Logical Interface Configuration

This section describes how to configure logical interfaces. Logical interfaces are manually configured interfaces, which are used to exchange data. Logical interfaces do not exist physically.

Usage Scenario

For usage scenarios of logical interfaces, see "Logical Interface" in NetEngine 8000 F-Feature Description-Interface Management.

**Table 1** Logical interface list
Feature	Interface Name	Configuration Guide
System management	DCN serial interface	This interface is automatically created by the system.
Interface management	Virtual Ethernet (VE) interface	Creating an L2VE Interface Creating an L3VE Interface
Interface management	Global VE interface	Creating a Global-VE interface
Interface management	Loopback interface	Creating a Loopback Interface and Configuring Its IP Address
Interface management	Null0 interface	Entering the NULL Interface View
LAN access and MAN access	Ethernet sub-interface	Configuring Ethernet Sub-interfaces to Support Communication Between VLANs
LAN access and MAN access	Eth-Trunk interface	Eth-Trunk Interface Configuration
LAN access and MAN access	VLANIF interface	Configuring Layer 3 Communication Between VLANIF Interfaces
MPLS	Tunnel interface	MPLS TE Configuration

Pre-configuration Tasks

Before configuring logical interfaces, connect interfaces and set their physical parameters to ensure that these interfaces are physically up.

Creating a Global-VE interface: Global-VE interfaces are independent of boards. You can create Global-VE interfaces only if the router is powered on.

Configuring a VLAN Channelized Sub-Interface: This section describes how to configure a VLAN channelized sub-interface.

Creating a Loopback Interface and Configuring an IP Address for It: IP addresses need to be configured for loopback interfaces that are always up so that these interfaces can be used to communicate with other devices.

Entering the NULL Interface View: The system automatically creates a NULL0 interface. The NULL interface is used for preventing routing loops and filtering traffic.

Verifying the Configuration: After the configuration is completed on the Global-VE interface, FlexE interface license, FlexE interface, loopback interface, and Null interface, check the configurations.