MAD can be configured on layer 2 interface

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MAD can be only configured on Layer 2 interfaces and MAD packets are BPDU packets.
Because the Management interface is a Layer 3 interface andcannot work at Layer 2, MAD cannot be configured.

Other related questions:
How do AR routers support sub-interfaces
AR routers support sub-interfaces as follows: Only Layer-3 Ethernet interfaces support the configuration of sub-interfaces. AR routers of different models and versions have no differences in the support of sub-interfaces.

How to configure a Layer 2 interface as a Layer 3 interface on a switch
By default, Ethernet interfaces on switches work as Layer 2 interfaces.Run the undo portswitch command to configure the Ethernet interfaces as Layer 3 interfaces. For switches in V200R003C00 and earlier versions: Only Layer 2 Ethernet interfaces on the S5700HI, S5710EI, and S5710HI can be configured as Layer 3 interfaces. After an Ethernet interface is configured as a Layer 3 interface, the interface cannot be configured with an IP address. For switches in V200R005C00 and later versions: Only Layer 2 Ethernet interfaces on the S5700HI, S5710EI, S5710HI, S5700EI, S5720EI, S5720HI, S6700EI, and S6720EI can be configured as Layer 3 interfaces. After an Ethernet interface is configured as a Layer 3 interface, the interface can be configured with an IP address.

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