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 undoportswitch command to configure the Ethernet interfaces as Layer 3 interface

For switches in V200R003C00 and earlier versions:

Only Layer 2 Ethernet interfaces on the S5700-HI, S5710-EI, and S5710-HI 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 S5700-EI, S5700-HI, S5710-EI, S5710-HI,
S5720-EI like S5720-50X-EI-46S-AC, S5720-HI, S6700-EI, S6720-EI switch, and S6720S-EI 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.