Optical Network Management Perspective for Quality Assurance

1. Optical Network Management Perspective for Quality Assurance Dr. Ardian Greca Yamacraw Assistant Professor Department of Computer Sciences Georgia Southern University Phone: (912) 681 0170 naidrag@ieee.org

2. Introduction (The impact of network failures) Conclusion: A single cable cut can lead to a dramatic amount of lost traffic

3. Increasing Traffic

4. Some failure rates

5. Transmission Networks

6. Core Transmission Networks

7. Network Protection : Ring

8. Network Protection : Mesh Network

9. WDM Transport Network Model

10. Proposed TMN – based Network Survivability Management System

11. Proposed System Components • NSMS should be able: • to evaluate the response procedures • replan the response procedure when the network topology changes, • update restoration techniques, • or if the required survivability requirement is not met yet • analyze the performance • failure the recovery can be static or dynamic. • The static technique performs the recovery by using the pool capacity strategy. • The dynamic recovery uses more intelligent techniques and leads to effective local reconfigurations. • NSMS has a spare resource allocation control function to ensure efficient resource utilization

12. Proposed System Components • Network survivability status monitor • Surveillance • detect the NE under failure • which part and layer are currently controlling the restoration process • how the restoration process deal with the failure • Control • control the number of connections that are rerouted and where are rerouted • which connection should not be rerouted at all • Test • initializes a survivability test (i.e., simulate failures • do not interrupt the network! • Evaluation • evaluates survivability process

13. Survivability Control System • The survivability control system (SCS) is a very important function of NSMS, because there are several failure types and restoration techniques for a network layer. • SCS will respond with the right restoration technique(s) to a failure, since the performance of one technique might not meet the overall survivability-cost requirements of the network.

14. Survivability Control System • Restoration technique function, • Recover the failure inside one layer without affecting other layers • Can use different techniques • Priority restoration function and • Choose appropriate technique • Cost effective technique • Alteration control. • Use parallel activation • Use sequential activation

15. Protection in optical layer

16. Recovery on upper layers

17. Comparison between two activation mechanisms • Parallel activation: • Advantages • fast restoration, because there is no need to coordinate different techniques, • Disadvantage • could lead to inefficient resource utilization • causes resource waste after restoration. • NSMS should update spare resources in the network, but unfortunately this process is very complex and can lead to a disruption of new incoming calls. • Sequential activation • Advantages • does not have the above mentioned problems • can be easily controlled, • Disadvantages • might lead to a longer restoration time

18. Timing issues • time to detect the failure at layer i is TDi. This time, TDi, for the lowest layer determines the time to detect the failure, • elapsed time to generate an alarm indication message from layer i to the layer i+1 is TAi, • estimated restoration time for a given restoration technique in a given layer i is TRi,

19. Using Agents • Run computation- and communication- intensive applications in real time • End users interact with their applications when they are running • Applications • Telecommunications • Interactively steered high performance computations • Data mining • Distributed interactive simulations • Smart sensor and instruments • Math calculations • Etc…

20. Agents vs. conventional object-based representations • Why? • Re-use without Re-work • Increased throughput (provides parallel processing) • On-line reconfigured applications in response of user request or user behavior change • End users do not need to be aware of the current task representation • Information obtained can be personalized to the information seeker • Increases trust since information gathered from different agents • Know where to get the information • Better interaction … • Etc…

21. Agent Cooperation • the agent management platform will consist • on the functions of network task management, • agent task scheduling, • communication and agent management • agent generation, • dispatch, • clone, • registration and dismissal • Agents will be composed into sequent queue or parallel sub-tasks. • sub-tasks will be provided to agent scheduling function to perform the task schedule for multi-agents. • Agents will be produced and assembled with the service code and dispatched to perform a certain job. • free agents needed by the busy agent at the target node to help the busy agent to accomplish its task.

22. Agent Cooperation • From the network management requirements point of view, we design two kinds of intelligent agents. • One we call the common agent and • the other the scheduling agent. • Both agents will be equipped with knowledge database where they can store the information they got from the environment. • Agents communicate with each other or with the management platform through communication function. • Scheduling agents have a scheduling code to manage all agents in their groups. • Scheduling agents can give some new service code to free agents and make them to perform a new task.

23. Conclusions • Propose a network survivability management system as a new independent function structure, focusing on its architecture. • NSMS compound functions are established and described • NSMS will preplan and download to every NE the response procedure, by coordinating different restoration techniques in different layers. • uses the global survivability strategy • sequential activation mechanism to construct cost-effective survivable WDM networks. • The management function is based on the multi-agent framework, • and a coordination protocol is also proposed. • Future work • an integrated spare resources control that considers different restoration techniques, • and how to determine the best restoration techniques for a given failure. • strongly related with the network size, traffic pattern, and the network cost. • to analyze problems for communication between NSMS and agents when the network is heavily loaded.