dcn mode vlan

Function

The dcn mode vlan command enables DCN communication through sub-interfaces numbered 4094.

The undo dcn mode vlan command disables DCN communication through sub-interfaces numbered 4094.

This command varies in transport and router modes. For detailed differences, see Differences Between Commands in Transport and Router Modes. This topic describes the command configuration in router mode.

By default, whether the DCN function is enabled on the sub-interface numbered 4094 depends on the interface board type and the number of interfaces on the board.

Format

dcn mode vlan

undo dcn mode vlan

Parameters

None

Views

100GE interface view, 10GE interface view, 40GE interface view, GE optical interface view, GE electrical interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
dcn	write

Usage Guidelines

Usage Scenario

DCN communication uses the Huawei proprietary protocol. Therefore, Huawei NEs cannot communicate with non-Huawei NEs. To implement DCN communication between Huawei NEs and non-Huawei NEs, run the dcn mode vlan command to enable DCN communication through sub-interfaces 4094. After the command is run, each NE automatically creates a sub-interface numbered 4094 for DCN communication.

After the sub-interface numbered 4094 is configured, it is automatically associated with VLAN 4094.

Prerequisites

DCN has been enabled globally using the dcn command in the system view.DCN communication through sub-interface 4094 can be enabled on this NE through a license, or the NE can learn this function through a neighbor NE.

Configuration Impact

If the device supports DCN communication through sub-interface 4094 and DCN is enabled globally, LLDP is automatically enabled after the device is restarted in CFG mode.

Precautions

In VS mode, this command is supported only by the admin VS.

In most cases, sub-interface 4094 is automatically created after the dcn mode vlan command is run on an interface. This sub-interface cannot be directly deleted.

If a sub-interface numbered 4094 has been created on an interface or the sub-interface occupies the VLAN numbered 4094, the dcn mode vlan command fails to be run.

When the undo dcn mode vlan command is run on an interface, the sub-interface numbered 4094 that is automatically created is deleted.

However, if a sub-interface numbered 4094 is created using the dcn mode vlan command on an interface that supports the flexible Ethernet (FlexE) mode and then the flexethmode enable port command is run to switch the working mode from the standard Ethernet mode to the FlexE mode, the sub-interface numbered 4094 is deleted. In this case, to continue to use DCN communication through sub-interfaces numbered 4094, you need to run the flexeth group command on a FlexE service interface split from the original interface to configure bandwidth for the FlexE service interface, and then run the dcn mode vlan command.

Configuring a timeslot is implemented after a FlexE logical interface is created. Therefore, the DCN communication through sub-interfaces numbered 4094 function is not automatically enabled for the logical interface. To resolve this problem, enable the DCN communication through sub-interfaces numbered 4094 function on the interface where a timeslot has been configured.

Example

# Enable DCN communication through sub-interfaces 4094.

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/0
[*HUAWEI-GigabitEthernet0/1/0] dcn mode vlan