04-Layer 3—IP Services Command Reference

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01-ARP commands
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01-ARP commands 102.76 KB

ARP commands

arp check enable

Use arp check enable to enable dynamic ARP entry check.

Use undo arp check enable to disable dynamic ARP entry check.

Syntax

arp check enable

undo arp check enable

Default

Dynamic ARP entry check is enabled.

Views

System view

Predefined user roles

network-admin

Usage guidelines

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 this function 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 function.

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

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 function 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 amount of ARP logs. To conserve system resources, enable ARP logging only when you are troubleshooting or debugging 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 number

undo arp max-learning-num

Default

An interface can learn a maximum of 1024 dynamic ARP entries.

Views

Layer 2 Ethernet interface view

Layer 2 aggregate interface view

VLAN interface view

Predefined user roles

network-admin

Parameters

number: Specifies the maximum number of dynamic ARP entries for an interface. The value range is 0 to 1024.

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 500 dynamic ARP entries.

<Sysname> system-view

[Sysname] interface vlan-interface 40

[Sysname-Vlan-interface40] arp max-learning-num 500

# Specify Ten-GigabitEthernet 1/0/1 to learn a maximum of 1000 dynamic ARP entries.

<Sysname> system-view

[Sysname] interface Ten-GigabitEthernet 1/0/1

[Sysname-Ten-GigabitEthernet1/0/1] arp max-learning-num 1000

# Specify Layer 2 aggregate interface bridge-aggregation 1 to learn a maximum of 1000 dynamic ARP entries.

<Sysname> system-view

[Sysname] interface bridge-aggregation 1

[Sysname-Bridge-Aggregation1] arp max-learning-num 1000

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 number slot slot-number

undo arp max-learning-number slot slot-number

Default

A device can learn a maximum of 1024 dynamic ARP entries.

Views

System view

Predefined user roles

network-admin

Parameters

number: Specifies the maximum number of dynamic ARP entries for a device. The value range is 0 to 1024.

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

# Set the IRF member device in slot 1 to learn a maximum of 64 dynamic ARP entries.

<Sysname> system-view

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

arp static

Use arp static to configure a static ARP entry.

Use undo arp to remove an ARP entry.

Syntax

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

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

Default

No static ARP entries are configured.

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. The VLAN and VLAN interface must already exist.

interface-type interface-number: Specifies an interface by its type and number. Make sure the interface belongs to the specified VLAN.

vpn-instance vpn-instance-name: Specifies a VPN instance for the static ARP entry. The vpn-instance-name argument is 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 classified into long and short static ARP entries. A short static ARP entry contains an IP-to-MAC mapping. A long static ARP entry contains an IP-to-MAC mapping, a VLAN, and an output interface.

A static ARP entry is effective when the device works correctly.

When the VLAN or VLAN interface is deleted, long static ARP entries in the VLAN are deleted, and resolved short static ARP entries in the VLAN become unresolved.

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

A long static ARP entry is ineffective when the corresponding VLAN interface or output interface is down. An ineffective long static ARP entry cannot be used to forward packets.

If you specify both the vlan-id and ip-address arguments, the IP address of the corresponding VLAN interface must be on the same network as the specified IP address.

If you do not specify a VPN, the undo arp command removes ARP entries only for the public network.

Examples

# Configure a static ARP entry that comprises 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

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-time

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-time: Sets the aging timer for dynamic ARP entries, in the range of 1 to 1440 minutes.

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 time.

Examples

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

<Sysname> system-view

[Sysname] arp timer aging 10

Related commands

display arp timer aging

display arp

Use display arp to display ARP entries.

Syntax

display arp [ [ all | dynamic | static ] [ slot slot-number ] | vlan vlan-id | interface interface-type interface-number ] [ count | verbose ]

Views

Any view

Predefined user roles

network-admin

network-operator

Parameters

all: Displays all ARP entries.

dynamic: Displays dynamic ARP entries.

static: Displays static ARP entries.

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

vlan vlan-id: Displays the ARP entries for the specified VLAN. The VLAN ID is in the range of 1 to 4094.

interface interface-type interface-number: Displays the ARP entries for the interface specified by the argument interface-type interface-number.

count: Displays the number of ARP entries.

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.

If you do not specify any parameters, the command displays all ARP entries.

Examples

# Display all ARP entries.

<Sysname> display arp all

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

IP Address       MAC Address     VLAN     Interface              Aging Type

20.1.1.1         00e0-fc00-0001  N/A      N/A                    N/A   S

193.1.1.70       00e0-fe50-6503  100      XGE1/0/1               N/A   IS

192.168.0.115    000d-88f7-9f7d  1        XGE1/0/2               18    D

192.168.0.39     0012-a990-2241  1        XGE1/0/3               20    D

22.1.1.1         000c-299d-c041  10       N/A                    N/A   M

# Display detailed information about all ARP entries.

<Sysname> display arp all verbose

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

IP Address       MAC Address     VLAN     Interface             Aging Type

Vpn Instance

20.1.1.1         00e0-fc00-0001  N/A      N/A                    N/A   S

[No Vrf]

193.1.1.70       00e0-fe50-6503  100      XGE1/0/1               N/A   IS

[No Vrf]

192.168.0.115    000d-88f7-9f7d  1        XGE1/0/2               18    D

[No Vrf]

192.168.0.39     0012-a990-2241  1        XGE1/0/3              20    D

[No Vrf]

22.1.1.1         000c-299d-c041  10       N/A                    N/A   M

[No Vrf]

# Display the number of all ARP entries.

<Sysname> display arp all count

 Total number of entries : 5

Table 1 Command output

Field

Description

IP Address

IP address in an ARP entry.

MAC Address

MAC address in an ARP entry.

VLAN

ID of the VLAN to which the ARP entry belongs. This field displays N/A 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.

Interface

Output interface in an ARP entry. This field displays N/A if the ARP entry is an unresolved short static ARP entry.

Aging

Aging time for a dynamic ARP entry in minutes. N/A means unknown aging time or no aging time.

Type

ARP entry type:

·     D—Dynamic.

·     S—Static.

·     O—OpenFlow.

·     I—Invalid.

Vpn Instance

Name of VPN instance. [No Vrf] is displayed if no VPN instance is configured for the ARP entry.

Total number of entries

Number of ARP entries.

 

Related commands

·     arp static

·     reset arp

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.

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   M-Multiport  I-Invalid

IP address       MAC address     VLAN     Interface              Aging Type

20.1.1.1         00e0-fc00-0001  N/A      N/A                    N/A   S

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: 1024

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 20 minute(s)

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 a VPN instance by its name, a case-sensitive string of 1 to 31 characters.

count: Displays the number of ARP entries.

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 the VPN instance named test.

<Sysname> display arp vpn-instance test

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

IP address       MAC address     VLAN ID  Interface              Aging Type

20.1.1.1         00e0-fc00-0001  N/A      N/A                    N/A   S

Related commands

·     arp static

·     reset arp

reset arp

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

Syntax

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

Views

User view

Predefined user roles

network-admin

Parameters

all: Clears all ARP entries.

dynamic: Clears all dynamic ARP entries.

static: Clears all static ARP entries.

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

interface interface-type interface-number: Clears the ARP entries for the interface specified by the argument interface-type interface-number.

Usage guidelines

This command can separately clear static ARP entries, dynamic ARP entries, or ARP entries on specified interfaces.

When the interface interface-type interface-number option is specified, this command clears only dynamic ARP entries for the specified interface.

When the slot slot-number option is specified, this command clears only dynamic ARP entries for the specified IRF member device.

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 without conflict confirmation.

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. The receiving device sends a gratuitous ARP request, and it displays an error message after it receives an ARP reply about the conflict.

Views

System view

Predefined user roles

network-admin

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 and set the sending interval 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 milliseconds ]

undo arp send-gratuitous-arp

Default

Periodic sending of gratuitous ARP is disabled.

Views

VLAN interface view

Predefined user roles

network-admin

Parameters

interval milliseconds: Sets the interval at which gratuitous ARP packets are sent, in the range of 200 to 200000 milliseconds. The default value is 2000 milliseconds.

Usage guidelines

This function takes effect only when the enabled interface is up and an IP address has been assigned to the interface.

This function 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 interval for sending gratuitous ARP packets, the configuration takes effect at the next sending interval.

The frequency of sending gratuitous ARP packets might be much lower than expected when any of the following conditions exist:

·     This function 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 seconds 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 function allows a device to maintain its ARP table by creating or updating ARP entries based on received gratuitous ARP packets.

When this function 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 of gratuitous ARP packets upon receiving ARP requests whose sender IP address is on a different subnet.

Use undo gratuitous-arp-sending enable to restore the default.

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: Displays the local proxy ARP status for the specified interface.

Usage guidelines

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

If an interface is specified, this command displays the local proxy ARP status for the specified interface.

If no interface is specified, this command displays the local proxy ARP status for all interfaces.

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: Displays the proxy ARP status for the specified interface.

Usage guidelines

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

If an interface is specified, this command displays proxy ARP status for the specified interface.

If no interface is specified, this command displays proxy ARP status for all interfaces.

Examples

# Display the proxy ARP status on VLAN-interface 1.

<Sysname> display proxy-arp interface Vlan-interface 1

Interface Vlan-interface1

 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 startIP to endIP ]

undo local-proxy-arp enable

Default

Local proxy ARP is disabled.

Views

VLAN interface view

Predefined user roles

network-admin

Parameters

ip-range startIP to endIP: 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.

Only one IP address range can be specified by using the ip-range keyword on an interface.

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

VLAN interface view

Predefined user roles

network-admin

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.

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 on 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.

count: Displays the number of the current ARP snooping entries.

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.

Usage guidelines

If you do not specify any keywords or arguments, the command displays all ARP snooping entries.

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 current 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.

Status

Status of an ARP snooping entry: Valid, Invalid, Collision.

Total entries

Number of ARP snooping entries.

 

Related commands

reset arp snooping

reset arp snooping

Use reset arp snooping to remove 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: Removes the ARP entry for the specified IP address.

vlan vlan-id: Removes the ARP entries for the specified VLAN. The vlan-id argument is in the range of 1 to 4094.

Usage guidelines

If you do not specify any keywords or arguments, the command removes all ARP snooping entries.

Examples

# Remove 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