display arp dynamic vlan

Function

The display arp dynamic vlan command displays dynamic Address Resolution Protocol (ARP) entries that a device has generated on a specified VLAN.

Format

display arp dynamic [ vlan vlan-id ]

Parameters

Parameter	Description	Value
vlan vlan-id	Displays the dynamic ARP entries that a device has generated on a specified VLAN. If this parameter is not specified, all dynamic ARP entries that a device has generated are displayed.	The value is an integer ranging from 1 to 4094.

Parameter

Description

Value

vlan vlan-id

Displays the dynamic ARP entries that a device has generated on a specified VLAN.

If this parameter is not specified, all dynamic ARP entries that a device has generated are displayed.

The value is an integer ranging from 1 to 4094.

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

To monitor dynamic ARP or locate a fault if dynamic ARP goes faulty on a device, run the display arp dynamic vlan command to view dynamic ARP entries. The display arp dynamic vlan command displays dynamic ARP entries that a device has generated. You can locate the fault based on the command output.

Example

# Display dynamic ARP entries that a device has generated on VLAN 10.

<sysname> display arp dynamic vlan 10

IP ADDRESS      MAC ADDRESS     EXPIRE(M) TYPE        INTERFACE   VPN-INSTANCE
                                          VLAN/CEVLAN                           
------------------------------------------------------------------------------  
172.16.1.1      0000-****-5f77            I -         Vlanif10                  
172.16.1.2      00e0-****-5e3c  20        D-0            GigabitEthernet 0/0/1                
                                           10/-                                 
172.16.1.3      0025-****-e8a6  14        D-0            GigabitEthernet 0/0/2                
                                           10/-                                 
172.16.1.4      00e0-****-c860  19        D-0            GigabitEthernet 0/0/3                
                                           10/-                                 
------------------------------------------------------------------------------  
Total:4         Dynamic:3       Static:0     Interface:1     Remote:0

**Table 1** Description of the **display arp dynamic vlan** command output
Item	Description
IP ADDRESS	IP address in an ARP entry.
MAC ADDRESS	MAC address in an ARP entry. If the field is Incomplete, the entry is a fake ARP entry. If a large number of ARP Miss messages are sent to the upper-layer software, the system resources will be exhausted in processing the ARP Miss messages. To resolve this problem, the system automatically generates ARP fake entries instead of ARP entries.
EXPIRE(M)	Remaining lifetime of an ARP entry, in minutes.
TYPE	Entry type and number of the slot that obtains the entry. The entry type contains 3 bits. The first bit can be as follows: I: Interface, indicating the MAC address of the interface D: Dynamic, indicating the dynamic entry obtained through the ARP packet S: Static, indicating the static entry obtained through static configuration R: Remote, indicating the ARP entry obtained through remote backup The second bit can only be F, indicating that the entry is reported to the routing module, the route to this IP address is calculated, and the entries in the FIB are correspondingly updated. NOTE: If the entry is not reported to the routing module, this field displays "-". For the ARP entry with the type as "I", this flag bit does not exist. The third bit indicates the number of the slot that obtains this entry. NOTE: For the ARP entry with the type as "I" or "S", this field displays "-".
VPN-INSTANCE	Name of the VPN instance to which the ARP entry belongs.
INTERFACE	Type and number of the interface on which the ARP entry is generated.
VLAN/CEVLAN	ID of the VLAN to which the ARP entry belongs.
PVC	Interface on which the permanent virtual channel (PVC) exists and the virtual path identifier (VPI)/virtual channel identifier (VCI).
Total	Total number of ARP entries.
Dynamic	Number of dynamic ARP entries.
Static	Number of static ARP entries.
Interface	Number of ARP entries on the interface.
Remote	Number of remote backup ARP entries