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208 Deploying and Managing IP over WDM Networks IXIA-1 IXIA-2 PE -1 DEMO -1 DEMO-2 Node-1 1. There are two LAN sites as shown in Figure 11.1: P-3 Node-3 Figure 11.1 Physical entities used in the experiment. • LAN-1 contains the multimedia customer Demo-1 and a traffic generator IXIA-1 intended to create the interfering traffic in the site. • LAN-2 contains the multimedia customer Demo-2 and a traffic generator IXIA-2 intended to create the interfering traffic in the site. 2. There is pure layer-3 (IP) connectivity between routers PE-1–PE-3 and between routers PE-1–PE-2. The IP link between PE-2 and P-3 is configured but not operational because there is no physical (WDM) connectivity, so communication between PE-2 and P-3 is feasible only through PE-1. 3. The 10/100 Ethernet ports between the core routers are configured at 10 Mbps so that we can easily saturate the direct link PE-1–PE-2. This kind of configuration also limits the bandwidth available in each WDM λ to 10Mbps. This does not decrease the functionality of the network because it will only decrease its bandwidth to values that are more suitable for testing purposes. 4. The WINMAN system has the following policies activated: • Authorization policy for the interference traffic. In order to establish an IP link for interference traffic between PE-1 and PE-2, there must be a policy that specifies the authorization to do it. Therefore, a PE -2 Node-2
Evaluation of IP over WDM Management Solutions 209 positive authorization policy to create IP SNCs between the involved PTPs will be active. • Denying ICS establishment by policies. Once the interference traffic is established and the poor video quality over the congested link is demonstrated, the WINMAN operator will try to establish an ICS for the multimedia traffic. Here, we will apply two policies: a negative authorization one to avoid establishing a new wavelength path in the WDM layer between nodes 2 and 3 and a second negative authorization policy to disable an alternate IP link for the intended ICS. This is: 1. Negative authorization between CTPs of WDM nodes 2 and 3; 2. Disable IP links between PE-1 and P-3. 11.5.1.2 Scenario Steps This list describes a global scenario decomposed into subscenarios that explicitly show the different functional attributes of the WINMAN solution. 1. Without congestion, the network establishes a videoconference between Demo-1 and Demo-2 using the conventional best-effort IP routing and forwarding. In this condition, good quality of videoconference shall be observed. Each party sends 1.5 Mbps of video/voice traffic. 2. The IXIA-1 customer requests an ICS between PE-1–PE-2 for 9.5-Mbps guaranteed bandwidth. This involves the creation of a bidirectional LSP between both routers with this bandwidth constraint. 3. The WINMAN operator sends a request to WINMAN for this ICS creation. 4. The first policy (authorization for interference traffic) allows the creation of that ICS, so WINMAN proceeds to establish the LSPs between the involved routers, making the necessary bandwidth reservation. 5. The two interference generators start injecting traffic, making use of all of the requested bandwidth. 6. In this network condition, the quality of the best-effort videoconference between Demo_1 and Demo_2 will be affected. This substantiates that the WINMAN-reserved MPLS traffic is prioritized over the best-effort video traffic that is partially dropped, resulting in a nonpure video reception quality.
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Deploying and Managing IP over WDM
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Deploying and Managing IP over WDM
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Contents Foreword xv Preface xix Ac
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Contents vii 4.2 The WDM Network El
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Contents ix 8 Management System Des
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Contents xi 10.3 The WINMAN Testbed
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Contents xiii 13.4.1 Adoption of Op
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xvi Deploying and Managing IP over
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Preface The integration of the Inte
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Coauthors of the IST-OPTIMIST proje
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1 Introduction 1.1 The Importance o
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communications. These legacy networ
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Within these programs, consortia of
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8 Deploying and Managing IP over WD
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10 Deploying and Managing IP over W
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4 Management of the WDM Network Lay
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λ1λ 2 ··· λ w λ1λ 2 ···
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Management of the WDM Network Layer
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• Lightpaths that may be protecte
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• Wavelength continuity. Two conn
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4.4.4 Management Interfaces Managem
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5 IP Over WDM Integration Mechanism
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STM1/ATM interface requirements. Fo
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IP router OLA The version of IP ove
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Gigabit Ethernet interface GbE prov
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the IETF extended the MPLambdaS fra
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ASON/ASTN. ITU-T will try to push t
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The proposed management solution is
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IP Over WDM Integration Mechanisms
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100 Deploying and Managing IP over
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8 Management System Design and Impl
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Management System Design and Implem
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checking is done at the very beginn
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8.4.1 The Inventory Model The inven
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for any of the three WINMAN NMSs. T
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Future Developments and Challenges
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About the Editors Joan Serrat recei
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