Yiming Yu

Field demonstration of multi-domain software-defined transport networking with multi-controller collaboration for data center interconnection [Invited]

Software-defined networking (SDN) with optical transport techniques enables network operators and data center (DC) operators to provide their resources dynamically on users demands while minimizing operating and capital expenditure. Current multi-domain networking techniques mainly rely on the path-computing element, while SDN has shown considerable potential for this inevitable issue. The first field demonstration of multi-domain software-defined transport networking (SDTN) without global topology information is detailed in this paper. A multi-controller collaboration framework and three schemes, a controller-driven scheme (ConDS), a cloud-driven scheme (ClDS), and a ClDS with dynamic optimization (ClDS-DO), for datacenter interconnection based on SDTN are demonstrated via field networks. We also extend the OpenFlow protocol and design the Java-Script Object Notation application programming interface to support this framework. Multi-domain lightpaths are automatically provided with limited signaling latency. The blocking performances of the proposed schemes are estimated, and the ClDS-DO has the best performance approaching the optimal boundary.

Novel control plane framework and protocol extensions for Spectrum-Efficient Optical Transport Networks

Abstract Spectrum-Efficient Optical Transport Networks (SE-OTN), the most important character of which is high spectrum efficiency due to flexible grid, have attracted much attention recently. However, it cannot be employed for practical use since most of the related protocols are immature. This paper mainly focuses on the framework and protocol extensions for the control plane of SE-OTN. A novel control plane framework is designed combining the advantages of Generalized Multi-Protocol Label Switching (GMPLS) and Path Computation Element (PCE), and several routing and spectrum assignment (RSA) models are built. Furthermore, motivation and extension solutions for Open Shortest Path First-Traffic Engineering (OSPF-TE), Resource ReSerVation Protocol-Traffic Engineering (RSVP-TE), and PCE Protocol (PCEP) are proposed based on this framework. An experimental testbed of large-scale spectrum-efficient optical networks with the capability of supporting 1000 GMPLS-based control nodes has been built to validate the performance of the protocols and algorithms, and some numeric results and analysis are given finally. Numeric results show that our proposed Centralized Routing and Centralized Spectrum Assignment (CR+CSA) model has better performance than Centralized Routing and Distributed Spectrum Assignment (CR+DSA) and Distributed Routing and Distributed Spectrum Assignment (DR+DSA), and spectrum defragmentation algorithm based on spectrum compactness can get good performance in the CR+CSA model.

Experimental demonstration of remote centralized control platform with cloud service in software defined optical network

In this paper, compared with the previous works about software defined network (SDN), software defined optical network (SDON) has the advantages of less delay and higher transmission rate. Using extended OpenFlow protocol (OFP), we develop a network management (NM) system match the centralized control mechanism and propose a remote centralized control platform with cloud service in SDON. Among the experiment optical nodes, there are two flexible ROADMs for supporting flex-grid. The datacenter (DC) resources of cloud service is provided by a commercial DC far away from lab. While the usage of CPU and memory is monitored by deploying program in the DCs server, we can learn the condition of remote DC dynamic. As we know, cloud service mainly include cloud computing and cloud storage, this make remote centralized control platform distribute the cloud resource more reasonable when a service is request. The whole experimental network is made up of control layer and transmit layer, and the demonstration is mainly operated by user in NM interface.

Network function virtualization enabled optical transport node toward future optical networks

A novel optical transport node architecture enabling network function virtualization is proposed with the corresponding control plane framework. The proposed node architecture is emulated by commercial equipment and is validated by the experimental results.

First Field Demonstration of Network Function Virtualization via Dynamic Optical Networks with OpenContrail and Enhanced NOX Orchestration

An overlay network function virtualization framework that utilizes dynamic optical substrate as the underlay network is demonstrated via field networks. On-demand bandwidth provisioning is allowed by the combination of OpenContrail and enhanced NOX.

Using SDN in centralized data centers in power communication networks for disaster recovery

We proposed a SDN-based networking framework for disaster recovery center in electric power communication networks. Typical tasks such as rapid data migration and fast disaster recovery have been proved efficient and reliable under this framework.

Dynamic virtual network embedding algorithm based on multi-path virtual concatenation in elastic optical network

This paper focuses on the concept of multi-path virtual concatenation as a key enabling technology to support the requirements of spectrum bandwidth of link mapping in the process of virtual network embedding (VNE). A dynamic VNE_MP algorithm for distributed data centers inter-connecting is proposed. Based on the multi-path virtual concatenation mechanisms, a virtual link is split into multiple smaller sub-streams and carried on multiple paths. The object for this algorithm is to maximize the spectrum utilization and request accept ratio under the constraint of different delay constraint between splitting paths.

A service-based schedule scheme in flexi-grid optical network

Currently, service characteristic is rarely considered in service processing for the optical network. In this paper, we introduce a novel service-basedscheme which will buffer and schedule services to optimize the blocking performance of flexi-grid optical network based on Software Defined Network (SDN). This scheme gives sufficient consideration to the diversity of services in SDN network. Besides, new algorithms of service scheduling and adjustment are proposed to improve the network performance. Numerical simulation results demonstrate a lower blocking probability and verify the superiority to the conventional scheme.

Differentiated quality-of-protection provisioning with probabilistic-shared risk link group in survivable flexi-grid optical networks

Abstract. A multilink failures model, i.e., probabilistic-shared risk link group (PSRLG), is adopted to investigate the problem of differentiated quality-of-protection (QoP) provisioning for flexi-grid optical networks. As a metric, service failure probability (SFP) is introduced to exactly examine the feasibility of differentiated QoP schemes, which denotes the failure probability of a connection during transmission. According to different reliability requirements, connection requests are divided into three classes, i.e., class high, class middle, and class low. Then two differentiated QoP provisioning schemes are proposed based on the class division, i.e., intraclass-shared resource scheme (ICSR scheme) and cross-class-shared resource scheme (CCSR scheme). The former allows a connection to share backup resources only with those connections in the same class, whereas the latter enables the connections in different classes to share backup resources. Simulation results show that our proposed schemes could well provide differentiated reliability with PSRLG constraint and achieve a good balance between reliability and resource efficiency. Moreover, the CCSR scheme achieves lower blocking probability, lower resource redundancy, and higher spectrum utilization without sacrificing reliability compared to the ICSR scheme.