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Fit AP V200R010C00 Command Reference

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arp learning strict (interface view)

arp learning strict (interface view)

Function

The arp learning strict command enables strict ARP learning the VLANIF interface.

The undo arp learning strict command restores the global configuration on the VLANIF interface.

By default, strict ARP learning is disabled on the VLANIF interface.

Format

arp learning strict { force-enable | force-disable | trust }

undo arp learning strict

Parameters

Parameter Description Value
force-enable Indicates that strict ARP learning is enabled. -
force-disable Indicates that strict ARP learning is disabled. -
trust Indicates that the configuration of strict ARP entry learning is the same as the global configuration. -

Views

VLANIF interface 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.

When ARP attacks occur on many interfaces of the device, you can run the arp learning strict command to enable strict ARP learning globally.

Example

# Enable strict ARP learning on VLANIF 100.
<Huawei> system-view
[Huawei] interface vlanif 100
[Huawei-Vlanif100] arp learning strict force-enable
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Updated: 2019-07-18

Document ID: EDOC1100064353

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