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CLI-based Configuration Guide - Interface Management

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document provides the basic concepts, configuration procedures, and configuration examples of the interfaces supported by the device.
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Configuring a NULL Interface

Configuring a NULL Interface

A NULL interface is always Up once created automatically by the system. It does not forward packet but can be used to filter packet.

Context

A NULL0 interface is created automatically. The NULL0 interface is always Up and cannot forward packets. Any packets sent to the NULL0 interface are discarded. If the next hop of a static route to a network segment is a null interface, all the data packets destined for this network segment are discarded. Therefore, the packets that you want to filter out can be sent to the NULL0 interface directly without configuring the access control list.

For example, run the following static route configuration command to discard packets sent to the network segment of 192.168.0.0.

[Huawei] ip route-static 192.168.0.0 255.255.255.0 NULL 0

Pre-Configuration

Before configuring a NULL interface, complete the following task:

  • Powering on the device and performing self-check

Procedure

  1. Run system-view

    The system view is displayed.

  2. Run interface null 0

    The NULL interface view is displayed.

    The NULL interface stays in the Up state. It cannot forward data packets. You cannot configure an IP address for it or encapsulate it with protocols.

Verifying the Configuration

  • Run the display interface null [ 0 ] command to check the status of a null interface.
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Updated: 2019-03-06

Document ID: EDOC1100069331

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