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| Title | Size | Download |
|---|---|---|
| 02-ARP Commands | 52.19 KB |
l Support of the H3C WA series WLAN access points (APs) for commands may vary by AP model. For more information, see Feature Matrix.
l The interface types and the number of interfaces vary by AP model.
l The models listed in this document are not applicable to all regions. Please consult your local sales office for the models applicable to your region.
ARP Configuration Commands
arp check enable
Syntax
arp check enable
undo arp check enable
View
System view
Default Level
2: System level
Parameters
None
Description
Use the arp check enable command to enable ARP entry check. With this function enabled, the AP cannot learn any ARP entry with a multicast MAC address, and you cannot configure such a static ARP entry with a multicast MAC address on the AR; otherwise, the system displays error messages.
Use the undo arp check enable command to disable the function. After ARP entry check is disabled, the AP can learn the ARP entry with a multicast MAC address, and you can also configure such a static ARP entry on the AP.
By default, ARP entry check is enabled.
Examples
# Enable ARP entry check.
<Sysname> system-view
[Sysname] arp check enable
arp max-learning-num
Syntax
arp max-learning-num number
undo arp max-learning-num
View
Ethernet interface view, VLAN interface view
Default Level
2: System level
Parameters
number: Maximum number of dynamic ARP entries that an interface can learn, in the range of 0 to 256. The default value is 256.
Description
Use the arp max-learning-num command to set the maximum number of dynamic ARP entries that an interface can learn.
Use the undo arp max-learning-num command to restore the default.
Examples
# Specify VLAN-interface 40 to learn up to 30 dynamic ARP entries.
<Sysname> system-view
[Sysname] interface vlan-interface 40
[Sysname-Vlan-interface40] arp max-learning-num 30
arp static
Syntax
arp static ip-address mac-address [ vlan-id interface-type interface-number ]
undo arp ip-address
View
System view
Default Level
2: System level
Parameters
ip-address: IP address in an ARP entry.
mac-address: MAC address in an ARP entry, in the format H-H-H.
vlan-id: ID of a VLAN to which a static ARP entry belongs to, in the range 1 to 4094.
interface-type interface-number: Interface type and interface number.
Description
Use the arp static command to configure a static ARP entry in the ARP mapping table.
Use the undo arp command to remove an ARP entry.
Note that:
l A static ARP entry is effective when the AP works normally. However, when the VLAN or VLAN interface to which an ARP entry corresponds is deleted, the entry, if permanent, will be deleted, and if non-permanent and resolved, will become unresolved.
l The vlan-id argument is used to specify the corresponding VLAN of an ARP entry and must be the ID of an existing VLAN. In addition, the Ethernet interface following the argument must belong to that VLAN. The VLAN interface of the VLAN must have been created.
l If both the vlan-id and ip-address arguments are specified, the IP address of the VLAN interface corresponding to the vlan-id argument must belong to the same network segment as the IP address specified by the ip-address argument.
Related commands: reset arp and display arp.
Examples
# Configure a static ARP entry, with the IP address being 202.38.10.2, the MAC address being 00e0-fc01-0000, and the outbound interface being Ethernet 1/0/1 of VLAN 10.
<Sysname> system-view
[Sysname] arp static 202.38.10.2 00e0-fc01-0000 10 ethernet 1/0/1
arp timer aging
Syntax
arp timer aging aging-time
undo arp timer aging
View
System view
Default Level
2: System level
Parameters
aging-time: Age timer for dynamic ARP entries in minutes, in the range 1 to 1,440.
Description
Use the arp timer aging command to set the age timer for dynamic ARP entries.
Use the undo arp timer aging command to restore the default.
By default, the age timer for dynamic ARP entries is 20 minutes.
Related commands: display arp timer aging.
Examples
# Set the age timer for dynamic ARP entries to 10 minutes.
<Sysname> system-view
display arp
Syntax
display arp [ [ all | dynamic | static ] | vlan vlan-id | interface interface-type interface-number ] [ | { begin | exclude | include } regular-expression ] | count ]
View
Any view
Default Level
1: Monitor level
Parameters
all: Displays all ARP entries.
dynamic: Displays dynamic ARP entries.
static: Displays static ARP entries.
vlan vlan-id: Displays the ARP entries of the specified VLAN. The VLAN ID ranges from 1 to 4,094.
interface interface-type interface-number: Displays the ARP entries of the interface specified by the argument interface-type interface-number.
|: Uses a regular expression to specify the ARP entries to be displayed. For more information about regular expressions, see CLI in the Fundamentals Configuration Guide.
begin: Displays ARP entries from the first one containing the specified string.
exclude: Displays the ARP entries that do not contain the specified string.
include: Displays the ARP entries containing the specified string.
regular-expression: A case-sensitive string for matching, consisting of 1 to 256 characters.
count: Displays the number of ARP entries.
Description
Use the display arp command to display ARP entries in the ARP mapping table.
If no parameter is specified, all ARP entries are displayed.
Related commands: arp static and reset arp.
Examples
# Display the detailed information of all ARP entries.
Type: S-Static D-Dynamic
IP Address MAC Address VLAN ID 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 Ethernet1/0/1 14 D
192.168.0.115 000d-88f7-9f7d 1 Ethernet1/0/2 18 D
Table 1-1 display arp command output description
|
Field |
Description |
|
IP Address |
IP address in an ARP entry |
|
MAC Address |
MAC address in an ARP entry |
|
VLAN ID |
VLAN ID contained a static ARP entry |
|
Interface |
Outbound interface in an ARP entry |
|
Aging |
Age timer for a dynamic ARP entry in minutes (“N/A” means unknown age timer or no age timer) |
|
Type |
ARP entry type: D stands for dynamic, S for static, and A for authorized. |
# Display the number of all ARP entries
<Sysname> display arp all count
Total Entry(ies): 2
display arp ip-address
Syntax
display arp ip-address [ | { begin | exclude | include } regular-expression ]
View
Any view
Default Level
1: Monitor level
Parameters
ip-address: Displays the ARP entry for the specified IP address.
|: Uses a regular expression to specify the ARP entries to be displayed. For detailed information about regular expressions, see CLI in the Fundamentals Configuration Guide.
begin: Displays the ARP entries from the first one containing the specified string.
exclude: Displays the ARP entries that do not contain the specified string.
Include: Displays the ARP entries that contain the specified string.
regular-expression: A case-sensitive string for matching, consisting of 1 to 256 characters.
Description
Use the display arp ip-address command to display the ARP entry for a specified IP address.
Related commands: arp static and reset arp.
Examples
# Display the corresponding ARP entry for the IP address 20.1.1.1.
<Sysname> display arp 20.1.1.1
Type: S-Static D-Dynamic
IP Address MAC Address VLAN ID Interface Aging Type
20.1.1.1 00e0-fc00-0001 N/A N/A N/A S
display arp timer aging
Syntax
display arp timer aging
View
Any view
Default Level
2: System level
Parameters
None
Description
Use the display arp timer aging command to display the age timer for dynamic ARP entries.
Related commands: arp timer aging.
Examples
# Display the age timer for dynamic ARP entries.
[Sysname] display arp timer aging
Current ARP aging time is 10 minute(s)
naturemask-arp enable
Syntax
naturemask-arp enable
undo naturemask-arp enable
View
System view
Default Level
2: System level
Parameters
None
Description
Use the naturemask-arp enable command to cancel the restriction that ARP requests must be from the same subnet. In this case, ARP requests from a natural network are supported.
Use the undo naturemask-arp enable command to restore the default.
By default, the support for ARP requests from a natural network is disabled.
Examples
# Enable the support for ARP requests from a natural network.
<Sysname> system-view
[Sysname] naturemask-arp enable
reset arp
Syntax
reset arp { all | dynamic | static | interface interface-type interface-number }
View
User view
Default Level
2: System level
Parameters
all: Clears all ARP entries except authorized ARP entries.
dynamic: Clears all dynamic ARP entries.
static: Clears all static ARP entries.
interface interface-type interface-number: Clears the ARP entries for the interface specified by the argument interface-type interface-number.
Description
Use the reset arp command to clear ARP entries except authorized ARP entries from the ARP mapping table.
With interface interface-type interface-number or slot slot-id specified, the command clears only dynamic ARP entries of the interface or the slot.
Related commands: arp static and display arp.
Examples
# Clear all static ARP entries.
<Sysname> reset arp static
Gratuitous ARP Configuration Commands
gratuitous-arp-sending enable
Syntax
gratuitous-arp-sending enable
undo gratuitous-arp-sending enable
View
System view
Default Level
2: System level
Parameters
None
Description
Use the gratuitous-arp-sending enable command to enable the AP to send gratuitous ARP packets when receiving ARP requests from another network segment.
Use the undo gratuitous-arp-sending enable command to restore the default.
By default, an AP cannot send gratuitous ARP packets when receiving ARP requests from another network segment.
Examples
# Disable the gratuitous ARP packet sending function.
<Sysname> system-view
[Sysname] undo gratuitous-arp-sending enable
gratuitous-arp-learning enable
Syntax
gratuitous-arp-learning enable
undo gratuitous-arp-learning enable
View
System view
Default Level
2: System level
Parameters
None
Description
Use the gratuitous-arp-learning enable command to enable the gratuitous ARP packet learning function.
Use the undo gratuitous-arp-learning enable command to disable the function.
By default, the function is enabled.
With this function enabled, an AP receiving a gratuitous ARP packet can add the source IP and MAC addresses carried in the packet to its own dynamic ARP table if it finds no ARP entry in the cache corresponding to the source IP address of the ARP packet exists; if the corresponding ARP entry exists in the cache, the AP updates the ARP entry regardless of whether this function is enabled.
Examples
# Enable the gratuitous ARP packet learning function.
<Sysname> system-view
[Sysname] gratuitous-arp-learning enable
