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When a link or node failure occurs in a network, flows are detoured and therefore the hop counts of the flows increase. This increase could drastically deteriorate the quality of a network. The flow hop length stability as well as network connectivity is important for network reliability. We investigate a network design method that improves stability and connectivity of a network during a failure...
The server mirroring method has extensively used as the technology for contents delivery networks. Several mirror servers that serve same contents are located in a network, and an access is navigated to one of the mirror servers based on the delay time and the load balance. The location of the mirror servers with high reliability against a failure and small delay times of accesses is important. In...
Open shortest path first (OSPF) is the most commonly used intra-domain Internet routing protocol. As the routes of paths are determined by basically only the link metrics, many paths may pass a link with small metric; therefore, there is high possibility that it causes the congestion of the link. It is essential that the number of the paths with large traffic in a link is limited to avoid a congestion;...
When a link or node failure occurs, flows are detoured around the failed portion, so the hop count of flows could change dramatically as a result of a failure. It is therefore important to evaluate the reliability of backbone networks from the viewpoint of flow hop length stability as well as network connectivity. In this paper, we analyze the possible primary causes of the degradation of reliability...
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