I am currently looking at a network topology consisting of ~40 DUTs. In this network, there is no hierarchy (like access core and distribution), and all the switches are connected in chain topology. Currently we have 6 switches chained together, each switch connecting to 6-7 DUTs (each DUT can have more than one copper port so thats why there aren't many DUTs per switch). The switch at the top of the chain has the only link to external network and all the other switches in the chain use this so that DUTs can access the external network.
Is there any other issue with this network topology especially if more DUTs will be added in the future? One issue I can find at the moment is if one of the switches in the middle of the chain goes down, all other DUTs from that point downwards to the chain will be inaccessible. I am trying to justify why a different topology would be required for this network so that new equipment can be purchased.