arp fast-reply disable

Function

The arp fast-reply disable command disables the ARP fast reply function.

The undo arp fast-reply disable command enables the ARP fast reply function.

By default, the ARP fast reply function is enabled.

Format

arp fast-reply disable

undo arp fast-reply disable

Parameters

None

Views

Slot view

Default Level

3: Management level

Task Name and Operations

Task Name	Operations
forwarding	write

Usage Guidelines

Usage Scenario

If the peer device does not respond to an ARP request, the ARP fast reply function must be disabled in the corresponding slot.

To protect a device against ARP request packet attacks and reduce CPU resource consumption, run the arp fast-reply enable command.

After a device on which the ARP fast reply function is enabled receives an ARP request packet that requests the MAC address of a local interface, if the local interface has learned the peer ARP information, the system does not send the ARP request packet to the CPU but replies using hardware; if the local interface has not learned the peer ARP information, the system sends the ARP request packet to the CPU.

In VS mode, this command is supported only by the admin VS.

Example

# Disable the ARP fast reply function in slot 1.

<HUAWEI> system-view
[~HUAWEI] slot 1
[~HUAWEI-slot-1] arp fast-reply disable