Research of reliability indicators of a local infocommunication network fragment
DOI:
https://doi.org/10.30837/pt.2023.2.02Abstract
Based on the analysis, it is established that to ensure and improve the reliability of information and communication networks (ICN), it is necessary to comprehensively involve the functionality of all layers of the Open Systems Interconnection reference model. The solutions of individual layers should be implemented systematically in different parts of the network and when protecting (backing up) different types of network elements — routers, links, and paths. The Cisco Packet Tracer simulator was used to design a reliable local information and communication network. At the level of the local network, which operated using Ethernet technology, the structural reliability was increased by introducing additional links between switches to create a strongly connected topology. The use of the STP protocol, namely its PVST+ and Rapid PVST versions, made it possible to ensure quick response to network failures of its elements — routers and communication links between them. The HSRP fault-tolerant routing protocol was configured to ensure access to WAN services. The results of the ICN testing confirmed its high reliability level during network uptime and in the face of possible failures. The article analyzes the reliability level of several network topologies. The analysis focused on the impact of the reliability level of individual links and structural redundancy on the probability of fault-free operation of connections between different network switches. The analysis results confirmed that introducing redundancy in the network topology increases ICN structural reliability. The obtained quantitative results allow us to justify the choice of a particular topology to ensure a given level of structural reliability. Based on the results, it is possible to develop recommendations for choosing a specific network topology depending on the state of the switches, their ports, and the requirements for the reliability level of the ICN in general.
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