavelength information) is transferred A WSON compatible communication device 3B removes the wavelength information from the signaling message (with wavelength information), and forwards a signaling message (without wavelength information) to the WSON non-compatible communication device 2B

Path setting method and path setting device

PROBLEM TO BE SOLVED: To flexibly utilize shared reserve resources by using not only communication devices in a communication system but also various functional parts as the shared reserve resources.SOLUTION: In a communication system which includes a communication network including a communication group and a control part for monitoring and controlling the communication devices in the communication network, the communication network includes the shared reserve resources to be used as a temporary switching destination of active resources for the unit of a communication device or for the unit of a functional part within the communication device. In the case where a communication device in the communication network or active resources as a functional part in the communication device are not available any more, the control device determines switching destination shared reserve resources as a switching destination of the unavailable active resources and sets a configuration definition corresponding to a configuration definition in the unavailable active resources to the switching destination shared reserve resources such that, on the basis of control by the control device, a signal path between the unavailable active resources and other active resources is switched to a signal path between the switching destination shared reserve resources and the other active resources.SELECTED DRAWING: Figure 6

Communication system, resource switching method, control device, and program

The paper proposes the hierarchical cloud-router network (HCRN) to solve the problem of overcoming the scalability limit in a multi-layer generalized multi-protocol label switching (GMPLS) network. We define a group of nodes as a virtual node, called a cloud-router (CR). A CR consists of some number of nodes or lower-level CRs. A CR is modeled as a multiple switching capability (SC) node when it includes more than one kind of SC, such as fiber SC, lambda SC, time-division multiplexing (TDM) SC, packet SC, even if there are no actual multiple-SC nodes in the CR. The CR advertises its abstracted CR internal structure which is abstracted link state information inside the CR. A large-scale, multi-layer network can then achieve scalability by advertising the CR internal structure throughout the whole network. In this scheme, the ends of a link connecting two CRs are defined as interfaces of the CRs. We adopt the CR internal cost scheme between a CR's interfaces to abstract the network. This CR internal cost is advertised outside the CRs via the interfaces. Our performance evaluation has shown that HCRN can operate a larger number of nodes than a normal GMPLS network. It can also bear more frequent network topology changes than a normal GMPLS network.

http://biblio.yamanaka.ics.keio.ac.jp/file/conf_shimazaki_200312.pdf

Scalable multi-layer GMPLS networks based on hierarchical cloud-routers

Loop-Free IP Fast Rerouting Considering Double-Link Failures

PROBLEM TO BE SOLVED: To prevent the increase of network information caused by the remainder of unnecessary network information in a communication device that performs routing and/or switching data flowing in a network.SOLUTION: A network information management method is provided for a communication device 2 that performs at least routing or switching data flowing in a network. The communication device 2 comprises: a storage 26 for storing information of one or more networks for use for data communication and a deletion condition of the information of each network; and a processor unit. The processor unit determines whether or not the deletion condition corresponding to the information of each network is satisfied, and in regard to the network information satisfying the deletion condition, the processor unit performs either deletion from the storage 26 or notification to an operator.

Daisaku Shimazaki

Papers

Path setting method and path setting device

Communication system, resource switching method, control device, and program

Scalable multi-layer GMPLS networks based on hierarchical cloud-routers

Loop-Free IP Fast Rerouting Considering Double-Link Failures

Method and program for network information management, and communication device