1 Sept. 13, 2000 Choong Seon HONG and EunChul Kim An Integrated Service Management Architecture for Assuring SLA in Multi-layer Networks

Outline  Integrated CNM Concept  Modeling of Integrated CNM with SLA Monitoring  SLA Metrics for Multi-layer Networks  Computational Model for Proposed Architecture  Implementation  Conclusions

Introduction  Service level agreement –Key criteria when customers choose service providers  Service level assurance –Becoming more important ingredient in competition environment  How to monitor and report SLA metrics –Not simple to monitor SLA per customer in new data networks –Adopting the extension of legacy CNM concept  Historical performance, fault and configuration data + SLA monitoring and reporting functionalities  Integrated CNM architecture –Including frame relay, ATM, IP networks as multiple-layer networks –Providing consolidated view for customer’s own portion –Providing various SLA metrics for multiple layer networks

Integrated CNM Concept  Existing CNM works –providing customer control and monitoring capabilities of his/her portion of public networks –addressing the definition of management information for specific layer network  Supporting multiple layer networks –adopting layering concept and abstraction mechanism for CNM information –using data network services over multiple layer networks –coordinating CNM information which is dependent on each layer network  integrating to one unified CNM information

Network Management Environment for Multi-layer Networks

Integrated and Separate CNM view for Multi-layer Network  Abstraction mechanism for end-to-end PVCs and customer’s own logical or physical ports at service management level

Approach that Makes Integrated CNM Information  Offering CNM services without efforts for correlation of management of different layer networks –getting all information of customer own networks by contacting one CNM system in operator domain  Can care the characteristics of the specific layer network management information –for example, when monitor ATM PVCC for Internet access, customer can get IP layer view and VC layer view, separately  Can make decision to plan, reconfigure customer networks from the physical layer network (e.g., DS3 physical links) to the top layer network (e.g., IP layer)

Modeling of Integrated CNM with SLA Monitoring

Modeling of Integrated CNM with SLA Monitoring (Cont’d)  Integrated CNM model for multi-layer networks using standard CNM information model and extended TINA’s NAP, NFC and NFEP information objects –ATM-Forum M3, IETF RFC 1695 of CNM MIB for ATM –FR Forum, IETF RFC 1604 of CNM MIB for Frame Relay –Adopting PCG (Physical Connection Graph) concept of TINA  Mapping relationship between standard CNM Model and PCG –Integrating features of standard CNM MIB

Information Model for Integrated CNM

Information Model for Integrated CNM (Cont’d)  NAP : abstract model of physical port of a CPN or a CPE –T B : point between B-NT1 and B-NT2 for B-ISDN reference model –Attributes that represent physical layer information  ex) “layerConfig” : Max. Number of VPC/VCC, Max. VPI/VCI bits  NFC : modeling the generic bearer connectivity for real layer network resources to make information flow –Having NFEPs for source and destination (VPI/VCI or DLCI)

Common SLA Metrics for Multi-layer Networks  No explicit standard or concrete industrial agreements for SLA metrics  Selecting a set of common SLA metrics regardless of specific layer network technology  Availability  Delay  Throughput  MTTR (Mean Time To Respond)

Computational Model of Integrated CNM  Managing the lifecycle of CNM information objects –NAPConfigurator, NFCConfigurator, LayerCoordinator  Representing correlated information objects in terms of computational views : maintained by NAPConfigurator and NFCConfigurator –NFC, VCl, NFEP, NAP  Taking the responsibility for customer contact points –cnmUserAgent, cnmMonitorAgent, cnmControlAgent  Managing historical management information related to performance and fault –trafficDataLogger, faultEventLogger, faultEventProcessor  Calculating and reporting SLA metrics –cnmScheduler, performanceStatGenerator, SLAMetricsCalculator, SLAReportGenerator

Computational Model of Integrated CNM (cont’d)

SLA Monitoring and Reporting Mechanism

Implementation Environment  Middleware : orbix 2.x  Web Tech. : MS IIS 4.0 with Server Scripting and Database Connecting Capability  For direct access to DB : ODBC, ADO  DBMS : Oracle 8.x

Implementation Environment (Cont’d)

How to Measure SLAs for IP Connections

How to Measure SLAs for IP Connections (cont’d)

Conclusions  The extension of legacy CNM concepts suitable for SLA monitoring and reporting –using most legacy CNM system’s functionalities –adding functionalities for defining new SLA metrics  Benefits of proposed architecture –covering multi-layer networks such as Frame Relay, ATM, and IP networks  can correlate management information of different layer networks  can care the characteristic of the specific layer network management information  can get the information for planning and reconfiguration customer networks from physical layer network to the top layer network  Deploying the proposed architecture – July 1, 2000

Further Study  Proposing SLA Metrics for End-to-end IP Connections  Flow Control Mechanism for Real-time Streaming on End-to-end IP connections