From Aristas Q3 report.....good insight, 42% of revenue is from Meta & Microsoft. 

Historically, large purchases by a relatively limited number of end customers have accounted for a significant portion of our revenue. We have experienced unpredictability in the timing of orders from these large end customers primarily due to the time it takes these end customers to evaluate, test, qualify and accept our newer products, the overall complexity of these large orders and changes in demand patterns specific to these customers, including reductions in capital expenditures by these customers and the impact of cost reduction and other efficiency efforts by these customers. For example, sales to our end customers Microsoft and Meta Platforms in fiscal 2022 represented 16% and 26% of our total revenue, respectively, whereas sales to our end customer Microsoft in fiscal 2020 and 2021 amounted to 22% and 15% of our total revenue, respectively, with our end customer Meta Platforms representing less than 10% of our total revenue in both fiscal 2020 and 2021.