自动交换光网络的GMPLS实现及应用

介绍了自动交换光网络(ASON)与通用多协议标记交换(GMPLS)之间的关系,分析了GMPLS的层次结构模型,针对实际应用介绍了信令、路由和链路管理等协议,并在此基础上给出利用GMPLS实现ASON控制平面的一般方法和标记交换路径(LSP)创建过程,最后阐述了ASON的应用及存在的问题。     

GMPLS与自动交换光网络

GMPLS(通用多协议标签交换)是MPLS技术向光网络发展的产物。它有效地实现了IP和WDM光网络的无缝融合，很好的满足了自动交换光网络控制面的需要。本文主要研究了GMPLS的接口类型和标签、自动交换光网络(ASON)的控制面以及GMPLS在ASON中的应用。     

ASON控制平面和链路管理协议

随着网络容量的不断扩大,提高核心网络效率和动态分配网络带宽的需求越来越迫切。智能光网络是未来光网络的发展方向,控制平面是实现智能光网络的核心。自动交换光网络(ASON )引入了通用多协议标签交换( GMPLS )控制平面,其中链路管理协议是为管理流量工程链路(TE link)开发的新技术。文中介绍了 ASON 中 GMPLS 控制平面及其主要功能,在此基础上对其中链路管理协议的 4 种基本功能(控制信道管理、链路属性关联、链路连通性验证及故障管理)进行具体分析。     

GMPLS在自动交换光网络控制平面中的应用

自动交换光网络（ASON）由于引入了控制平面才成为智能的光网络，而控制平面的具体实现要依靠通用多协议标记交换（GMPLS）协议。首先讨论ASON中的控制平面，然后对GMPLS和MPLS进行比较；最后对GMPLS在ASON控制平面中的应用进行了具体分析。     

基于GMPLS的自动交换光网络智能OXC设计

自动交换光网络(ASON)是一种能够自动完成网络连接的新型网络;GMPLS(通用多协议标签交换)是IETF提出的可用于光层的一种通用多协议标签交换技术,是由MPLS扩展而来的。本文主要是从软硬件方面设计了一个基于GMPLS的满足自动交换光网络控制面要求的智能OXC节点,并探讨了仿真方案,通过仿真可以验证它的功能。     

下一代光传送网:自动交换光网络

为适应网络动态化的要求,国际电信联盟标准化组织(ITU-T)提出了自动交换光网络(ASON)的概念.文章对ASON的网络总体结构、控制层面组成、控制协议及其与广义多协议标签交换(GMPLS)结构的关系作了概要的描述,并对ASON和光互联网进行了比较.     

ASON中OXC的功能设计与研究

在基于ASON(自动交换光网络/)GMPLS(通用多协议标签交换)的分布控制的控制机制下,从软件方面设计了一个智能OXC(光交叉连接)节点,实现在光层上对故障的动态恢复。     

ASON和GMPLS协议的发展

自动交换光网络(ASON)和通用多协议标签交换(GMPLS)相关的协议有了很大的发展,但还不成熟,各厂商存在对同一个协议实现不一致的情况,给多厂商网络和设备的互操作和运营商ASON网络的建设造成一定困难。总结了ASON和GMPLS协议标准化发展的整个过程,对相关标准和草案进行了列表分析。并介绍了我国对ASON进行的标准化工作和我国A-SON标准的特点。     

基于GMPLS控制平面的ASON组播

阐述了利用自动交换光网络(ASON)实现组播的意义,分析了ASON组播的GMPLS信令协议、路由协议,给出了通过改进ASON现有技术实现组播的可行方案,包括信令过程和路由算法,得出结论并对ASON组播的前景作出展望。     

基于GMPLS的自动交换光网络智能OXC设计

自动交换光网络(ASON)是一种能够自动完成网络连接的新型网络；GMPLS(通用多协议标签交换)是IETF提出的可用于光层的一种通用多协议标签交换技术，是由MPIS扩展而来的。本主要是从软硬件方面设计了一个基于GMPIS的满足自动交换光网络控制面要求的智能OXC节点，并探讨了仿真方案，通过仿真可以验证它的功能。     

基于GMPLS的ASON生存性技术研究

自动交换光网络（ASON）是一种能够自动完成网络连接的新型网络。控制面技术是其核心,一些协议（如GMPLS）正在逐步应用到ASON控制面中。网络生存性是指网络发生故障时提供连续业务的能力。基于GMPLS的网络生存性技术对于网络的运营具有重要的意义。本文介绍了光网络的生存性技术并结合GMPLS与ASON控制平面对光网络的生存性进行了较为深入的研究。     

Recovery of the control plane after failures in ASON/GMPLS networks

A reliable control plane plays a crucial role in creating high-level services in the next-generation transport network based on the generalized multiprotocol label switching (GMPLS) or automatically switched optical networks (ASON) model. Approaches to control-plane survivability, based on protection, and restoration mechanisms, are examined. Procedures for the control plane state recovery are discussed, including link and node failure recovery.     

ASON and GMPLS—Overview and Comparison

In automatic switched transport networks (ASTN), transport services of different granularity can be set up, modified and released on demand using the mechanisms in the control plane. Currently, this novel provisioning paradigm is being standardized under the umbrella of the automatic switched optical network (ASON) and generalized multiprotocol label switching (GMPLS) framework. This paper provides an overview of the ASON and GMPLS frameworks at the current stage of their development and aims in particular on comparing the concepts and pointing out some open issues. In this context, we first give a brief overview of ASON and GMPLS work, and then provide a concept and functionality mapping including network resource models, control plane architecture, discovery, call and control management, and resiliency. Finally we address some important provider requirements.     

GMPLS and ASON for automatic switched transport networks

In automatic switched transport networks (ASTN), transport services of different granularity can be set up, modified and released on demand, using mechanisms in the control plane. Currently, this novel provisioning paradigm is being standardized under the umbrella of the automatic switched optical network (ASON) and the generalized multiprotocol label switching (GMPLS) framework. This paper gives an overview of the concepts and open issues of ASON and GMPLS at the current stage of their development.     

PNNI-based control plane for automatically switched optical networks

Much effort has been spent on the definition of control plane protocols for automatically switched optical networks (ASON). Most of the proposals brought into the standardization for an International Telecommunications Union-Telecommunication Sector, Internet Engineering Task Force, and Optical Internetworking Forum are based on Internet protocol concepts. One such proposal is the generalized multi-protocol label switching (GMPLS), an extension of the MPLS traffic engineering control plane model that includes nonpacket switched technologies (time, wavelength, and fiber switching). Recently, the potential use of private network-network interface (PNNI) in ASONs has been discussed as an alternative proposal by the standardization bodies. The goal of this paper is to appropriately adapt asynchronous transfer mode into an optical PNNI (O-PNNI) protocol that can be used as the control plane of ASONs. The paper also provides a critical viewpoint on the potential usage of either O-PNNI or GMPLS control plane and analyzes the pros and cons of each. The methodology adopted toward devising O-PNNI hinges on reviewing PNNI along with ASON recommendations in order to determine the set of PNNI features that require adaptation. Having identified these features we engineer and present appropriate solutions relating to routing, signaling and addressing aspects.     

Waveband grooming and IP aggregation in optical networks

An automatically switched optical network (ASON) can be used as the transport layer of generalized multiprotocol label switching (GMPLS) networks. The design of an ASON involves determining the number of optical cross-connects (OXC) in the network, the required number of ports per OXC, and the interconnection topology of the OXCs. Given the number of ports per OXC, we present a linear algorithm to find the number of OXCs and to identify a cost-effective topology. We then develop a scheme that can be used to perform waveband grooming for several different topologies of an ASON that uses single-layer multigranular OXCs. We identify the bottlenecks and investigate the effect of traffic grooming schemes in the design of an ASON as a function of the peak access rate per customer. We evaluate the topologies and architectures for a national trunk network.     

扩展RSVP-TE的路由排除策略

在实际应用中，以IP网为基础的通用多协议标签交换（GMPLS）控制平面的可靠性尚不能满足自动交换光网络（ASON）电信级的要求，针对这一情况，文章主要探讨了GMPLS信令RSVP-TE的扩展，为建立保护光通道实现路由排除功能，对排除路由对象（XRO，Exclude Route Object）和显示排除路由对象（EXRS，Explicit Exclude Route Subobject）两个对象进行了扩展。     

基于GMPLS的ASON网络故障恢复研究

区别于传统光网络,ASON引入了控制平面进行网络管理控制。控制平面的引入提供了多种生存性方式,可以进行快速的故障恢复。主要研究了基于通用多标签协议（GMPLS）的ASON控制平面的网络恢复机制,分析了常用的恢复和保护策略。以恢复时间作为性能指标,对传统恢复方案和改进的恢复方案进行了分析,并对其网络恢复时间进行了仿真对比,指出各自的优缺点,提出了未来ASON网络中生存性的发展趋势。