Who can explain the following configuration? (Huawei switch)

Port default VLAN1; The default vlan is vlan 1.

Port trunking is allowed through VLAN 3113 3996 3999; Allow vlan 3 1 13 3996 3999 to pass.

Bpdu enabled; Allow bpdu

Qinq VLAN- conversion enabled; Qinq mode allows

Port VLAN- stack vlan 1 to 1920 push vlan 3 1 13 priority-inheritance; 1- 1920 inner layer uses 3 1 13 outer layer.

Port VLAN- mapping external -vlan 3999 mapping-external -vlan 3999 priority-inheritance; The inner layer of 3999 uses the outer layer of 3999.

Port VLAN- mapping external -vlan 3996 mapping-external -vlan 3996 priority-inheritance; The inner layer of 3996 uses the outer layer of 3996.

Ntdp enabled; Ntdp allows

Ndp enabled; Ndp authority