Community Research and Development Information Service - CORDIS

Verified the practicability of deploying diffserv-based QoS mechanisms across site, access and core IPv6 production networks

Activity 4.4 of 6NET was concerned with IPv6 Quality of Service (QoS). QoS tests were carried out by various partners in 6NET.

Initially, each partner conducted IPv6 QoS tests on their local testbed infrastructure. Once these initial phases were completed, further QoS tests between partners across the 6NET infrastructure were performed.

The majority of the tests were concerned with the provision of IPv6 Differentiated Services. In particular, attention was paid to the provision of EF (Expedited Forwarding), AF (Assured

Forwarding), LBE (Less-than Best Effort) and BE (Best Effort) based services; their interactions and appropriate configuration and tuning of router resources.

In addition, the provision of Integrated Services using RSVP in a Mobile IPv6 environment was studied.

Most of the partners analysed the operation and interaction of QoS mechanisms, e.g. shaping or queuing, in local IPv6 testbeds or production networks and validated the performance of QoS implementations for different platforms, such as commercial routers from different vendors. Also, a QoS model that is capable for 6NET s backbone network was proposed and described.

In a second phase, partners took into account the defined QoS model and extended the QoS activity into 6NET’s backbone network. Initially, the proposed QoS model, which is based on Differentiated Services (DiffServ) architecture, was studied taking into account several aspects, such as the network dimensioning process, policing and admission mechanisms

deployment. In particular, the 6NET QoS model included the implementation of the IP Premium service, which is based on EF (expedited forwarding) PHB (Per Hop Behavior) and provide absolute prioritisation to this type of traffic. It also includes the BE (Best Effort) and the LBE (Less than Best Effort) services. Afterwards, the appropriate configuration that allowed 6NET to provide QoS services was formed and possible conflicts with other network services were identified.

The configuration was applied to all 6NET s backbone network routers providing the aforementied QoS services to the connected NRENs. Finally, a number of tests were defined and performed in order to evaluate the performance of the QoS services in the 6NET network. The prioritisation method was initially examined, by testing the marking, traffic policing and traffic shaping mechanisms. A wide range of scenarios with various patterns of foreground and background traffic were performed in order to thoroughly investigate the applied QoS model and its impact.

The performed QoS tests in 6NET backbone indicated that this IPv6 QoS model can be the basis for production services. The mechanisms under test operated efficiently, as the experimental results prove, without any performance degradation on backbone routers. The above observations remained true even in heavy network congestion and the final performance results that a user or an application experienced corresponds to the QoS service’s specification.

It was noted that the IPv6 flow label is not currently used in the IPv6 world but its usage is expected be increased in the near future. The IPv6 flow label has been recently standardized and prior to become widely adopted form the applications many aspects, such as security and admission control, have to be investigated in depth.

Related information

Result In Brief

Reported by

Computer Science
Computing Department, Lancaster University
LA1 4YR Lancaster
United Kingdom
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