Dynamic ARP entry check disables a device from supporting dynamic ARP entries with multicast MAC addresses. The device cannot learn dynamic ARP entries containing multicast MAC addresses. You cannot manually add static ARP entries that contain multicast MAC addresses.

When dynamic ARP entry check is disabled, ARP entries containing multicast MAC addresses are supported. The device can learn dynamic ARP entries containing multicast MAC addresses obtained from the ARP packets sourced from a unicast MAC address. You can also manually add static ARP entries containing multicast MAC addresses.

Examples

# Enable dynamic ARP entry check.

<Sysname> system-view

[Sysname] arp check enable

arp check log enable

Use arp check log enable to enable the ARP logging feature.

Use undo arp check log enable to disable the ARP logging feature.

Syntax

arp check log enable

undo arp check log enable

Default

ARP logging is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

This feature enables a device to log ARP events when ARP cannot resolve IP addresses correctly. The device can log the following ARP events:

· On a proxy ARP-disabled interface, the target IP address of a received ARP packet is not one of the following IP addresses:

¡ The IP address of the receiving interface.

¡ The virtual IP address of the VRRP group.

· The sender IP address of a received ARP reply conflicts with one of the following IP addresses:

¡ The IP address of the receiving interface.

¡ The virtual IP address of the VRRP group.

The device sends ARP log messages to the information center. You can use the info-center source command to specify the log output rules for the information center. For more information about information center, see Network Management and Monitoring Configuration Guide.

The device can generate a large number of ARP logs. To conserve system resources, enable ARP logging only when you are auditing or troubleshooting ARP events.

Examples

# Enable ARP logging.

<Sysname> system-view

[Sysname] arp check log enable

arp max-learning-num

Use arp max-learning-num to set the maximum number of dynamic ARP entries that an interface can learn.

Use undo arp max-learning-num to restore the default.

Syntax

arp max-learning-num max-number [ alarm alarm-threshold ]

undo arp max-learning-num

Default

The maximum number of dynamic ARP entries that an interface can learn depends on the ARP table capacity set by using the hardware-resource switch-mode command. For information about the hardware-resource switch-mode command, see Fundamentals Command Reference.

Views

Layer 2 Ethernet interface view

Layer 2 aggregate interface view

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Layer 3 aggregate interface view

Layer 3 aggregate subinterface view

VXLAN VSI interface view

VLAN interface view

Predefined user roles

network-admin

Parameters

max-number: Specifies the maximum number of dynamic ARP entries for an interface. The value range for this argument is 0 to N. The value for N depends on the ARP table capacity.

alarm alarm-threshold: Specifies an alarm threshold for dynamic ARP learning, in percentage. The value range for the alarm-threshold argument is 1 to 100. The device generates a log message when the number of dynamic ARP entries learned on an interface reaches the value calculated by using the formula: (max-number × alarm-threshold)/100. If you do not specify the alarm threshold, the device does not generate log messages.

Usage guidelines

An interface can dynamically learn ARP entries. To prevent an interface from holding too many ARP entries, you can set the maximum number of dynamic ARP entries that the interface can learn. When the maximum number is reached, the interface stops learning ARP entries.

When the number argument is set to 0, the interface is disabled from learning dynamic ARP entries.

Examples

# Specify VLAN-interface 40 to learn a maximum of 10 dynamic ARP entries.

<Sysname> system-view

[Sysname] interface vlan-interface 40

[Sysname-Vlan-interface40] arp max-learning-num 10

# Specify Ten-GigabitEthernet 1/0/1 to learn a maximum of 10 dynamic ARP entries.

<Sysname> system-view

[Sysname] interface ten-gigabitethernet 1/0/1

[Sysname-Ten-GigabitEthernet1/0/1] arp max-learning-num 10

# Specify Layer 2 aggregate interface Bridge-Aggregation 1 to learn a maximum of 10 dynamic ARP entries.

<Sysname> system-view

[Sysname] interface bridge-aggregation 1

[Sysname-Bridge-Aggregation1] arp max-learning-num 10

# Specify Layer 3 aggregate interface Route-Aggregation 1 to learn a maximum of 10 dynamic ARP entries.

<Sysname> system-view

[Sysname] interface route-aggregation 1

[Sysname-Route-Aggregation1] arp max-learning-num 10

arp max-learning-number

Use arp max-learning-number to set the maximum number of dynamic ARP entries that a device can learn.

Use undo arp max-learning-number to restore the default.

Syntax

arp max-learning-number max-number slot slot-number

undo arp max-learning-number slot slot-number

Default

The maximum number of dynamic ARP entries that a device can learn depends on the ARP table capacity set by using the hardware-resource switch-mode command. For information about the hardware-resource switch-mode command, see Fundamentals Command Reference.

Views

System view

Predefined user roles

network-admin

Parameters

max-number: Specifies the maximum number of dynamic ARP entries for a device. The value range for this argument is 0 to N. The value for N depends on the ARP table capacity.

slot slot-number: Specifies an IRF member device by its member ID.

Usage guidelines

A device can dynamically learn ARP entries. To prevent a device from holding too many ARP entries, you can set the maximum number of dynamic ARP entries that the device can learn. When the maximum number is reached, the device stops learning ARP entries.

When the number argument is set to 0, the device is disabled from learning dynamic ARP entries.

Examples

# Configure the device to learn a maximum of 64 dynamic ARP entries.

<Sysname> system-view

[Sysname] arp max-learning-number 64 slot 1

arp mode uni

Use arp mode uni to configure a port as a customer-side port.

Use undo arp mode to restore the default.

Syntax

arp mode uni

undo arp mode

Default

A port operates as a network-side port.

Views

VLAN interface view

VXLAN VSI interface view

Predefined user roles

network-admin

Usage guidelines

By default, the device associates an ARP entry with routing information when the device learns an ARP entry. The ARP entry provides the next hop information for routing. To save hardware resources, you can use this command to specify a port that connects to a user terminal as a customer-side port. The device will not associate the routing information with the learned ARP entries.

Examples

# Configure VLAN-interface 2 as a customer-side port.

<Sysname> system-view

[Sysname] interface vlan-interface 2

[Sysname-Vlan-interface2] arp mode uni

arp multiport

Use arp multiport to configure a multiport ARP entry.

Use undo arp to delete an ARP entry.

Syntax

arp multiport ip-address mac-address vlan-id [ vpn-instance vpn-instance-name ]

undo arp ip-address [ vpn-instance-name ]

Default

No multiport ARP entries exist.

Views

System view

Predefined user roles

network-admin

Parameters

ip-address: Specifies an IP address for the multiport ARP entry.

mac-address: Specifies a MAC address for the multiport ARP entry, in the format of H-H-H.

vlan-id: Specifies a VLAN for the multiport ARP entry, in the range of 1 to 4094. The specified VLAN must already exist.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance to which the multiport ARP entry belongs. The vpn-instance-name argument represents the VPN instance name, a case-sensitive string of 1 to 31 characters. The specified VPN instance must already exist. To specify a multiport ARP entry on the public network, do not specify this option.

Usage guidelines

If the VLAN or the corresponding VLAN interface is deleted, the multiport ARP entry is also deleted.

To make the multiport ARP entry effective for packet forwarding, you must configure a multicast or multiport unicast MAC address entry to specify multiple output interfaces. The MAC address entry must have the same MAC address and VLAN ID as the multiport ARP entry. In addition, the IP address in the multiport ARP entry must reside on the same subnet as the VLAN interface of the specified VLAN.

Examples

# Configure a multiport ARP entry that contains IP address 202.38.10.2 and MAC address 00e0-fc01-0000 in VLAN 10.

<Sysname> system-view

[Sysname] arp multiport 202.38.10.2 00e0-fc01-0000 10

Related commands

display arp multiport

reset arp multiport

arp smooth

Use arp smooth to synchronize ARP entries from the master device to all subordinate devices.

Syntax

arp smooth

Views

User view

Predefined user roles

network-admin

Examples

# Synchronize ARP entries from the master device to all subordinate devices.

<Sysname> arp smooth

arp static

Use arp static to configure a static ARP entry.

Use undo arp to delete an ARP entry.

Syntax

arp static ip-address mac-address [ vlan-id interface-type interface-number | vsi-interface vsi-interface-id tunnel number vsi vsi-name | vsi-interface vsi-interface-id interface-type interface-number service-instance instance-id vsi vsi-name ] [ vpn-instance vpn-instance-name ]

undo arp ip-address [ vpn-instance-name ]

Default

No static ARP entries exist.

Views

System view

Predefined user roles

network-admin

Parameters

ip-address: Specifies an IP address for the static ARP entry.

mac-address: Specifies a MAC address for the static ARP entry, in the format of H-H-H.

vlan-id: Specifies the ID of a VLAN to which the static ARP entry belongs. The value range is 1 to 4094.

interface-type interface-number: Specifies an interface by its type and number.

vsi-interface vsi-interface-id: Specifies a VSI interface by its number.

tunnel number: Specifies a tunnel interface by its number in the range of 0 to 1.

service-instance instance-id: Specifies an Ethernet service instance by its ID in the range of 1 to 4096. You must specify this option if you specify a Layer 2 Ethernet interface for the preceding interface-type interface-number arguments. Do not specify this option if you specify an interface of other types for the preceding interface-type interface-number argument.

vsi vsi-name: Specifies a VSI by its name, a case-sensitive string of 1 to 31 characters.

vpn-instance vpn-instance-name: Specifies an MPLS L3VPN instance to which the static ARP entry belongs. The vpn-instance-name argument represents the VPN instance name, a case-sensitive string of 1 to 31 characters. The VPN instance must already exist. To specify a static ARP entry on the public network, do not specify this option.

Usage guidelines

A static ARP entry is manually configured and maintained. It does not age out and cannot be overwritten by any dynamic ARP entry.

Static ARP entries can be short or long.

A resolved short static ARP entry becomes unresolved upon certain events, for example, when the resolved output interface goes down, or the corresponding VLAN or VLAN interface is deleted.

Long static ARP entries are effective or ineffective. Ineffective long static ARP entries cannot be used for packet forwarding. A long static ARP entry is ineffective when any of the following conditions exists:

· The corresponding VLAN interface or output interface is down.

· The IP address in the entry conflicts with a local IP address.

· No local interface has an IP address in the same subnet as the IP address in the ARP entry.

If you specify the vlan-id interface-type interface-number argument, follow these restrictions and guidelines:

· The interface can be an Ethernet interface or an aggregate interface.

· The VLAN and VLAN interface must already exist. The specified Ethernet interface must belong to the specified VLAN.

· The IP address of the VLAN interface and the IP address specified by the ip-address argument must be on the same network.

· A long static ARP entry in a VLAN is deleted if the VLAN or VLAN interface is deleted.

On a VXLAN IP gateway that forwards traffic among VXLANs through VXLAN tunnels, a VSI interface can act as the gateway for multiple VXLANs. The VSI interface (input interface) might be connected to multiple VXLAN tunnel interfaces (output interfaces). In this case, you must specify the vsi-interface vsi-interface-id tunnel number vsi vsi-name parameters to identify a VSI interface-VSI-VXLAN tunnel interface binding. For more information about VSI interfaces, VSI, and VXLAN tunnel interfaces, see VXLAN Configuration Guide.

On a VXLAN IP gateway that forwards traffic from multiple local sites to remote sites, a VSI interface can act as the gateway for multiple local sites. The VSI interface (input interface) might be associated with multiple Ethernet services (output interfaces) on Layer 2 Ethernet interfaces through which the VSI interface connects to the local sites. In this case, you must specify the vsi-interface vsi-interface-id interface-type interface-number service-instance instance-id vsi vsi-name parameters to identify a VSI interface-Layer 2 Ethernet interface-Ethernet service instance-VSI binding. For more information about VSI interfaces, VSI, and Ethernet service instances, see VXLAN Configuration Guide.

Examples

# Configure a long static ARP entry that contains IP address 202.38.10.2, MAC address 00e0-fc01-0000, and output interface Ten-GigabitEthernet 1/0/1 in VLAN 10.

<Sysname> system-view

[Sysname] arp static 202.38.10.2 00e0-fc01-0000 10 ten-gigabitethernet 1/0/1

# Configure a long static ARP entry that contains IP address 1.1.1.1, MAC address 00e0-fc01-0000, input interface VSI-interface 1, output interface Tunnel 1, and VSI a.

<Sysname> system-view

[Sysname] arp static 1.1.1.1 00e0-fc01-0000 vsi-interface 1 tunnel 1 vsi a

# Configure a long static ARP entry that contains IP address 1.1.1.1, MAC address 00e0-fc01-0000, input interface VSI-interface 1, output interface Ethernet instance 1 on Ten-GigabitEthernet 1/0/1, and VSI a.

<Sysname> system-view

[Sysname] arp static 1.1.1.1 00e0-fc01-0000 vsi-interface 1 ten-gigabitethernet 1/0/1 service-in

stance 1 vsi a

Related commands

display arp

reset arp

arp timer aging

Use arp timer aging to set the aging timer for dynamic ARP entries.

Use undo arp timer aging to restore the default.

Syntax

arp timer aging { aging-minutes | second aging-seconds }

undo arp timer aging

Default

The aging timer for dynamic ARP entries is 20 minutes.

Views

System view

Predefined user roles

network-admin

Parameters

aging-minutes: Specifies the aging timer in minutes. The value range for this argument is 1 to 1440.

second aging-seconds: Specifies the aging timer in seconds. The value range for the aging-seconds argument is 5 to 86400.

Usage guidelines

Each dynamic ARP entry in the ARP table has a limited lifetime, called an aging timer. The aging timer of a dynamic ARP entry is reset each time the dynamic ARP entry is updated. Dynamic ARP entries that are not updated before their aging timers expire are deleted from the ARP table.

Set the aging timer for dynamic ARP entries as needed. For example, when you configure proxy ARP, set a short aging time so that invalid dynamic ARP entries can be deleted in a timely manner.

Examples

# Set the aging timer for dynamic ARP entries to 10 minutes.

<Sysname> system-view

[Sysname] arp timer aging 10

# Set the aging timer for dynamic ARP entries to 200 seconds.

<Sysname> system-view

[Sysname] arp timer aging second 200

Related commands

display arp timer aging

display arp

Use display arp to display ARP entries.

Syntax

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

all: Displays all ARP entries.

dynamic: Displays dynamic ARP entries.

multiport: Displays multiport ARP entries.

static: Displays static ARP entries.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays ARP entries for the master device.

vlan vlan-id: Specifies a VLAN by its VLAN ID. The VLAN ID is in the range of 1 to 4094.

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, this command displays ARP entries for all interfaces.

verbose: Displays detailed information about ARP entries.

Usage guidelines

This command displays information about ARP entries, including the IP address, MAC address, VLAN ID, output interface, entry type, and aging timer.

Examples

# Display all ARP entries.

<Sysname> display arp all

IP address MAC address VLAN/VSI Interface/Link ID Aging Type

1.1.1.1 02e0-f102-0023 1 XGE1/0/1 -- S

1.1.1.2 00e0-fc00-0001 12 XGE1/0/2 960 D

1.1.1.3 00e0-fe50-6503 12 Tunnel1 960 D

1.1.1.4 000d-88f7-9f7d 12 0x1 960 D

# Display detailed information about all ARP entries.

IP address : 1.1.1.1 MAC address : 02e0-f102-0023

Type : Static Aging : --

Interface : XGE1/0/1 VLAN : 1

VPN instance : --

Link ID : --

VXLAN ID : --

VSI name : --

VSI interface : --

Nickname : 0x0000

IP address : 1.1.1.2 MAC address : 0015-e944-adc5

Type : Static Aging : 960 sec

Interface : XGE1/0/2 VLAN : 12

VPN instance : --

Link ID : --

VXLAN ID : --

VSI name : --

VSI interface : --

Nickname : 0x0000

IP address : 1.1.1.3 MAC address : 0013-1234-0001

Type : Dynamic Aging : 960 sec

Interface : Tunnel1 VLAN : 12

VPN instance : --

Link ID : --

VXLAN ID : --

VSI name : vpna

VSI interface : Vsi1

Nickname : 0x0000

IP address : 1.1.1.4 MAC address : 0012-1234-0002

Type : Dynamic Aging : 960 sec

Interface : -- VLAN : 12

VPN instance : --

Link ID : 0x1

VXLAN ID : --

VSI name : vpna

VSI interface : Vsi1

Nickname : 0x0000

# Display the number of all ARP entries.

<Sysname> display arp all count

Total number of entries : 4

Table 1 Command output

Field	Description
IP address	IP address in an ARP entry.
MAC address	MAC address in an ARP entry.
VLAN/VSI	ID of the VLAN or index of the VSI to which the ARP entry belongs. This field displays hyphens (--) in either of the following situations: · The ARP entry is an unresolved short static ARP entry. · The output interface of the ARP entry does not belong to the VLAN or VSI.
Interface	Output interface in an ARP entry. This field displays hyphens (--) in either of the following situations: · The ARP entry is an unresolved short static ARP entry. · The ARP entry is a multiport ARP entry and has no output interface information. To obtain the output interface information of the multiport ARP entry, look up the MAC address table according to the MAC address in the ARP entry.
Link ID	Link ID in an ARP entry. This field displays hyphens (--) if the ARP entry does not belong to any VSI.
Aging	Aging time for an ARP entry in seconds. For a static ARP entry, this field always displays hyphens (--). The static ARP entry never ages out unless you delete it manually. For a dynamic ARP entry, this field displays hyphens (--) if the aging time is unknown.
Type	ARP entry type: · D—Dynamic. · S—Static. · O—OpenFlow. · R—Rule. · M—Multiport. · I—Invalid.
VPN instance	Name of VPN instance. If no VPN instance is configured for the ARP entry, this field displays hyphens (--).
Service instance	Ethernet service instance in an ARP entry. This field displays hyphens (--) if no Ethernet service instance is specified for the Layer 2 Ethernet interface or Layer 2 aggregate interface in the ARP entry.
VXLAN ID	ID of the VXLAN to which the ARP entry belongs. VXLAN ID is also called VNI. If the ARP entry does not belong to any VXLAN, this field displays hyphens (--).
VSI name	Name of the VSI to which the ARP entry belongs. If the ARP entry does not belong to any VSI, this field displays hyphens (--).
VSI interface	Name of the gateway interface of the VSI. If no gateway interface is specified for the VSI, this field displays hyphens (--).
Nickname	Nickname of the ARP entry. The nickname is a string of four hexadecimal numbers, for example, 012a. For more information about the nickname, see TRILL Configuration Guide.
Total number of entries	Number of ARP entries.

Related commands

arp static

reset arp

display arp entry-limit

Use display arp entry-limit to display the maximum number of ARP entries that a device supports.

Syntax

display arp entry-limit

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display the maximum number of ARP entries that the device supports.

<Sysname> display arp entry-limit

ARP entries: 8192

display arp ip-address

Use display arp ip-address to display the ARP entry for an IP address.

Syntax

display arp ip-address [ slot slot-number ] [ verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

ip-address: Displays the ARP entry for the specified IP address.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays information for the master device.

verbose: Displays the detailed information about the specified ARP entry.

Usage guidelines

The ARP entry information includes the IP address, MAC address, VLAN ID, output interface, entry type, and aging timer.

Examples

# Display the ARP entry for the IP address 20.1.1.1.

<Sysname> display arp 20.1.1.1

Type: S-Static D-Dynamic O-Openflow R-Rule M-Multiport I-Invalid

IP address MAC address VLAN/VSI Interface Aging Type

20.1.1.1 00e0-fc00-0001 -- -- -- S

Related commands

arp static

reset arp

display arp openflow count

Use display arp openflow count to display the number of OpenFlow ARP entries.

Syntax

display arp openflow count [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays the number of OpenFlow ARP entries for the master device.

Examples

# Display the number of OpenFlow ARP entries.

<Sysname> display arp openflow count

Total number of OpenFlow ARP entries: 6

display arp timer aging

Use display arp timer aging to display the aging timer of dynamic ARP entries.

Syntax

display arp timer aging

Views

Any view

Predefined user roles

network-admin

network-operator

Examples

# Display the aging timer of dynamic ARP entries.

<Sysname> display arp timer aging

Current ARP aging time is 1200 seconds

Related commands

arp timer aging

display arp vpn-instance

Use display arp vpn-instance to display the ARP entries for a VPN instance.

Syntax

display arp vpn-instance vpn-instance-name [ count ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

vpn-instance-name: Specifies an MPLS L3VPN instance by its name, a case-sensitive string of 1 to 31 characters. The VPN instance name cannot contain any spaces.

Usage guidelines

This command displays information about ARP entries for a VPN instance, including the IP address, MAC address, VLAN ID, output interface, entry type, and aging timer.

Examples

# Display ARP entries for VPN instance test.

<Sysname> display arp vpn-instance test

Type: S-Static D-Dynamic O-Openflow R-Rule M-Multiport I-Invalid

IP address MAC address VLAN/VSI Interface Aging Type

20.1.1.1 00e0-fc00-0001 -- -- -- S

Related commands

arp static

reset arp

Use reset arp to clear ARP entries from the ARP table.

Syntax

reset arp { all | dynamic | interface interface-type interface-number | multiport | slot slot-number | static }

Views

User view

Predefined user roles

network-admin

Parameters

all: Clears all ARP entries.

dynamic: Clears all dynamic ARP entries.

multiport: Clears all multiport ARP entries.

static: Clears all static ARP entries.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command clears ARP entries for the master device.

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, this command clears ARP entries for all interfaces.

Examples

# Clear all static ARP entries.

<Sysname> reset arp static

Related commands

arp static

display arp

Gratuitous ARP commands

arp ip-conflict log prompt

Use arp ip-conflict log prompt to enable IP conflict notification.

Use undo arp ip-conflict log prompt to restore the default.

Syntax

arp ip-conflict log prompt

undo arp ip-conflict log prompt

Default

IP conflict notification is disabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

By default, the device performs the following operations if it is using the sender IP address of a received ARP packet:

· Sends a gratuitous ARP request.

· Displays an error message after the device receives an ARP reply about the conflict.

You can use this command to enable the device to display error messages before sending a gratuitous ARP reply or request for conflict confirmation.

Examples

# Enable IP conflict notification on the device.

<Sysname> system-view

[Sysname] arp ip-conflict log prompt

arp send-gratuitous-arp

Use arp send-gratuitous-arp to enable periodic sending of gratuitous ARP packets on an interface.

Use undo arp send-gratuitous-arp to disable the interface from periodically sending gratuitous ARP packets.

Syntax

arp send-gratuitous-arp [ interval interval ]

undo arp send-gratuitous-arp

Default

Periodic sending of gratuitous ARP packets is disabled.

Views

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Layer 3 aggregate interface view

Layer 3 aggregate subinterface view

VXLAN VSI interface view

VLAN interface view

Predefined user roles

network-admin

Parameters

interval interval: Specifies the sending interval in the range of 200 to 200000 milliseconds. The default value is 2000 milliseconds.

Usage guidelines

This feature takes effect on an interface only when the interface has an IP address and the data link layer state of the interface is up.

This feature can send gratuitous ARP requests only for a VRRP virtual IP address, or the sending interface's primary IP address or manually configured secondary IP address. The primary IP address can be configured manually or automatically, whereas the secondary IP address must be configured manually.

If you change the sending interval for gratuitous ARP packets, the configuration takes effect at the next sending interval.

The sending interval for gratuitous ARP packets might be much longer than the set interval when any of the following conditions exist:

· This feature is enabled on multiple interfaces.

· Each interface is configured with multiple secondary IP addresses.

· A small sending interval is configured in the preceding cases.

Examples

# Enable VLAN-interface 2 to send gratuitous ARP packets every 300 milliseconds.

<Sysname> system-view

[Sysname] interface vlan-interface 2

[Sysname-Vlan-interface2] arp send-gratuitous-arp interval 300

gratuitous-arp mac-change retransmit

Use gratuitous-arp mac-change retransmit to set the times and the interval for retransmitting a gratuitous ARP packet for the device MAC address change.

Use undo gratuitous-arp mac-change retransmit to restore the default.

Syntax

gratuitous-arp mac-change retransmit times interval seconds

undo gratuitous-arp mac-change retransmit

Default

The device sends a gratuitous packet for its MAC address change once only.

Views

System view

Predefined user roles

network-admin

Parameters

times: Specifies the times of retransmitting a gratuitous packet, in the range of 1 to 10.

interval seconds: Specifies the interval for retransmitting a gratuitous packet, in the range of 1 to 10 seconds.

Usage guidelines

The device sends a gratuitous ARP packet to inform other devices of its MAC address change. However, the other devices might fail to receive the packet because the device sends the gratuitous ARP packet once only by default. Use this command to configure gratuitous ARP retransmission parameters to ensure that the other devices can receive the packet.

After you execute this command, the device will retransmit a gratuitous ARP packet for its MAC address change at the specified interval for the specified times.

Examples

# Set the times to 3 and the interval to 5 for retransmitting a gratuitous ARP packet for the device MAC address change.

<Sysname> system-view

[Sysname] gratuitous-arp mac-change retransmit 3 interval 5

gratuitous-arp-learning enable

Use gratuitous-arp-learning enable to enable learning of gratuitous ARP packets.

Use undo gratuitous-arp-learning enable to disable learning of gratuitous ARP packets.

Syntax

gratuitous-arp-learning enable

undo gratuitous-arp-learning enable

Default

Learning of gratuitous ARP packets is enabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

The learning of gratuitous ARP packets feature allows a device to maintain its ARP table by creating or updating ARP entries based on received gratuitous ARP packets.

When this feature is disabled, the device uses received gratuitous ARP packets to update existing ARP entries only. ARP entries are not created based on the received gratuitous ARP packets, which saves ARP table space.

Examples

# Enable learning of gratuitous ARP packets.

<Sysname> system-view

[Sysname] gratuitous-arp-learning enable

gratuitous-arp-sending enable

Use gratuitous-arp-sending enable to enable sending gratuitous ARP packets upon receiving ARP requests whose sender IP address is on a different subnet.

Use undo gratuitous-arp-sending enable to disable sending gratuitous ARP packets upon receiving ARP requests whose sender IP address is on a different subnet.

Syntax

gratuitous-arp-sending enable

undo gratuitous-arp-sending enable

Default

A device does not send gratuitous ARP packets when it receives ARP requests whose sender IP address is on a different subnet.

Views

System view

Predefined user roles

network-admin

Examples

# Disable a device from sending gratuitous ARP packets upon receiving ARP requests whose sender IP address is on a different subnet.

<Sysname> system-view

[Sysname] undo gratuitous-arp-sending enable

Proxy ARP commands

display local-proxy-arp

Use display local-proxy-arp to display the local proxy ARP status.

Syntax

display local-proxy-arp [ interface interface-type interface-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, this command displays the local proxy ARP status for all interfaces.

Usage guidelines

You can use this command to check whether local proxy ARP is enabled or disabled.

Examples

# Display the local proxy ARP status for VLAN-interface 2.

<Sysname> display local-proxy-arp interface vlan-interface 2

Interface Vlan-interface2

Local Proxy ARP status: enabled

Related commands

local-proxy-arp enable

display proxy-arp

Use display proxy-arp to display the proxy ARP status.

Syntax

display proxy-arp [ interface interface-type interface-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

interface interface-type interface-number: Specifies an interface by its type and number. If you do not specify an interface, this command displays the proxy ARP status for all interfaces.

Usage guidelines

You can use this command to check whether proxy ARP is enabled or disabled.

Examples

# Display the proxy ARP status on VLAN-interface 2.

<Sysname> display proxy-arp interface vlan-interface 2

Interface Vlan-interface2

Proxy ARP status: disabled

Related commands

proxy-arp enable

local-proxy-arp enable

Use local-proxy-arp enable to enable local proxy ARP.

Use undo local-proxy-arp enable to disable local proxy ARP.

Syntax

local-proxy-arp enable [ ip-range start-ip-address to end-ip-address ]

undo local-proxy-arp enable

Default

Local proxy ARP is disabled.

Views

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Layer 3 aggregate interface view

Layer 3 aggregate subinterface view

VXLAN VSI interface view

VLAN interface view

Predefined user roles

network-admin

Parameters

ip-range start-ip-address to end-ip-address: Specifies the IP address range for which local proxy ARP is enabled. The start IP address must be lower than or equal to the end IP address.

Usage guidelines

Proxy ARP enables a device on a network to answer ARP requests for an IP address not on that network. With proxy ARP, hosts in different broadcast domains can communicate with each other as they do on the same network.

Proxy ARP includes common proxy ARP and local proxy ARP.

Common proxy ARP allows communication between hosts that connect to different Layer 3 interfaces and reside in different broadcast domains.

Local proxy ARP allows communication between hosts that connect to the same Layer 3 interface and reside in different broadcast domains.

If you execute this command multiple times, the most recent configuration takes effect.

Examples

# Enable local proxy ARP on VLAN-interface 2.

<Sysname> system-view

[Sysname] interface vlan-interface 2

[Sysname-Vlan-interface2] local-proxy-arp enable

# Enable local proxy ARP on VLAN-interface 2 for an IP address range.

<Sysname> system-view

[Sysname] interface vlan-interface 2

[Sysname-Vlan-interface2] local-proxy-arp enable ip-range 1.1.1.1 to 1.1.1.20

Related commands

display local-proxy-arp

proxy-arp enable

Use proxy-arp enable to enable proxy ARP.

Use undo proxy-arp enable to disable proxy ARP.

Syntax

proxy-arp enable

undo proxy-arp enable

Default

Proxy ARP is disabled.

Views

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Layer 3 aggregate interface view

Layer 3 aggregate subinterface view

VXLAN VSI interface view

VLAN interface view

Predefined user roles

network-admin

Usage guidelines

Proxy ARP includes common proxy ARP and local proxy ARP.

Common proxy ARP allows communication between hosts that connect to different Layer 3 interfaces and reside in different broadcast domains.

Local proxy ARP allows communication between hosts that connect to the same Layer 3 interface and reside in different broadcast domains.

Examples

# Enable proxy ARP on VLAN-interface 2.

<Sysname> system-view

[Sysname] interface vlan-interface 2

[Sysname-Vlan-interface2] proxy-arp enable

Related commands

display proxy-arp

ARP snooping commands

arp snooping enable

Use arp snooping enable to enable ARP snooping.

Use undo arp snooping enable to disable ARP snooping.

Syntax

arp snooping enable

undo arp snooping enable

Default

ARP snooping is disabled.

Views

VLAN view

Predefined user roles

network-admin

Examples

# Enable ARP snooping for VLAN 2.

<Sysname> system-view

[Sysname] vlan 2

[Sysname-vlan2] arp snooping enable

display arp snooping

Use display arp snooping to display ARP snooping entries.

Syntax

display arp snooping [ vlan vlan-id ] [ slot slot-number ] [ count ]

display arp snooping ip ip-address [ slot slot-number ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

vlan vlan-id: Displays ARP snooping entries for a VLAN. The vlan-id argument is in the range of 1 to 4094.

ip ip-address: Displays the ARP snooping entry for the specified IP address.

slot slot-number: Specifies an IRF member device by its member ID. If you do not specify a member device, this command displays ARP snooping entries for the master device.

Examples

# Display ARP snooping entries for VLAN 2.

<Sysname> display arp snooping vlan 2

IP Address MAC Address VLAN ID Interface Aging Status

3.3.3.3 0003-0003-0003 2 XGE1/0/1 20 Valid

3.3.3.4 0004-0004-0004 2 XGE1/0/2 5 Invalid

# Display the number of the ARP snooping entries.

<Sysname> display arp snooping count

Total entries: 2

Table 2 Command output

Field	Description
IP Address	IP address in an ARP snooping entry.
MAC Address	MAC address in an ARP snooping entry.
VLAN ID	ID of the VLAN to which the ARP snooping entry belongs.
Interface	Input interface in an ARP snooping entry.
Aging	Aging time for an ARP snooping entry in minutes. If the member device learns an ARP snooping entry from another member, the member device cannot learn the aging time of the entry, and this field displays N/A.
Status	Status of an ARP snooping entry: Valid, Invalid, Collision.
Total entries	Number of ARP snooping entries.

Related commands

reset arp snooping

Use reset arp snooping to delete ARP snooping entries.

Syntax

reset arp snooping [ ip ip-address | vlan vlan-id ]

Views

User view

Predefined user roles

network-admin

Parameters

ip ip-address: Deletes the ARP snooping entry for the specified IP address.

vlan vlan-id: Deletes ARP snooping entries for the specified VLAN. The value range for the vlan-id argument is 1 to 4094.

Usage guidelines

If you do not specify any option, the command deletes all ARP snooping entries.

Examples

# Delete ARP snooping entries for VLAN 2.

<Sysname> reset arp snooping vlan 2

Related commands

display arp snooping

ARP fast-reply commands

arp fast-reply enable

Use arp fast-reply enable to enable ARP fast-reply for a VLAN.

Use undo arp fast-reply enable to disable ARP fast-reply for a VLAN.

Syntax

arp fast-reply enable

undo arp fast-reply enable

Default

ARP fast-reply is disabled on a VLAN.

Views

VLAN view

Predefined user roles

network-admin

Examples

# Enable ARP fast-reply for VLAN 2.

<Sysname> system-view

[Sysname] vlan 2

[Sysname-vlan2] arp fast-reply enable

ARP direct route advertisement commands

arp route-direct advertise

Use arp route-direct advertise to enable ARP direct route advertisement.

Use undo arp route-direct advertise to disable ARP direct route advertisement.

Syntax

arp route-direct advertise

undo arp route-direct advertise

Default

ARP direct route advertisement is disabled.

Views

Layer 3 Ethernet interface view

Layer 3 Ethernet subinterface view

Layer 3 aggregate interface view

Layer 3 aggregate subinterface view

VLAN interface view

Predefined user roles

network-admin

Examples

# Enable ARP direct route advertisement on Layer 3 Ethernet interface Ten-GigabitEthernet 1/0/1.

<Sysname> system-view

[Sysname] interface ten-gigabitethernet 1/0/1

[Sysname-Ten-GigabitEthernet1/0/1] arp route-direct advertise

04-Layer 3—IP Services Command Reference

arp multiport

arp timer aging

display arp ip-address

display arp vpn-instance

reset arp

gratuitous-arp mac-change retransmit

display local-proxy-arp

display proxy-arp

local-proxy-arp enable

ARP snooping commands

display arp snooping

reset arp snooping

ARP fast-reply commands

ARP direct route advertisement commands

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