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That sounds like the issue to me also
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I am new to switch management. &nbsp;I have a stack of 4 switches. One of the switches in the stack is down. In the web interface of the stack it says &quot;Unit Down&quot; for one of the 4 switches in the device physical view. &nbsp;The stack was power cycled but this switch did not come back up. &nbsp;It still has power but nothing else. I do have config backups of the stack. &nbsp;Should I just try to restore a backup? The rest of the switches are working fine. &nbsp;The switch is a Nortel 4548gt-pwr.
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I am new to switch management.  I have a stack of 4 switches. One of the switches in the stack is down. In the web interface of the stack it says "Unit Down" for one of the 4 switches in the device physical view.  The stack was power cycled but this switch did not come back up.  It still has power but nothing else. I do have config backups of the stack.  Should I just try to restore a backup? The rest of the switches are working fine.  The switch is a Nortel 4548gt-pwr.

4548gt-pwr unit down

A switch is a device that filters and forwards packets of data between LAN segments. Switches operate at the data link layer or the network layer of the Open Systems Interconnection (OSI) Reference Model and therefore support any packet protocol. LANs that use switches to join segments are called switched LANs or, in the case of Ethernet networks, switched Ethernet LANs. A hub is a connection point for devices in a network. Hubs are commonly used to connect segments of a LAN. A hub contains multiple ports; when a packet arrives at one port, it is copied to the other ports so that all segments of the LAN can see all packets.