Virtual-Network-Based Highly Available Ethernet Access Network
| Autor: | Yi, Chih-Tsao, 易智超 |
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| Rok vydání: | 2009 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 97 Ethernet is envisioned as a key technology to recent deployments of service network. Ethernet features in high scalability, very high bandwidth provisioning, inexpensive, and easy deployment. However, the major drawback of Ethernet is its lack of supporting carrier grade services. In this thesis, we consider to support carrier grade service for Ethernet access network. In addition, we aim at further reducing the switch cost by requiring less functionality in switches. To do so, we propose a virtual-network-based access architecture. The concept of virtual network is not new. Nevertheless, as far as we know, we are the first to extend its usage to study the fault-tolerant-related issues in Ethernet access networks. In this thesis, we elaborate on determining the configuration of virtual networks so that the service can be recovered when a fault occurs. Our goals for the virtual network configuration are basically requiring least VLAN functionalities in switches, enabling fast service recovery process upon an occurrence of faulty link/switch, and sustaining the scalability of access network. Our proposal basically employs the one-plus-one backup principle to enable fault tolerance. Our proposed protocol is very simple and can be carried out entirely by software approach. Besides, our proposed architecture only needs minimum VLAN function for switches. Traditional application in our proposal, we can service up to 512 customer networks in the access network. In military network and the proprietary network, the scalability would not be the issue. To evaluate the degree of carrier grade service of our proposal, fault-tolerant-related behavior is modeled by a continuous-time Markov chain (CTMC). Through the analysis, we also aim at discovering the rule of thumb to keep high degree of carrier grade. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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