Hi aswokei,  I'm not sure I understand your question. Please elaborate/clarify if you could.  If you mean GUI management: then yes, only via the mgmt ports. You can also monitor / manage a Unity system with other tools remotely such as UEMCLI (Unity CLI), RestAPI, Unisphere Central, and a few more tools. On the service ports, IPMI is also available for access but this is something else (search the Unity support pages for IPMI tool).  In any case: the other network interfaces (for iSCSI, NAS, etc) cannot be used to manage the system.  You also say: "The Unity has designated management ports on some of the SPs". This is not correct entirely. Not "some", but all. Unity has two SPs, and both have a management interface, however only the primary SP provides access at any given time.  Hope this helps  Andre @ Dell EMC
The Unity has designated management ports on some of the SPs, but I was wondering if it's possible to manage the Unity inband--using the same ports that are used for storage.  Is that possible?  What are the management options?  Does it have to out of band?  I couldn't find anything useful in the manuals.  Thank you!
Are the designated management ports the only way you can manage the Unity?