Optical Network Control and Management

The task of network control and management is generally realized in two logical planes – control and management – which collaboratively operate to ensure smooth, secure, and survivable traffic flow in the data plane of the network. Some of the functionalities are realized in the control plane, needing real-time execution, such as recovery from network failures, and network reconfiguration due to traffic variation. Other functionalities deal with performance monitoring, configuration management, network security, accounting and billing etc., which are less time-sensitive and are addressed by the management plane. We first discuss the philosophy of multiple-layer abstraction of telecommunication networks, including control, management, and data planes, and then describe various network control and management techniques used in optical networks: operation, administration, and management (OAM) in SONET, generalized multiprotocol label switching (GMPLS), automatically switched optical network (ASON), and software-defined optical networking (SDON) in WDM networks. (141 words)

Investigation of Blocking Performance in GMPLS Networks

The call blocking is the most vital factor in generalized multiprotocol label switching (GMPLS) Networks. Call blocking depends upon many factors such as traffic intensity, number of servers and number of links. Call blocking performance for GMPLS networks has been calculated in this paper by using a proposed mathematical model. The proposed model investigates the dependency of probability of call blocking upon the number of wavelengths and number of links. In the suggested model, the blocking performance of GMPLS network is improved.

GMPLS for Future Applications

Generalized Multiprotocol Label Switching, or GMPLS, is a suite of protocols to enable automated resource discovery, automated service provisioning and automated failure recovery. In recent years, a considerable number of efforts have been seen in the area of putting GMPLS into advanced networking/service environments. This is exemplified by the various research programs in the US, Europe, and Asia. In such programs, GMPLS has not only been used as a way to reduce management complexity and increase reliability, like the industry is doing right now, but also it is used as a new way for service provisioning. In this chapter, the authors first review activities in using GMPLS controlled optical networks in high performance computing environments. They try to identify the benefits, as well as the limitations in such networking practices. Then they introduce the past and on-going standardization work in the Internet Engineering Task Force (IETF) about GMPLS network performance characterization and measurement. Finally, the authors present the performance measurement results from a number of deployed GMPLS networks.

Evaluación de los protocolos OSPF-TE y BGP en funciones de autodescubrimiento para L1VPN sobre GMPLS

Las tecnologías GMPLS (Generalized Multiprotocol Label Switching Architecture) conforman un nuevo framework de protocolos, el cual es una versión extendida de MPLS que no solamente realiza las labores MPLS sino que además tiene protocolos especializados para descubrir vecinos, distribuir información de enlace, realizar administración de la topología, realizar administración de rutas, balanceo de cargas, implementar un control centralizado, manejar ancho de banda bajo demanda y así mismo manejar VPNs (Virtual Private Networks) a nivel físico-óptico mediante el uso de los dispositivos ópticos adecuados. En este artículo se evaluan los resultados de una simulación del mecanismo de autodescubrimiento en una VPN de capa uno usando los protocolos OSPF-TE y BGP utilizando como herramienta de simulacion el simulador GLASS(GMPLS Lightwave Agile Switching Simulator). Con esto se pretende dar una visión al lector de todo el potencial de GMPLS como nuevo framework a implementar y, así mismo, realizar un análisis mediante el cual se puedan ver las ventajas y desventajas de utilizar OSPF-TE o BGP como protocolo de autodescubrimiento en una VPN de capa uno para un escenario de red específico.