ITR: Network and Traffic Engineering for DiffServ MPLS-Based Networks

区分服务（DiffServ）和多协议标签交换（MPLS）技术的结合使用是在IP网络中提供服务质量（QoS）同时有效地利用网络资源的有希望的方式。 然而，为了在MPLS网络上有效地承载DiffServ业务，需要DiffServ类和LSP之间的映射。 此外，这样的网络的设计和管理是一个基本的关键，成功的QoS提供，它包括几个开放的研究问题。 需要解决许多问题，如LSP尺寸，建立拆除过程，路由，适应实际承载的流量，抢占，网络拓扑的初始定义等。此外，在设计网络规划和管理方法时，我们必须考虑到互联网流量的高度不可预测性。我们的建议是一项全面的研究，描述了MPLS网络规划的实用解决方案，沿着带宽和路由管理，它们以协同方式相互作用。 所提出的想法是新的范例，允许MPLS网络，以适应他们的状态，以提供最佳的性能和资源利用率。 我们建议设计、评估和调整这些新的想法。在该项目的带宽管理部分，将设计LSP设置，规模，抢占和容量分配的新方法。 路由管理研究包括LSP路由和带宽请求路由的新算法。最后，在网络规划研究中，我们将调查的方法来设计最佳的MPLS网络拓扑结构和它的尺寸的基础上预测的流量负载和长期的服务水平规范（SLS）contractions.To说明上述研究课题的相互关系，考虑一种情况下，网络规划方法提供了一个初始的MPLS网络拓扑结构。 可能的事件包括LSP建立请求的到达或带宽请求的到达。 第一个事件可以通过组合使用我们提出的三种方法来处理，顺序为：LSP路由，LSP抢占和LSP容量分配。 LSP路由的目的是在物理网络上找到LSP将被路由的路由。 LSP抢占决定在没有足够可用带宽的情况下，是否可以在路由上抢占任何现有LSP，以便为新LSP让路。 LSP容量分配方法尝试微调LSP容量以避免未使用的预留带宽。 带宽请求到达的事件触发LSP设置和尺寸，这可能反过来触发路由，抢占和容量allocation.The潜在的影响LSP创建步骤的建议是开发新的和实用的方法，目前是开放的问题，在基于DiffServ-based MPLS网络的设计和管理。在我们的出版物中，MPLS网络管理的研究已经取得了重大进展和贡献。 这一先前的工作将有助于实现拟议的目标。

The combined use of the Differentiated Services (DiffServ) and Multiprotocol Label Switching (MPLS) Technologies is a promising way to provide Quality-of-Service (QoS) in IP networks, while effectively using network resources. However, to efficiently carry DiffServ traffic over an MPLS network, a mapping between DiffServ classes and LSPs is needed. Moreover, the design and management of such a network is a fundamental key to the success of the QoS provisioning and it includes several open research issues. Many problems need to be solved such as LSP dimensioning, set up tear down procedures, routing, adaptation to actual carried traffic, preemption, initial definition of the network topology, etc. Furthermore, in designing network planning and management methods, we have to take into account the high unpredictability of the Internet traffic.Our proposal is a comprehensive study that describes practical solutions for MPLS network planning along with bandwidth and route management, which interwork in a synergetic fashion. The presented ideas are novel paradigms that allow MPLS networks to adapt their state to provide the best possible performance and resource utilization. We propose to design, evaluate and fine-tune these new ideas. In the bandwidth management portion of the project, new methods for LSP setup, dimensioning, preemption, and capacity allocation will be designed. The route management research includes novel algorithms for LSP routing and bandwidth request routing. Finally, in the network planning research we will investigate methods to design the optimal MPLS network topology and its dimensioning based on predicted traffic loads and long term Service Level Specification (SLS) contracts.To illustrate the inter-relations of the above mentioned research topics, consider a scenario where network planning methods have provided an initial topology of the MPLS network. Possible events include the arrival of a request for LSP setup or arrival of a bandwidth request. The first event can be handled by the combined use of three of our proposed methods, in the order: LSP routing, LSP preemption, and LSP capacity allocation. The LSP routing aims to find the route on the physical network over which the LSP will be routed. LSP preemption decides if any existing LSPs can be preempted on the route to make way for the new LSP in the case in which there is not enough available bandwidth. The LSP capacity allocation method tries to fine tune the LSP capacity to avoid unused reserved bandwidth. The event of arrival of a bandwidth request triggers the LSP setup and dimensioning, which may in turn trigger the LSP creation steps of routing, preemption and capacity allocation.The potential impact of this proposal is the development of novel and practical methods which currently are open issues in the design and management of DiffServ-based MPLS networks. Significant progress and contributions to the study of MPLS network management have already been made in our publications. This previous work will be useful towards achieving the proposed objectives.