Assume that the IP address of GE0/0/0 on R1 is 10.

ospf 1 → [R1]

area 0 → [R1-ospf-1]

network 10.0.12.1 0.0.0.0 → [R1-ospf-1-area-0.0.0.0]

ospf enable 1 area 0 → [R1-GE0/0/0]

Huawei devices support two common ways to enable OSPF on an interface.

The first method is the process-based method. In this method, you first enter system view, then enter the OSPF process view using ospf 1, so this command belongs to [R1]. After that, you enter the area view using area 0, so this command belongs to [R1-ospf-1] . Inside the area view, the command network 10.0.12.1 0.0.0.0 is used to match the interface with IP address 10.0.12.1, so it belongs to [R1-ospf-1-area-0.0.0.0].

The second method is the interface-based method. In this method, OSPF is enabled directly under the interface using ospf enable 1 area 0, so this command belongs to [R1-GE0/0/0].

This question tests the difference between global OSPF process configuration and direct interface OSPF enabling, both of which are standard Huawei OSPF configuration methods.