Overview
Data communication network (DCN) is built for the network management system (NMS) to implement operation, administration, and maintenance (OAM) on the network elements (NEs).
On large-scaled networks with DCN configured, the NMS remotely manages and controls all NEs through the gateway network element (GNE), which reduces operation and maintenance costs.
On the DCN network, all NEs must operate in Area 0 of OSPF process 65535.