1. An Adaptive Policy-Based Framework for Network Service Management Leonidas Lymberopoulos Emil Lupu Morris Sloman Department of Computing Imperial College London

2. Roadmap Policy-based management Service management issues Ponder - Policy language Policy adaptation within the Ponder framework Enforcement architecture for an adaptive policy system Implementation of a prototype adaptive management system

3. Policy-based management The fundamental objective of policy-based management is to allow flexible and adaptive management where the policies define the adaptation choices or strategy which can be modified without recoding or even shutting down the system. Service Adaptation –Service adaptation may take place either as a result of failures within the system or to accommodate changes in clients application requirements.

4. Roadmap Policy-based management Service management issues Ponder - Policy language Policy adaptation within the Ponder framework Enforcement architecture for an adaptive policy system Implementation of a prototype adaptive management system

5. Service management issues Satisfy the Service Level Agreements (SLAs) established in an enterprise. Guaranty the Quality-of-Service offered to the applications using a service. A management system that can automatically derive information from service specific information. Support dynamic service management. Authorization should be part of the management system.

6. Roadmap Policy-based management Service management issues Ponder - Policy language –Obligation policies Policy adaptation within the Ponder framework Enforcement architecture for an adaptive policy system Implementation of a prototype adaptive management system

7. Ponder - policy language Ponder is an object-oriented, declarative language for specifying management and security policies. –Subjects objects –Target objects –Domains Provides reuse by supporting definition of policy types.

8. Obligation policies Specify the actions that managers must perform when certain events occur, and provide the ability to respond to changing circumstances. Are event-triggered condition-action rules. Syntax

9. Roadmap Policy-based management Service management issues Ponder - Policy language Policy adaptation within the Ponder framework –Run-time modification of policy parameters –Adaptation by dynamically selecting/enabling policies from a set of policies Enforcement architecture for an adaptive policy system Implementation of a prototype adaptive management system

10. Policy adaptation within the Ponder framework Policy Adaptation –Describe the ability of the policy-based management system to modify system behavior in one of the following ways: Run-Time modification of Policy parameters Adaptation by dynamically selecting and enabling policies from a set of policies Adaptation by learning which are the most suitable policy configuration strategies from the system behavior

11. Run-time modification of policy parameters New adaptation strategies can be incorporated into the management system by –adding new policies which react to different evens using the existing policy actions –replacing existing policies with new versions, which either implement new actions on the managed objects new action on the Policy Management Agents

12. Adaptation by dynamically selecting/enabling policies from a set of policies Higher-level control policies are triggered by reconfiguration events and determine which lower-level network policy must be enable/disable to adapt the configuration of the management system. Service Management Policies are an example of these higher-level policies.

13. Roadmap Policy-based management Service management issues Ponder - Policy language Policy adaptation within the Ponder framework Enforcement architecture for an adaptive policy system Implementation of a prototype adaptive management system

14. Enforcement architecture for an adaptive policy system

15. Roadmap Policy-based management Service management issues Ponder - Policy language Policy adaptation within the Ponder framework Enforcement architecture for an adaptive policy system Implementation of a prototype adaptive management system