HP HPE FlexNetwork 7500 series, Configuration Manual

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Configuring DCN
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.
Basic concepts
A DCN network includes the following basic elements:
•
NE —A network device managed by the NMS on the DCN network.
•
GNE —The NE that is directly connected to the NMS. The NSM communicates with the GNE at
the network layer or application layer and manages the NEs through the GNE.
•
NE table —Stores the NE ID-to-NE IP mappings for each NE in the DCN domain. After DCN is
enabled, an NE encapsulates its NE ID and NE IP in a Type-10 Opaque LSA. It floods the LSA
to synchronize the mappings with other NEs in the DCN domain. The NE IP in the Type-10
Opaque LSA might be inconsistent with the NE's router ID when DCN is enabled on an OSPF
network. Devices from other vendors will fail to identify the NE. To avoid this problem, make
sure the following requirements are met:

Change the router ID by modifying the NE IP. Do not change the default IP address of the
DCN's loopback interface.

Do not associate other loopback interfaces to the DCN VPN instance.
Basic features
GNE
The GNE allows the NMS to access NEs on the DCN network. The GNE provides the NE ID-to-NE
IP mappings of all NEs for the Telnet users to access the target NE remotely.
NE search
The NE search feature allows the NMS to search for all NEs that are connected to the GNE. With this
feature, the GNE can report information about all NEs in its NE table and the GNE itself to the NMS.
Automatic report
The automatic report feature enables the GNE to automatically report online or offline events of NEs
to the NMS.
DCN configuration task list
Tasks at a glance
(Required.) Enabling DCN
(Optional.) Configuring the NE ID and NE IP
(Required.) Configuring DCN VPN