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  1. Y. Wang, Adding Multi-Class Routing into the DiffServ Architecture, Master's Thesis, Networking Laboratory, Helsinki University of Technology, 2004 (pdf)(bib)
    Abstract: In this thesis, we introduce the multi-class routing (MCR) scheme into the differentiated services (DiffServ) architecture in order to alleviate the inter-class effects and optimize the network traffic in the DiffServ network. The thesis begins with the overview of some background knowledge, including the DiffServ network, OSPF protocol and some routing algorithms. We describe basic concepts and significant principles.\ The MCR scheme, which is introduced into the traditional DiffServ architecture, forms our MCR DiffServ architecture. The MCR DiffServ architecture focuses on the intra- DS domain. Different MCR approaches that include static approach and dynamic approaches can be used for the MCR DiffServ system. Compared to a traditional DiffServ system, our MCR DiffServ system adds the MCR manager module and classbased route selection block. The implementation of the MCR manager closely depends on the routing protocols.\ We extend the OSPF protocol to support the MCR capability, and design the software architecture for the OSPF with MCR extensions. Based on the Zebra software, our OSPF code, which supports the static MCR, is successfully implemented. It can provide two independent routing tables created by the SP algorithm and the BSP algorithm. Several tests for our OSPF code are used to demonstrate the work of the OSPF with MCR extensions.\ As a result, our OSPF with MCR extensions can achieve the basic functions of the MCR manager for the MCR DiffServ system. The static MCR approach is implemented for the MCR DiffServ system.