The relationship between management and control planes for delivering quality of service in multi-service networks.
Doctoral thesis, UCL (University College London).
The management and control planes are intrinsic components of communications networks. Control plane functions - such as routing - are on-line mechanisms responsible for establishing and maintaining the way data is routed and forwarded through the network and, as such, they are usually embedded within network elements. Management plane functions, on the other hand, include tasks such as network design, planning, configuration and fault handling. Management algorithms - such as traffic engineering logic for link-weight optimization - are off-line components operating over longer time-scales with a broader scope and are usually housed in separate management workstations. Delivering Quality of Service in multi-service networks is a non-trivial task that involves both on-line mechanisms – for traffic differentiation and resource scheduling - and off-line functions - for service definition, resource planning and traffic engineering. This thesis addresses the question of the degree to which off-line management plane functions and on-line control plane functions should cooperate in order to provide the benefits of network-wide optimization while remaining responsive to actual network conditions without burdening the network equipment with computationally expensive logic. The approach taken is to design an architecture encompassing all functions involved in QoS delivery, ranging from service definition, through network planning and provisioning, to network configuration, routing and forwarding. Interactions in the form of provisioning cycles are defined to facilitate the necessary cooperation between off-line management plane algorithms and on-line control plane mechanisms. Two specific mechanisms are designed and evaluated. Firstly, Dynamic Resource Management (DRsM) configures the bandwidth allocated to Per Hop Behaviours in Differentiated Services networks. This is achieved in cooperation with off-line traffic engineering functions that identify the required resources according to predicted traffic levels. Because demand may differ significantly from predicted demand DRsM is responsible for tuning the allocation of resources according to actual conditions. Secondly, QoS enhancements to the Border Gateway Protocol (q-BGP) include QoS attribute values in BGP UPDATE messages as well as extensions to the route selection process to make it QoS-aware. Off-line management plane algorithms define the attributes to be propagated and the route selection policies to be adopted by the control plane.
|Title:||The relationship between management and control planes for delivering quality of service in multi-service networks|
|Additional information:||Authorisation for digitisation not received|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering|
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