About ZXCTN equipment MCC monitoring, which of the following descriptions are correct

A.Each line side interface (NNI) of ZXCTN equipment should be configured with EMS VLAN, and each VLAN should be configured with proper EMS IP;

B.ZXCTN6300/6200 support L3 routing protocol (e.g. OSPF). In 10GE ring, EMS info is forwarded through L3, and two adjacent ports on one link belong to one VLAN domain and one IP network segment;

C.After ZXCTN6100 device is upgraded into agent version, it is recommended to use L3 monitoring mode.

D.EMS VLAN ID range is in 3001～4093, and these VLAN values are automatically shielded on T31 to prevent collision between EMS VLAN and encapsulation VLAN;