Why the NDP/NTDP configuration of a switch Eth-Trunk member port cannot be deleted

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It has two situations:

For a physical port, no configuration is performed before the Eth-Trunk is added. After ntdp enable is configured, ntdp enable is displayed for buildrun. If undo ntdp enable is configured, undo ntdp enable is displayed. See the following information:
interface GigabitEthernet0/0/9
#interface GigabitEthernet0/0/9
ntdp enable
#interface GigabitEthernet0/0/9
undo ntdp enable
#The cause is that there are three states (not configured, enabled, disabled) for the NDP/NTDP in the V100R005 version. Therefore, if the enabled or disabled state is configured, the value of buildrun is written.

After the physical port is added to the Eth-Trunk1, the NDP/NTDP configuration cannot be deleted. See the following information:
interface GigabitEthernet0/0/9
eth-trunk 1
undo ntdp enable
undo ndp enable The cause is that the physical port can be added to the Eth-Trunk1 only after the NDP/NTDP is disabled, and after the addition the NDP/NTDP cannot be enabled.

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