Thank you for asking this question in the support community. To enable the "MGMT" port on the NetVanta 1638, you can use either the CLI, or the web interface (GUI).
In the CLI, perform the following configuration steps:
(config)#interface ethernet 0/1
(config-eth 0/1)#no shutdown
(config-eth 0/1)#ip address <address> <subnet mask>
In the GUI, perform the following configuration steps:
System Summary > eth 0/1 > "check the "Enable" box" > "Assign the IP Settings" > Apply
I hope that makes sense, but let me know if you have any additional questions or information. I will be happy to help in any way I can.
Ok, thanks Levi. That answered my question.
It wasn't labeled eth and it wasn't on physical interfaces, which tripped me up.