Research of local network reliability indicators during the implementation of the port aggregation scheme

The article is devoted to a relevant scientific and applied problem related to the improvement of potential solutions for increasing the reliability of local networks by means of link (port) aggregation on switches. The article presents a study aimed at a comparative quantitative analysis of the reliability level of a local network in which the mechanism of link (port) aggregation is implemented. The technological task is formulated in the form of a mathematical model for calculating the probability of network uptime with a port aggregation scheme. The boundary values of network reliability indicators are calculated depending on the level of reliability of individual links and the implemented port aggregation scheme, for which the code in MATLAB is written and the corresponding graphs are constructed. It is established that at the level of local networks, the implementation of the mechanism of link (port) aggregation is an effective means of increasing their performance and reliability. The conditions under which this scheme is most appropriate are substantiated. It is demonstrated that in these conditions when implementing the aggregation scheme, it was advisable to limit ourselves to four links. The study results have confirmed the effectiveness of the proposed solution for aggregating links (ports) and allowed us to formulate general recommendations related to the implementation of reliable routing in practice. Consequently, it is proposed to use four aggregated links, provided that the probability of link failure is between 0.5 and 0.7. If the probability of link failure exceeds 0.7, it is advisable to limit the number of aggregated links to two. Further increases in the number of aggregated links affect the cost and performance of the network but do not improve reliability.