arp detect-mode unicast

Function

The arp detect-mode unicast command configures an interface to send Address Resolution Protocol (ARP) aging probe messages in unicast mode.

The undo arp detect-mode unicast command restores the default configuration.

By default, an interface sends the last ARP aging probe message in broadcast mode and the rest ARP aging probe messages in unicast mode.

Format

arp detect-mode unicast

undo arp detect-mode unicast

Parameters

None

Views

Layer 2 100GE interface view, 100ge sub-interface view, 100GE interface view, Layer 2 10GE interface view, 10GE sub-interface view, 10GE interface view, 200GE sub-interface view, 25GE-L2 view, 25GE sub-interface view, 25GE interface view, 400GE-L2 view, 400GE sub-interface view, 400GE interface view, Layer 2 40GE interface view, 40GE sub-interface view, 40GE interface view, Layer 2 50GE interface view, 50GE sub-interface view, 50GE interface view, Eth-Trunk sub-interface view, Eth-Trunk interface view, FlexE interface view, Layer 2 GE interface view, GE optical interface view, GE sub-interface view, GE interface view, GE electrical interface view, GMPLS-UNI interface view, Global VE sub-interface view, Global VE interface view, PW-VE sub-interface view, PW-VE interface view, VBDIF interface view, VE sub-interface view, VE interface view, VLANIF interface view, Management interface view

Default Level

2: Configuration level

Task Name and Operations

Task Name	Operations
arp	write

Usage Guidelines

Usage Scenario

Before aging ARP entries, an interface sends ARP aging probe messages at a specified aging probe interval. If responses are received, the device updates ARP entries on the interface. If no response is received for some ARP entries within a specified interval, the device ages these ARP entries. An aging probe message can be unicast or broadcast. To configure an interface to send aging probe messages in unicast mode, run the arp detect-mode unicast command.

Precautions

If the IP address of the peer device remains the same but the MAC address changes frequently, configuring an interface to send ARP aging probe messages in broadcast mode is recommended.

If the MAC address of the peer device remains the same, the network bandwidth is insufficient, and the aging time of ARP entries is set to a small value, configuring an interface to send ARP aging probe messages in unicast mode is recommended.

Example

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

<HUAWEI> system-view
[~HUAWEI] interface GigabitEthernet 0/1/1
[~HUAWEI-GigabitEthernet0/1/1] arp detect-mode unicast