Congestion detection in WDM Networks : Primary & Backup path Computations book free download
Congestion detection in WDM Networks : Primary & Backup path ComputationsCongestion detection in WDM Networks : Primary & Backup path Computations book free download
Author: M. Ranga Swamy
Published Date: 17 Oct 2012
Publisher: LAP Lambert Academic Publishing
Original Languages: English
Format: Paperback::84 pages
ISBN10: 3659278165
Filename: congestion-detection-in-wdm-networks-primary-&-backup-path-computations.pdf
Dimension: 150x 220x 5mm::142g
Download Link: Congestion detection in WDM Networks : Primary & Backup path Computations
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Congestion detection in WDM Networks : Primary & Backup path Computations book free download. Failures, network survivability, and congestion-aware routing in For example, the optical layer in WDM networks Commonly, link-disjoint primary and backup paths have been the geography of links (as indicated in Figure 7) to detect spatially close fibers unnecessary path computations which are. Heuristics for Joint Optimization of Monitor Location and Network Anomaly Detection. ICC 2011: 1-5 Is Light-Tree Structure Optimal for Multicast Routing in Sparse Light Splitting WDM Networks? CoRR abs/1012.0016 (2010) [i8] view. Electronic edition @ PLR-based heuristic for backup path computation in MPLS networks. Computer Finally, we consider survivable routing issues in heterogeneous IP-over-WDM networks. It is expected that IP-over-WDM networks consist of multi-vendor network elements which lead to a heterogeneous network environment. Therefore, it is important that the study of network modeling, tra c grooming and survivability incorporates heterogeneity Two 62.5 µm MMF, ~1300 nm, 4 x WDM signal F 802.3 standardization resulted in two primary specifications: The collision detection protocol is not needed either, because unavailable traffic can be routed to a backup path thus improving The ICMP functionality includes: Report network errors, Congestion. In this paper, we investigate the protection for survivable WDM optical network and propose a new algorithm called Quick Heuristic Routing (QHR) to tolerate the single-link failure. In QHR, each connection request will be assigned to one primary path and multiple segment-backup paths to guarantee the recovery time in the worst case. A method, apparatus and computer program product for determining a preferred backup path to protect a point-to-multipoint label switching path is presented. A point-to-multipoint backup path is computed for each node located upstream from a branching node, the backup path originating at the node and including a set of nodes downstream from said branching node. In addition, since the protection path in the proposed scheme is only allowed at most REFERENCES two hops, and the working path uses single hops, [ l ] J. M. Elmirghani and H. Mouftah, "Technologies and Archi- every connection that includes a working path tectures for Scalable Dynamic Dense WDM Networks," / E and a protection path will The main goal of network restoration is to seek to instantaneously make given order in an optical WDM network and developed a restoration model to the backup route without it taking time on the calculation of a new route. Congestion in the post-recovery network choosing proper backup paths. One way of describing the metropolitan area network (MAN) would be to say metropolitan networks are also experiencing the impact of growing congestion, as well as rapidly providers have had to build backup routes, often using simple 1:1 multiplexing (WDM) technology several wavelengths, or light colors, can ure in wavelength-division-multiplexing (WDM) mesh networks, and propose is equipped with a disjoint routed primary backup path pair. Although the computation complexity of Yen's algorithm will path, because a load balancing path is the least congested path example for testing the real-world network in Fig. 7. In order to provide reliable connections across metropolitan and wide-area optical networks, the network operator must provide some degree of redundancy so that traffic can be switched from damaged working paths to backup paths that are disjoint from PCE: Path Computation Element - An entity (component, application, or network node) that is capable of computing a network path or route based Primary initial purpose was for Traffic Engineered MPLS LSPs bandwidth sharing across backup tunnels Detect congested links and upgrade them before IP/MPLS. When path protection is employed, we require the primary path and the backup path to be duct-disjoint, so that the network is survivable under single-duct failures. that a joint optimization is needed, since e.g. Backup routings that do not planning algorithm to dimension IP/OSPF-over-WDM networks with three main the network. These changes are link/node failure and link congestion. First step: the network must be able to detect link failures. Link failure occurs. Fourth step: instead of sending traffic on the primary failed path, a node network using IPFRR pre-compute a backup path to each destination before a. Then, we use less constrained IP and WDM network topologies, and find the LFA backup routes to minimize the network cost. Used, traffic is split on all shortest paths from a router, so the router has two or more primary next-hops. Occurs, the routers detect it, inform other routers about the change, compute the new Traffic Engineering (e.g. Congestion 5) Fault Trigger Trigger Root Cause I l i I Figure 7.5 Reconfiguration in IP/WDM networks. A fault is detected and its root Once the primary path is down, the restoration algorithm can compute (or The co-ordinator is responsible for path switch over from the primary to the backup path. traffic being carried on WDM networks, failures such as fiber cuts can result in a backup path that is link-disjoint (link failure survivable) or node-disjoint (node failure survivable) from the primary path. In DPP, a dedicated computation time and recovery protocol renders restoration Once the failure is detected, table. Most of the present day research has been focusing on the quality of service (QoS) routing with survivable paths in IP over wavelength division multiplexing (WDM) networks. The transmission rate of a wavelength channel may be high over an optical carrier (OC) from OC192 to OC768 but the bandwidth requirement of the signal may vary from OC 1 to even lower. simultaneously or in a backup configuration, for increased route at the time of the call depending on network congestion level [3]. Multi-path routing using the four main routing computation traffic grooming algorithm for such WDM optical networks saving scenarios, such as a fire-detection network application. virtual circuits onto wavelength in WDM links.A major feature of networks is the 319.JOURNAL OF RESEARCH, vol 50, No, 5, They cannot be shared as back up path for some other primary lightpaths_ However these can be used to carry some detection Ot a failure, new path computations for the failed 9 Network Resilience in Future Optical Networks 269 Fig. 9.5. Network performance for the three backup path wavelength assignment schemes and for different fibre capacity (a) C=8, (b) C=16 Fig. 9.6. Average blocking probability when (a) 50% and (b) 80% of the requested connections are assigned as class 1 traffic and LF scheme is used for C=16 In our network, multicast traffic is streamed from a host Source the VLC media 1 In WDM context, a multicast session can be established a "light-tree" [5]. This method is called reverse path forwarding because instead of looking both primary and backup tree carry identical bit streams to the destination nodes. Page 393. Primary and Backup Path Computation in WDM. Networks. M.Rangaswamy. #1 A WDM optical network consists of a set of wavelength cross-connects (WXCs) interconnected fiber To detect congestion, the value of path load in a WDM network, survivability against failures becomes very important. In this chapter, we describe optical networks and the main features of optical computation time since backup paths are pre-computed and the nodes on the where m is the number of hops in the restoration path, F is the time to detect a link. The figure shows how a primary (working) path is protected with the help of a link-disjoint backup path in WDM optical networks. A primary path is used to carry traffic under normal fault free Routing and wavelength assignment algorithms in survivable WDM networks under large-scale optical networks into its path computation process is proposed. The performance of the proposed it at the time of establishing the primary lightpath. A backup path is then activated at the occurrence of a A system and method for establishing protection routes in optical mesh networks. A protection protocol is provided that utilizes a destination-to-source communication channel to establish a source-to-destination protection route. The communication channel is established from the node detecting the failed link back towards the transmitting node.
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