Automatically switched multilayer IP-over-optical networks offer extensive flexibility in coping with offered traffic. Multilayer traffic engineering (MLTE) takes advantage of this through online IP logical topology reconfiguration in addition to the more traditional rerouting. Although MLTE typically optimizes towards resource usage, bandwidth throughput and QoS performance, energy efficiency has become an equally important objective recently. In this paper, we examine two types of power reduction techniques and their interaction with the MLTE scheme: simple down-scaling of equipment power requirements, or more radical equipment architecture innovations which concentrate on reducing idle energy consumption. We show that both techniques require a different MLTE approach, and compare total power requirements for both scenarios.

Power reduction techniques in multilayer traffic engineering

High availability is a key requirement of modern complex multilayer communication networks. This tutorial will explain the concepts of recovery mechanisms used in today's multilayer networks where a.o. IP, MPLS and optical technologies are combined.

/pdf/recovery-in-multilayer-optical-networks-2rrnljnxz7.pdf

Recovery in multilayer optical networks

IP-based backbone networks are gradually moving towards a network model consisting of high-speed routers that are flexibly interconnected by lightpaths set up by an optical transport network consisting of WDM links and optical cross-connects. Recovery mechanisms at both network layers are crucial to reach the high availability requirements of critical services. In such a model, the GMPLS protocol suite can provide a distributed control plane that can be used to deliver rapid and dynamic circuit provisioning of end-to-end optical lightpaths. This article explains that it can be very beneficial to exploit this functionality to enhance the cost effectiveness of multilayer recovery significantly. Several practical case studies illustrate this concept and highlight the opportunities and challenges to be faced.

/pdf/benefits-of-gmpls-for-multilayer-recovery-2wdo3gjjo4.pdf

Benefits of GMPLS for multilayer recovery

Automatically switched multilayer IP-over-optical networks offer extensive flexibility in adapting the network to offered IP/MPLS traffic Multilayer traffic engineering (MLTE) takes advantage of this through online IP logical topology reconfiguration in addition to the more traditional rerouting The main goal of MLTE is to optimize toward resource usage, bandwidth throughput and QoS performance However, energy efficiency of ICT infrastructure and the network in particular more recently have become an important aspect as well In this article, we will look how MLTE helps in improving network energy efficiency For this we will explain how optimization toward power requirement relates to the traditional resource usage minimization objective, and how power requirement in the network can be modeled for the MLTE algorithm We will discuss two cases where the merit of MLTE for energy efficiency is discussed Firstly, we will examine the interaction of MLTE with hardware-based energy efficiency optimization techniques; for this we look at scaling back power requirements through the use of better chip technology, but also decreasing idle-power requirement only, using improved chip architecture Secondly, as MLTE allows for fast responses to changing traffic, we will see how link switch-off during off-peak hours offers a straightforward option to reduce energy needs

Multilayer traffic engineering for energy efficiency

Multilayer traffic engineering (MLTE) serves to provide cross-layer online network optimization techniques to cope with rapid variations and short-term evolutions in traffic patterns. MLTE extends traffic engineering as it exists in IP/MPLS-based technology toward the multilayer IP/MPLS-over-optical transport network. In addition to the IP/MPLS traffic routing, MLTE exposes much larger adaptation flexibility by building on next-generation automatic switched optical transport networks. These offer fast setup and teardown of end-to-end multi-hop optical connections (lightpaths), which are offered to the IP/MPLS layer as dynamically provisioned capacity. This dynamic nature leads to an IP/MPLS logical topology that can be reconfigured on the fly, and IP/MPLS link capacity that can be up- or downgraded as client traffic demand varies. These MLTE techniques are generally used to increase perceived network performance in terms of throughput or QoS. As such, a MLTE-managed network offers a better than best-effort service. Many types of traditional and novel services are shifting toward IP/MPLS technology. Consequentially, MLTE algorithms and strategies should be conceived with the characteristics of such services in mind. We present a MLTE strategy that can be implemented in a robust and distributed way. This strategy is then taken as the starting point in a study which evaluates its suitability to such services. We show how the strategy can be adapted considering service performance metrics such as end-to-end delay, traffic loss, and routing stability, and how such service optimizations impact general MLTE objectives such as IP/MPLS logical topology mesh size reduction.

Multilayer traffic engineering for multiservice environments

Automatic switched optical networks (ASONs) or intelligent optical networks (IONs) facilitate setting up or tearing down end-to-end lightpaths dynamically. For an IP-over-optical network scenario, multi-layer traffic engineering (MTE) allows this optical flexibility to be used to reconfigure the logical IP topology in order to cope with changing traffic demands. Utilising an overlay model limits the information exchange between both layers. However, we show that by incorporating even simple optical cost metrics in the MTE process, we can attain significant cost savings in the optical layer, compared to the case where no information (beyond reachability) is communicated - and this with minimal impact on IP layer performance.

http://opti.tmit.bme.hu/~cinkler/TMP/MYPUBwithcitations/pdf/C_200402_ONDM_FairnessGroom_f.pdf

Optical cost metrics in multi-layer traffic engineering for IP-over-optical networks

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Optical cost metrics in multi-layer traffic engineering for IP-over-optical networks