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FITAP V200R010C00 Command Reference

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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).
arp learning strict (system view)

arp learning strict (system view)

Function

The arp learning strict command enables strict ARP learning.

The undo arp learning strict command restores the default setting.

By default, strict ARP learning is disabled.

Format

arp learning strict

undo arp learning strict

Parameters

None

Views

System view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

If many users send a large number of ARP packets to a device at the same time, or attackers send bogus ARP packets to the device, the following problems occur:
  • Many CPU resources are consumed to process a large number of ARP packets. The device learns many invalid ARP entries, which exhaust ARP entry resources and prevent the device from learning ARP entries for ARP packets from authorized users. Consequently, communication of authorized users is interrupted.
  • Bogus ARP packets modify ARP entries on the device. As a result, authorized users cannot communicate.

To avoid the preceding problems, enable strict ARP learning on the gateway. This function indicates that the device learns only ARP entries for ARP Reply packets in response to ARP Request packets sent by itself. In this way, the device can defend against most ARP attacks.

Precautions

The configuration on an interface takes precedence over the global configuration.

Example

# Enable strict ARP learning.

<Huawei> system-view
[Huawei] arp learning strict
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Updated: 2019-05-14

Document ID: EDOC1100064353

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