display arp vpn-instance

Function

The display arp vpn-instance command displays ARP entries of a specified VPN instance.

Format

display arp vpn-instance vpn-instance-name [ dynamic | static ]

Parameters

Parameter	Description	Value
vpn-instance-name	Specifies the VPN instance name.	The value must be an existing VPN instance name.
dynamic	Displays dynamic ARP entries.	-
static	Displays static ARP entries.	-

Views

All views

Default Level

1: Monitoring level

Usage Guidelines

You can run the display arp vpn-instance command to check ARP entries of a specified VPN instance.

Example

# Check all ARP entries learned by the VPN instance r1.

<HUAWEI> display arp vpn-instance r1
IP ADDRESS      MAC ADDRESS     EXPIRE(M) TYPE        INTERFACE   VPN-INSTANCE
                                          VLAN/CEVLAN(SIP/DIP)
------------------------------------------------------------------------------
192.168.1.11    0000-0a41-0201            I -         Vlanif10       r1
192.168.1.1     0000-0a41-0200  12        D-0         Vlanif10       r1
------------------------------------------------------------------------------
Total:2         Dynamic:1       Static:0    Interface:1

**Table 1** Description of the **display arp vpn-instance** command output
Item	Description
IP ADDRESS	IP address in the ARP entry.
MAC ADDRESS	MAC address in the ARP entry. NOTE: If the value of MAC ADDRESS is Incomplete, the current ARP entry is a temporary one. When IP packets trigger ARP Miss messages, the device generates temporary ARP entries and sends ARP Request packets to the destination network segment. When a temporary ARP entry is not aged out, before receiving an ARP Reply packet, the device discards the IP packets matching the temporary ARP entry, and no ARP Miss message is triggered. When a temporary ARP entry is not aged out, after receiving the ARP Reply packet, the device generates a correct ARP entry to replace the temporary entry. After the temporary ARP entry is aged out, the device deletes this entry. You can run the arp-fake expire-time command to adjust the aging time of the temporary ARP entry.
EXPIRE(M)	Remaining lifetime of the ARP entry, in minutes. If the remaining lifetime is 0, ARP entry aging probe is to be started. The ARP entry aging time depends on the number of configured aging probe attempts and the number of ARP entries that need to be aged.
TYPE	Entry type and ID of the slot that obtains the entry. The entry type contains 3 bits. The first bit can be any of the following: I: Interface, indicating the MAC address of the interface D: Dynamic, indicating a dynamic ARP entry S: Static, indicating a static ARP entry The second bit can only be F, indicating that the ARP entry has been reported to the routing module, the route to this IP address has been calculated, and the entry in the FIB table has been updated. 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. NOTE: VLANIF interface and sub-interfaces for VLAN tag termination (including QinQ termination sub-interfaces and Dolt1q termination sub-interfaces) on devices report learned ARP entries to the routing module to generate 32-bit host routes (routes destined for complete host addresses). The host routes are accurate and can be used for packet forwarding. Because the forwarding model of the two types of interfaces requires accurate forwarding paths. However, the outbound interfaces of VLANIF interface routes are VLANIF interfaces. VLANIF interfaces are virtual interfaces that may correspond to multiple physical interfaces, and as a result, such routes cannot be used for packet forwarding. Therefore, the VLANIF interfaces report learned ARP entries to the routing module to generate host routes. As for sub-interfaces for VLAN tag termination, they may correspond to multiple VLANs, and the forwarding model requires that packets be sent to a specified VLAN. Therefore, the sub-interfaces for VLAN tag termination also report learned ARP entries to the routing module to generate host routes. The third bit indicates the ID of the slot that obtains the entry. For the ARP entry with the type as I or S, this field displays -.
INTERFACE	Type and number of the interface that has learned ARP entries.
VPN-INSTANCE	Name of the VPN instance to which the ARP entry belongs. To configure the VPN instance name, run the ip vpn-instance command.
VLAN/CEVLAN	ID of the VLAN/CEVLAN to which the ARP entry belongs. NOTE: Only the S5720-EI, S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support the CEVLAN parameter. In a VXLAN network, SIP and DIP indicate the source and destination IP addresses of a tunnel. NOTE: Only the S5720-HI, S5730-HI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720S-EI, S6730-H, S6730S-H, S6730-S, and S6730S-S support SIP/DIP.
Total	Total number of ARP entries.
Dynamic	Number of dynamic ARP entries.
Static	Number of static ARP entries.
Interface	Number of ARP entries for the interface.