arp learning dhcp-trigger

Function

The arp learning dhcp-trigger command enables ARP learning triggered by DHCP.

The undo arp learning dhcp-trigger command disables ARP learning triggered by DHCP.

By default, ARP learning triggered by DHCP is disabled.

Format

arp learning dhcp-trigger

undo arp learning dhcp-trigger

Parameters

None

Views

VLANIF interface view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

When many DHCP users connect to a network device, the device needs to learn and maintain many ARP entries. This affects device performance.

To address this issue, configure ARP learning triggered by DHCP on the gateway. When the DHCP server allocates an IP address for a user, the gateway generates an ARP entry for the user based on the DHCP ACK packet received on the VLANIF interface.

Precautions

Before using this command, ensure that DHCP is enabled using the dhcp enable command.

When both VRRP and DHCP relay are configured on the network, neither the dhcp snooping enable command nor the arp learning dhcp-trigger command can be configured on the VRRP master and backup devices.

Example

# Enable ARP learning triggered by DHCP on VLANIF 100.

<HUAWEI> system-view
[HUAWEI] vlan batch 100
[HUAWEI] dhcp enable
[HUAWEI] interface vlanif 100
[HUAWEI-Vlanif100] arp learning dhcp-trigger