Contents

Configuring DCN·· 1

About DCN· 1

Basic concepts· 1

GNE· 1

NE search· 1

Automatic report 1

DCN tasks at a glance· 1

Enabling DCN· 2

Configuring the NE ID and NE IP· 2

Enabling the automatic report feature· 3

Configuring the LLDP features· 3

Configuring the source MAC address of LLDP frames· 3

Advertising the LLDP management address· 3

Enabling the device to generate ARP entries for received management address LLDP TLVs· 4

Display and maintenance commands for DCN· 4

DCN configuration examples· 5

 

Configuring DCN

About DCN

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

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, change the router ID by modifying the NE IP and do not change the default IP address of the DCN's loopback interface.

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 tasks at a glance

To configure DCN, perform the following tasks:

1.     Enabling DCN

2.     (Optional.) Configuring the NE ID and NE IP

3.     (Optional.) Enabling the automatic report feature

4.     Configuring the LLDP features

a.     Configuring the source MAC address of LLDP frames

b.     Advertising the LLDP management address

c.     Enabling the device to generate ARP entries for received management address LLDP TLVs

Enabling DCN

About this task

After DCN is enabled, the device assigns an NE IP to the loopback interface with the largest interface number and uses the interface for communication. The NE IP is specified as the management address and advertised in an LLDP frame. For more information about LLDP, see LLDP configuration in Layer 2—LAN Switching Configuration Guide.

Procedure

1.     Enter system view.

system-view

2.     Enable DCN and enter DCN view.

dcn

By default, DCN is disabled.

Configuring the NE ID and NE IP

About this task

Typically an NE automatically generates an NE IP according to its NE ID. The automatically generated NE IP changes when the NE ID changes. When you replan your network or an NE ID conflict occurs, you can manually configure the NE ID and NE IP. The manually configured NE IP does not change when the NE ID changes.

Procedure

1.     Enter system view.

system-view

2.     Enter DCN view.

dcn

3.     Configure the NE ID.

ne-id id-number

By default, the NE ID is automatically generated by using the 24 low-order bits of the bridge MAC address.

4.     Configure the NE IP.

ne-ip ip-address { mask-length | mask }

By default, the NE IP is automatically generated by using 129 as the eight high-order bits and the NE ID as the rest 16 bits. The mask length is 32.

Enabling the automatic report feature

Restrictions and guidelines

Perform this task only on GNE to enable it to automatically report online or offline events of NEs to the NMS.

Procedure

1.     Enter system view.

system-view

2.     Enter DCN view.

dcn

3.     Enable the automatic report feature.

auto-report

By default, the automatic report feature is disabled.

Configuring the LLDP features

Configuring the source MAC address of LLDP frames

	NOTE: This configuration task is required for certain device models.

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About this task

Perform this task to configure the MAC address of the VLAN interface as the source MAC address of LLDP frames. For more information about Dot1q termination, see VLAN termination configuration in Layer 2—LAN Switching Configuration Guide. For more information about LLDP, see LLDP configuration in Layer 2—LAN Switching Configuration Guide.

Procedure

1.     Enter system view.

system-view

2.     Enter  interface view.

interface interface-type interface-number

3.     Configure the MAC address of the Dot1q termination-enabled VLAN interface as the source MAC address of LLDP frames.

lldp source-mac vlan vlan-id

By default, the MAC address of the current Ethernet interface is specified as the source MAC address of LLDP frames.

For more information about this command, see LLDP commands in Layer 2—LAN Switching Command Reference.

Advertising the LLDP management address

About this task

An NE on the DCN network learns the MAC address of its neighbor through LLDP. Perform this task to enable an NE to advertise the IP address of the specified loopback interface (management address) for ARP entry learning. For more information about LLDP, see LLDP configuration in Layer 2—LAN Switching Configuration Guide.

Procedure

1.     Enter system view.

system-view

2.     Enter interface view.

interface interface-type interface-number

3.     Advertise the LLDP management address.

lldp tlv-enable basic-tlv management-address-tlv [ ip-address | interface loopback interface-number ]

By default, the LLDP management address is not advertised.

For more information about this command, see LLDP commands in Layer 2—LAN Switching Command Reference.

Enabling the device to generate ARP entries for received management address LLDP TLVs

About this task

This feature enables the device to generate an ARP entry for a received LLDP frame that meets the following requirements:

·     The LLDP frame carries a management address TLV.

·     The management address TLV contains an IPv4 address.

The generated ARP entry contains the management address and the source MAC address of the frame. For more information about LLDP, see LLDP configuration in Layer 2—LAN Switching Configuration Guide.

Procedure

1.     Enter system view.

system-view

2.     Enter interface view.

interface interface-type interface-number

3.     Enable the device to generate an ARP entry when receiving a management address LLDP TLV.

lldp management-address arp-learning vlan vlan-id

By default, the device does not generate an ARP entry when receiving a management address LLDP TLV.

The vlan-id argument specifies the VLAN ID of a VLAN interface.

For more information about this command, see LLDP commands in Layer 2—LAN Switching Configuration Guide.

Display and maintenance commands for DCN

Execute the display commands in any view.

 

Task	Command
Display the brief DCN information.	display dcn
Display information about all online NEs on the DCN network.	display dcn ne-info

 

DCN configuration examples