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GÉANT3 JRA2: Multi-domain Resources and Services

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GÉANT3 JRA2: Multi-domain Resources and Services

Postby nina » 19 Mar 2009, 12:07

Joint Research Activity 2 (JRA2): Multi-domain Resources and Services
Task 3 of JRA2: Monitoring
Experience in GN2 (both operational and within research activities JRA1, JRA3 and JRA4) exposed several challenges to network monitoring that have been tackled partially, but could not be solved during the lifetime of GN2. These challenges originate not only from the fast-paced progress of network technologies, but also from the specific organisational structures encountered in the multi-national co-operation of the European NRENs and GÉANT. Additionally, the spectrum of multi-domain network services has been extended beyond pure IP-based services. Finally, demanding applications under wide scale deployment (streaming media, multicast TV, videoconferencing, HD streaming at Gbps) impose new requirements on the assessment of end to end quality of network services. It is the objective of the monitoring Task of the JRA2 research activity in GN3 to investigate new demands, derive requirements, and elaborate new concepts for network monitoring to foster the provisioning and operation of the GN3 multi-domain services portfolio.
Issues that will be addressed include:

• Cross-layer monitoring: Experience has shown that it is not always sufficient to monitor at a single network layer (e.g. only IP). For investigation of network outages, underlying layers must also be taken into account (for example, Ethernet or SDH/SONET on Layer 2 and optical/electrical status information on Layer 1).

• Monitoring as a means of multi-domain infrastructure management: Tight integration of monitoring techniques into overall management processes (such as fault management) is the basis for sustainable multi-domain operations. Approaches like event correlation, and impact and root cause analysis, close the gap between traditional monitoring techniques and effective multi-domain management. The existing approaches and research topics that are applicable within GN3 will be investigated in conjunction with the overall approach of Task 1 of JRA2 for integrated management functions in the multi-domain environment.

• End-to-end monitoring techniques: These have tremendous importance for the operation of multi-domain services with tight requirements regarding, for example, bandwidth, delay or other Quality of Service (QoS) parameters. Along with true end-to-end measurements, the aggregation of monitoring data from multiple domains involved in provisioning is required.

• Seamless monitoring across organisational boundaries: The exchange of monitoring information between administrative domains is constrained by several aspects, such as privacy and security considerations, especially if campus networks also participate in monitoring. Policies and procedures for sharing monitoring data must be elaborated in conjunction with the workflows for multi-domain management investigated in Task 1 of JRA2

• Monitoring of virtualised network infrastructures: Virtualisation of infrastructures increases the flexibility and adaptability of modern networks. Virtualisation techniques range from VPNs on different network layers, through virtual routers or firewalls, to Overlay and P2P networks. To leverage the operation of virtual networks on a pan-European scale, appropriate monitoring strategies and architectures must be conceived. These will target first the virtualisation techniques used in network operations (SA2) and later the new virtualisation techniques being investigated in JRA1.

• Service Level Agreement (SLA) monitoring: to ensure that the GN3 network provides the required level of service to user traffic in terms of data transport parameters (e.g. packet loss, jitter, etc.),

• Traffic pattern analysis and traffic classification at high link speeds: Increasing link speeds in core networks is putting more and more strain on traffic pattern analysis and traffic classification. New paradigms using hardware and software are necessary to monitor these traffic volumes will be investigated.

Task 3 of JRA2: Work Plan

The work will focus on:
• Alarms: Provide a concept defining when alarms should be raised by whom and how they should be handled and further investigated in the multi-domain environment. Use the correlation of network monitoring information for the interpretation of the current situation. For the correlation, acquire knowledge about the typical impact of events like link failures or rerouting.

• Service lookup: Consider efficiency aspects in the design of the service lookup, in particular in the summarisation of the content of services (e.g. provide a service utilisation archive by compiling summarised utilisation information for the monitored interfaces).

• Netflow monitoring: Investigate how flows should be monitored what information should be made available and how the information should be made available.

• Service generalisation: Provide a proxy concept that masks differences in the individual measurement configurations (Transformation Service).

• Passive monitoring: Integration of passive measurement tools into the perfSONAR monitoring framework as a means to measure performance parameters of flows for assessing end to end quality of network services.

• Traffic burstiness: Investigate how to quantify traffic burstiness in order to assess its effects on perceivable network characteristics, such as delay and jitter.

• Intelligent traceroute: Investigate how to implement an intelligent traceroute-like tool that will provide performance information about the components of a network path to assist in locating performance limiting points.

The conceptual work must consider the deployment that is planned for the monitoring software. In addition to the target user groups considered so far (see below), the monitoring system should be suited for university campus and research facility environments. This requires an easy-to-deploy and easy-to-maintain solution. Scalability and policy aspects require that monitoring infrastructure is based on distributed components so that a transition of such infrastructure towards distributed operation can be supported.

For the standardisation of GN2-developed perfSONAR protocols and schemas, active participation in the OGF is planned (previously done indirectly via Internet2).
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