unidentified network can happen if you have configured a static ip address and the port is configured for a vlan with a different subnet.
Or if youre clients tries to get an ip by dhcp and the configured vlan does not have a dhcp server.
But back to your question, if your not using a network management tool which monitors the mac adresses connected to a switch port, you must use the command, which you already know:
Aruba-OS: show mac-addr | in 4c3f
Aruba-CX: show mac-addr | in 4c:3fI would recommend to set the client to dhcp, and to reconnect the cable on the client. With dhcp enabled there should be an dhcp request broadcast, and the clients mac adress should be seen for at least 5 Minutes along the way through the network.So you can begin your research on the client-switch you will expect the client, or you can begin on most central point of your network, where all the client traffic has to be passing (like core, distribution or aggregation switch).
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