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CX11x, CX31x, CX710 (Earlier Than V6.03), and CX91x Series Switch Modules V100R001C10 Configuration Guide 12

The documents describe the configuration of various services supported by the CX11x&CX31x&CX91x series switch modules The description covers configuration examples and function configurations.
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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Configuring a Logical Interface

Configuring a Logical Interface

This section describes the procedures for configuring a logical interface.

Configuring a Loopback Interface

The loopback interface is always Up to ensure network reliability.

Context

The loopback interface has the following features:

  • The loopback interface is always Up and has the loopback feature.
  • The loopback interface can be configured with the mask of all 1s.

Based on the preceding features, the loopback interface has the following applications.

  • The IP address of a loopback interface is specified as the source address of packets to improve network reliability.
  • When no Router ID is configured for dynamic routing protocols, the maximum IP address of the loopback interface is configured as the router ID automatically.
  • The loopback interface is configured as the source interface to send boarder gateway protocol (BGP) packets to ensure that the BGP session functions correctly when the physical interface is faulty.
  • The loopback interface can be configured with the mask of 255.255.255.255 to save IP address resources.
Pre-Configuration

Before configuring a loopback 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 loopback loopback-number

    A loopback interface is created and the loopback interface view is displayed.

    You can create or delete loopback interface dynamically. After a loopback interface is created, the link-layer protocol is always up unless the loopback interface is deleted.

  3. Run:

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

    The IP address of the loopback interface is configured.

  4. Run:

    commit

    Commit the configuration.

Checking the Configuration
  • Run the display interface loopback [ loopback-number ] command to check the status of a loopback 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 192.101.0.0.

[~HUAWEI] ip route-static 192.101.0.0 255.255.0.0 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.

Checking the Configuration
  • Run the display interface null [ 0 ] command to check the status of a null interface.
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Updated: 2019-08-09

Document ID: EDOC1000041694

Views: 57902

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