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Fat AP and Cloud AP 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 detect-mode unicast

arp detect-mode unicast

Function

The arp detect-mode unicast command configures an interface to send ARP aging probe packets in unicast mode.

The undo arp detect-mode unicast command restores the default configuration of detection modes on an interface.

By default, an interface broadcasts ARP aging probe packets.

Format

arp detect-mode unicast

undo arp detect-mode unicast

Parameters

None

Views

VLANIF interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

Before an ARP entry is aged, the interface periodically sends ARP aging probe packets at a set interval to update ARP entries. The device deletes an ARP entry if it does not receive a reply after a specified number of probes. The aging probe packet can be a unicast or broadcast packet.

When a non-Huawei device connected to a Huawei wireless access point receives an ARP aging probe packet whose destination MAC address is a broadcast address, the non-Huawei device checks the ARP table. If the mapping between the IP address and the MAC address of the Huawei wireless access point exists in the ARP table, the non-Huawei device discards the ARP aging probe packet. Then the Huawei wireless access point cannot receive a response and deletes the corresponding ARP entry. As a result, traffic from the non-Huawei device cannot be forwarded. Therefore, when a non-Huawei device is connected to a Huawei wireless access point, configure the Huawei switch to unicast ARP aging probe packets. The non-Huawei device needs to respond to the ARP aging probe packet.

Precautions

If the IP address of the peer device remains the same but the MAC address changes frequently, it is recommended that you configure ARP aging probe packets to be broadcast.

When the MAC address of the peer device remains the same, and the bandwidth of the network is insufficient, it is recommended that you set the interface to send ARP aging probe packets in unicast mode.

Example

# Configure an interface to send ARP aging probe packets in unicast mode.

<Huawei> system-view
[Huawei] interface vlanif 10
[Huawei-Vlanif10] arp detect-mode unicast
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Updated: 2019-11-21

Document ID: EDOC1100064352

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