display arp track

Function

The display arp track command displays detailed information about the outbound interface changes in ARP entries learned by the VLANIF/VBDIF interface.

Format

display arp track

Parameters

None

Views

All views

Default Level

1: Monitoring level

Task Name and Operations

Task Name	Operations
arp	read

Usage Guidelines

Usage Scenario

When the outbound interface information in an ARP entry learned by a VLANIF/VBDIF interface changes, traffic is interrupted frequently and randomly. To quickly locate the fault, run the display arp track command to check records about the change of outbound interface information and check the time of change.

Prerequisites

ARP entries have been learned by the VLANIF/VBDIF interface, and the outbound interface information in an ARP entry changes.

Precautions

After the display arp track command is run, information about the change of ARP entries due to the following reasons will be displayed:

The VLANIF/VBDIF interface learns dynamic ARP entries, and the outbound interface is updated.
The outbound interface information in a short static ARP entry changes.
A dynamic ARP entry or a short static ARP entry is deleted.

Example

The actual command output varies according to the device. The command output here is only an example.

# Display the change of ARP entries.

<HUAWEI> display arp track
Operate Flags: M - Modify, D - Delete
------------------------------------------------------------------------------------
Op IP-Address      MAC-Address    VLAN/BD    Old-Port     New-Port     System-Time
------------------------------------------------------------------------------------
D  10.1.1.2        00e0-fc12-3456 BD11       GE0/1/1.9                 12-03 19:50:52
M  10.1.1.2        00e0-fc12-3456 BD11       GE0/1/1.9    GE0/1/1.8    12-03 14:49:17
M  10.1.1.2        00e0-fc12-3456 BD11       GE0/1/1.8    GE0/1/1.9    12-03 14:49:20
M  10.2.1.2        00e0-fc12-3456 11         GE0/1/9      GE0/1/10      12-03 14:51:12
M  10.2.1.2        00e0-fc12-3456 11         GE0/1/10      GE0/1/9      12-03 14:51:17

**Table 1** Description of the **display arp track** command output
Item	Description
Operate Flags	Operation identifier, which can be: M: Modify, indicating that the outbound interface information changes. D: Deletion, indicating that the ARP entry is deleted.
Op	Operation identifier, which can be: M: Modify, indicating that the outbound interface information changes. D: Deletion, indicating that the ARP entry is deleted.
IP-Address	IP address in an ARP entry.
MAC-Address	MAC address in an ARP entry.
VLAN/BD	ID of the BD to which the VBDIF interface belongs.
Old-Port	Previous outbound interface in an ARP entry.
New-Port	New outbound interface in an ARP entry.
System-Time	System time when the outbound interface information changes.