What is Marvin Management network?

With VXRAIL appliances, you will have 2 different portgroups for management. (initial and post configuration)

When ESXi is installed at the factory, it will come with a default portgroup called "Management Network". Usually, the vmk interface for this portgroup will have a IPv4 link local IP address assigned to it.

During the appliance configuration process, this portgroup will be renamed to "Marvin Management" (it is not actively used for day to day operations - and only needed to be around to be able to perform a factory reset process on the appliance), and new portgroup called "management network" will be created. vmk interface assigned to this portgroup will be assigned the IP address that you specified during the initial configuration process.

So if you are changing VLAN IDs for management network, we would recommend that you make this change for both Marvin and Management network (and for forget about vCenter network portgroup as well as all management traffic runs between VXRAIL manager / VC / LogInsight through it).