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Segment Routing (SR) has been recently introduced to enable efficient traffic engineering while simplifying control plane operations. Thanks to the source routing paradigm, traffic flows can be dynamically routed along the network, effectively exploiting network resources. In this paper, dynamic SR operations for multi-layer networking are presented and experimentally demonstrated. In particular,...
Multi-layer resilience is one of the prominent new concepts for modern carrier networks; it efficiently combines the advantages of the optical and the packet layer. However, not all features offered by modern optical transport networks can be fully used by the packet layer yet. In case of a fiber cut, an optical protection mechanism restores the original IP topology after a short transient time. But...
Segment Routing enabling dynamic optical bypass in a multi-layer network is experimentally demonstrated. Edge nodes are efficiently configured by an enhanced SDN controller, showing effective scalability performance under different label stacking conditions.
The currently standardized GMPLS protocol suite for packet over optical networks relies on hierarchical instances of signaling sessions. Such sessions have to be established and maintained also in transit nodes, leading to complex and weighty control plane implementations. A novel technology called Segment Routing (SR) has been recently proposed to address these issues. SR relies on the source routing...
IP/MPLS based ASON/GMPLS networks enable the interaction between the IP layer and the optical WDM layer. Furthermore, it decouples the physical topology from the dynamically created IP topology, which is called Virtual Topology. In this network architecture, there are two known routing policies, they are the Physical Topology First (PTF) and Virtual Topology First (VTF). PTF and VTF are different...
Dense Wavelength Division Multiplexing (DWDM) has emerged as the premiere transport technology and has gained much traction in long-haul and metro/regional networks, while most of the Internet services have been converged on the Internet Protocol (IP) layer. This has motivated the expectation that IP over WDM multilayer infrastructure to be the preferred infrastructure for broadband communications...
Bandwidth and Delay are quality parameters that can be guaranteed for new connections that are offered to the network by finding a suitable path in the network. Finding such a suitable path is the task of QoS routing techniques developed for IP Optical networks based on Multiprotocol Label Switching (MPLS). In this paper we focus on dynamic routing of Bandwidth (1Mbps/link) and delay (1ms/link) guaranteed...
As AT&T plans our next generation router networks, our requirements for bandwidth, in addition to scale, include information and decision integration in the L1 and L3 control plane for efficiency, flexibility, reliability and speed. AT&T has one of the world's largest and most powerful IP MPLS backbones. Our network is our brand, so as we look to leverage our network to improve our customer's...
The Internet explosion has drastically increased the bandwidth demand of modern telecommunication networks and as optical networks provide an opportunity for the future Internet, it is expected that Internet providers will gradually replace their infrastructures with optical networks. The Internet is a decentralized set of networks (more than 29.000) known as domains or Autonomous Systems on a well-known...
Optical backbone networks are becoming increasingly intelligent and flexible. These networks are able to establish high-bandwidth wavelength connections on-demand to support future network-centric applications. Choosing an efficient path in a timely manner, while considering important criteria such as operation costs and network performance, is a key problem confronting the network operators. Subtle...
This paper proposes an adapted crankback-enabled post-fault restoration scheme against large-area failure events in multi-domain DWDM optical network. This novel solution provides recovery and resource efficiency without increasing routing overheads.
This paper describes distributed scheduling based on schedule-aware network elements using switched path LSPs whose physical path may vary during service. This technology provides more reliable, more efficient service to better meet user needs.
Hierarchical PCE is evaluated in GMPLS-based multi-domain WSONs. Simulations show that PCE providing edge nodes sequence using detailed information of inter-domain links achieves the best performance guaranteeing a lightweight control plane.
A distributed strategy for selecting the links to be set in sleep mode and re-routing the light-paths is proposed for WDM networks. GMPLS extension for advertising link sleep mode is introduced. Considerable power savings are achieved without affecting the blocking.
This paper presents an optical network with distributed PCE in China, which integrates a PCE network into control and management planes of GMPLS-based ASON.
Since its emergence the internet has been a significant part of today's modern living. Defined by its interconnections and routing policies, it has fuelled increased demands for provisioning of new more advanced services that are able to dynamically react to changes within the network. These services however, lead to enormous energy consumption in contrast to a global drive for a greener environment...
In WDM network, the load balance problem has received much attention in parallel and distributed applications because good solutions are critical to achieving speedups. This paper discusses traffic technology and load balancing in optical networks. In WDM network, enhancing the performance of an operational network, at both the traffic and the resource levels, are major objectives of traffic engineering...
The success of Generalized Multi-protocol Label Switching (GMPLS) provides a solution that enhances IP by its remarkably advanced features particularly the improvement in data transfer rate. GMPLS can be well classified, managed and policed across different types of networks. In this paper, we discuss the GMPLS and its application for core optical network. The IP and optical layers are converging...
Network load balancing is the ability to aggregate two or more wide area network (WAN) connections in order to achieve greater reliability and overall throughput. This paper discusses traffic technology and flow optimization in optical network. Performance optimization of networks is actually a control problem. Traffic engineering should provide sufficient control in an adaptive feedback control system...
The GMPLS distributed control plane is used in wavelength-routed networks to dynamically establish end-to-end lightpaths. During the signaling phase, lightpath requests can be blocked due to lack of available resources or due to resource contentions. Blocking due to resource contentions is the dominant source of blocking, when network is lightly loaded or lightpath requests are highly dynamic. To...
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