虚拟化云交换中心的探索与实践

文章介绍了云交换中心(CXP,Cloud Exchange Point)业务需求,探讨我国新型互联网交换中心部署多云交换场景的可行性,并具体介绍了虚拟化云交换中心的设计思路和测试实践,使企业能够实时开通上云或多云互联业务,基于高速通道让网络时延优化近30%,让企业上云更容易、更快、更稳定。     

国家级新型互联网交换中心规划路径研究

<正>当前,互联网信息接入数量呈现快速上升的趋势,互联网交换中心作为信息通信中的“新基建”,逐步成为全球网间互联的关键基础设施,是国际互联网架构的重要组成部分。因其具有“一点接入、多点联通”的特点,互联网交换中心为企业提供了高效的互联互通环境,降低了网络互联的复杂度和难度。根据国际上成熟的行业模式,互联网交换中心以接入企业占用交换平台的端口为基础收费依据,使互联网企业节省接入成本,推动了互联网企业加强自身网络改造。     

华为靳玉志详解Mesh化骨干网方案助运营商迎接网络全面云化

随着互联网以及云业务的快速发展,未来几年,DC(数据中心)间的流量增长速度超过50％.DC之间的流量成为骨干网的主要流量,这个变化导致传统电信业务基于行政区化的建网模式,必须转向以DC为中心重构骨干网.新的网络需要实现大部分网络节点之间的Mesh互联,业务一跳直达,尽量降低业务经过的网络节点时延,以保证DC间数据的实时交换,满足未来云业务的高实时性要求.     

国家级新型互联网交换中心建设应用研究

国家级新型互联网交换中心是工信部设立的国家级网络基础设施,旨在优化我国网间互联顶层架构,实现跨主体、跨区域、跨层级的扁平化网络互联互通。通过对建设背景、特点和发展现状的分析,结合已建设的经验,研究提出区域内建设新型交换中心的最优定位和建设运维方案,并探讨了其对运营商的影响与机遇。     

SDN技术在混合云网络架构中的应用研究

混合云在企业自有IT的基础上,构建与云端网络互联的混合IT基础架构。对运营商来讲,为企业提供混合云需要解决多租户网络虚拟化的问题,并提供虚拟网络间的弹性互联。分析了基于SDN技术实现混合云的2种主要方式,描述了每种方式的技术原理及架构。对2种方式的优缺点进行了比较。     

混合云中网络虚拟化架构的性能优化研究

混合云是在企业自有IT基础上构建与云端网络互联的混合IT基础架构。对运营商来讲,为企业提供混合云需要解决多租户网络虚拟化的问题,并提供虚拟网络间的弹性互联。文章介绍混合云的网络虚拟化架构,提出虚拟化组件的性能优化方法以及虚拟化网络的动态可扩展设计,为运营商运营混合云服务提供理论指导和实践支持。     

基于深度置信网络的互联网流量预测方法

随着我国互联网数据的飞速发展,数据流量已经出现一定的增长趋势,但随之也给电信网络企业带来巨大的压力,尤其是目前互联网通信的大部分流量源仍然是数据流量。对于当前人们对于互联网的需求逐渐增加,如何将更多流量迁移到TD网络,实现网络的有效承载是一个关键问题,也是当前需要解决的问题。基于此,本文主要运用深度置信网络的方式进行分析,通过对互联网流量数据进行相应的预测,能够有效介绍基于深度置信网络的结构,然后构建不同网络架构下的深度置信网络结构。     

WAP网关应对移动互联网大流量的改造及演进

通过分析WAP网关由于移动互联网大流量带来的问题,提出了对网关实施业务分流、网络架构云化改造、系统功能完善的改造措施,并建议下一步向综合流量网关演进。     

中国联通走近云时代——走进云计算还需未雨绸缪

据了解，中国联通IDC中心今年下半年已经着手开始建立“互联云”项目，并计划按照全球云、云联云、互联云的架构进行云计算的工程建设。此项工程也促使中国联通一步一步走近云时代。     

业务体验驱动的时间敏感网络架构研究

论述了时间敏感网络的管控架构,阐述了业务体验驱动网络的理论体系,对产业互联网场景业务模型及流量模型的特点进行了分析,并且提出了以业务体验驱动时间敏感网络的系统架构及运行机制。     

High-capacity multiservice optical label switching for the next-generation Internet

This article presents an optical label switching technology geared toward the next-generation Internet, and highlights its promising potential to accommodate packet, burst, and circuit traffic in a unified optical layer. In particular, we provide detailed discussions on an architecture design for a high capacity optical label switching router by considering enabling optical technologies. In pursuit of an effective contention resolution scheme, we investigate an end-to-end solution by incorporating a traffic shaping function at the network edge with wavelength, time, and space dimensions contention resolution in the core network. Experimental results indicate that this scheme is capable of achieving very low packet loss rates. Furthermore, due to its natural compatibility with GMPLS architecture, optical label switching has great potential for a seamless upgrade of today's optical networks toward the next generation Internet.     

Packet-aware transport for metro networks

Today's metro networks have evolved from the need to support traditional voice and private line services. However, the tremendous growth in access to frame relay, ATM, IP, and Ethernet services, coupled with the desire of enterprise customers to interconnect via Ethernet interfaces, suggests the need for a new approach. This article proposes a new architecture for packet-aware transport networks (PATN) that supports both packet and traditional TDM services and leverages an assemblage of emerging technologies to provide efficient aggregation and switching of packet traffic in metro networks. The PATN has the potential to provide significant cost savings to carriers by reducing the number of network elements, reducing transport costs through statistical multiplexing, and eliminating the need for redundant multiplexing operations.     

MPLS and the evolving Internet architecture

The Internet architecture has evolved over time, adapting to the needs of its users and incorporating new technology as it has been developed. The introduction of multiprotocol label switching (MPLS) as a part of the Internet forwarding architecture has immediate applications in traffic engineering and virtual private networks. In the longer term, MPLS may affect how traffic transits the Internet and the services that the Internet delivers     

智融标识网络基础研究

现有互联网因其原始设计不足已在服务质量、资源利用率、管控能力等诸多方面暴露出严重弊端，难以支撑起"互联网+"新业态高速发展对通信网络与服务日趋复杂化、多元化的需求.因此，如何设计全新的互联网已成为信息领域最为迫切与核心的研究内容之一，受到学术界与产业界的高度重视.本文基于前期"标识网络"与"智慧标识网络"研究，创造性提出"智融标识网络"体系及其关键机制，通过全网多空间、多维度资源的智慧融合，实现个性化服务的按需供给与灵活化组网的有效支撑，为不同行业与用户提供高效的差异化、定制化通信网络服务，以普遍适用于高铁网络、工业互联网、车联网等各类迥异应用情景.     

A vertical Path Computation Element (PCE) based path provisioning scheme in multilayer optical networks

The explosive growth of Internet traffic has led to a dramatic increase in demand for data transmission capacity, which requires high transmission rates beyond the conventional transmission capability. This demand has spurred tremendous research activities in new high-speed transmission and switching technologies. As optical transmission technology keeps maturing, next generation optical networks are expected to be controlled by Generalized Multiprotocol Label Switching (GMPLS) protocol suite and operating at multiple switching layers. In order to ensure the most efficient utilization of multilayer network resources, and to maximize revenue from existing capacity, effective global provisioning solution that providing the network with the possibility of reacting in advance to traffic changes should be provided. This paper proposes a new path provisioning scheme in multilayer optical networks based on the vertical Path Computation Element (PCE) architecture to efficiently exploit multiple PCE cooperation. This paper also investigated the problem of how network nodes overcome limited visibility of network resources. Unlike most of the previous studies, the topology of the upper switching layer is not always equal to the physical topology of lower switching layer.     

基于SDN的互联网域间路由研究

互联网流量的爆发式增长,叠加互联网流量固有的突发性特点,使得网络流量不均衡现象日益加剧。传统BGP协议由于缺乏全网拓扑和全局流量观,只能遵循标准BGP选路原则,在解决流量调度和负载均衡方面存在不足。针对BGP协议存在的局限性,研发了基于RR+的互联网骨干网流量调度系统,并应用于ChinaNet骨干网的网内中继、网间互联出口、IDC出口等多个流量优化场景。更进一步地,提出了一种基于SDN的互联网域间路由架构,通过在域间控制器之间交换BGP路由,无需在域内和域间运行BGP协议,极大地简化了网络协议,并能够实现灵活的流量调度和负载均衡。     

QoS issues in the converged 3G wireless and wired networks

The Internet evolution delineated through the last years has urged the wireless network community to support the deployment of IP multimedia services with guaranteed quality of service (QoS) in 3G wireless networks. This article copes with the interoperability between 3G wireless networks and wired next-generation IP networks, for the provision of services with an a priori known quality level over both environments. More specifically, the UMTS architecture as well as a prototypical implementation of the next-generation Internet based on DiffServ are considered. The article focuses on the mapping among the traffic classes of the two networks at the point where the networks converge, and discusses the requirements and possible solutions for their proper interworking at the signaling and user levels. Simulations prove that proper mapping among the traffic classes of each world is necessary in order to achieve the desired end-to-end traffic characteristics.     

Traffic engineering standards in IP-networks using MPLS

The explosive growth of the Internet over the last few years has made the IP protocol suite the most predominant networking technology. Furthermore, the convergence of voice and data communications over a single network infrastructure is expected to happen over IP-based networks. Traditional IP-networks offer little predictability of service, which is often unacceptable for applications such as telephony, as well as for emerging and future real-time applications such as telemedicine. One of the primary goals of traffic engineering is to enable networks to offer predictable performance. Due to the need for better traffic control by network service providers, there has been considerable activity in the Internet Engineering Task Force to develop standards for traffic engineering in IP-based networks. This article discusses the direction taken by the IETF and some of the recent standardization efforts for traffic engineering using multiprotocol label switching (MPLS). Our primary focus is on the signaling protocols developed for this purpose     

Strictly Nonblocking $f$-Cast Photonic Networks

The multicast capability and crosstalk issue need to be deliberately considered in the design of future high performance photonic switching networks. In this paper, we focus on the photonic switching networks built on the banyan-based architecture and directional coupler technology. We explore the capability of these networks to support general f-cast traffic, which covers the unicast traffic (f = 1) and multicast traffic (f = N) as special cases, and determine the conditions for these networks to be f-cast strictly nonblocking under various crosstalk constraints. In particular, we propose an optimization framework to determine the nonblocking condition of an f-cast photonic network when a general crosstalk constraint is imposed.     

Traffic engineering in a multipoint-to-point network

The need to guarantee quality-of-service (QoS) to multimedia applications leads to a tight integration between the routing and forwarding functions in the Internet. multiprotocol label switching tries to provide a global solution for this integration. In this context, multipoint-to-point (m2p) networks appear as a key architecture since they provide a cheaper way to connect edge nodes than point-to-point connections. M2p networks have been mainly studied for their load balancing ability. In this paper, we go a step further: we propose and evaluate a traffic management scheme that provides deterministic QoS guarantees for multimedia sources in an m2p network. We first derive an accurate upper bound on the end-to-end delay in an m2p architecture based on the concept of additivity. Broadly speaking, an m2p network is additive if the maximum end-to-end delay is equal to the sum of local maximum delays. We then introduce two admission control algorithms for additive networks: a centralized algorithm and a distributed algorithm and discuss their complexity and their scalability