Syntax
arp check enable
undo arp check enable
View
System view
Parameter
None
Description
Use the arp check enable command to
enable ARP entry checking, so as to disable the switch
from learning ARP entries with multicast MAC addresses.
Use the undo arp check enable
command to disable ARP entry checking. In this case, the switch is allowed to
learn multicast MAC address ARP entries.
By default, ARP entry checking is enabled.
Example
# Enable the switch to learn multicast MAC
address ARP entries.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] undo arp check enable
Syntax
arp max-entry number
undo arp max-entry
View
System view
Parameter
number: Total
maximum number of ARP entries, in the range of 4,096 to 8,192.
Description
Use the arp max-entry command to set
the total maximum number of ARP entries.
Use the undo arp max-entry command to
restore the default setting.
By default, the total maximum number of ARP
entries is 8,192.
Example
# Set the total maximum number of ARP
entries to 4,096.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] arp max-entry 4096
Syntax
arp max-dynamic-entry number
undo arp max-dynamic-entry
View
Port view
Parameter
number:
Maximum number of dynamic ARP entries that can be learnt by the port, ranging
from 0 to 8,192.
Description
Use the arp max-dynamic-entry command
to set the maximum number of dynamic ARP entries that can be learnt by a port.
Use the undo arp max-dynamic-entry
command to restore the default setting.
By default, the maximum number of dynamic
ARP entries that can be learnt by a port is 2,048.
Example
# Set maximum number of dynamic ARP entries
that can be learnt by GE 3/0/1 to 6,000.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] interface GigabitEthernet 3/0/1
[H3C GigabitEthernet3/0/1] arp
max-dynamic-entry 6000
Syntax
arp proxy enable
undo arp proxy enable
View
VLAN interface view
Parameter
None
Description
Use the arp proxy enable command to
enable ARP proxy.
Use the undo arp proxy enable
command to disable ARP proxy.
You can use the arp proxy enable command
to enable the switch to provide Layer 3 connectivity between hosts in different
VLANs on the switch.
By default, ARP proxy is disabled.
Related command: display arp proxy.
Example
# Enable ARP proxy on VLAN–interface
2.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] interface Vlan-interface 2
[H3C-Vlan-interface2] arp proxy
enable
Syntax
arp proxy source-vlan enable
undo arp proxy source-vlan enable
View
VLAN interface view
Parameter
None
Description
Use the arp proxy source-vlan enable
command to enable intra-VLAN ARP proxy, so that ARP proxy is able to process
intra-VLAN ARP requests to provide Layer 3 connectivity between Layer 2
isolated ports in the same VLAN.
Use the undo arp proxy source-vlan
enable command to disable intra-VLAN ARP proxy, so that ARP proxy only
processes inter-VLAN ARP requests instead of intra-VLAN ARP request.
By default, intra-VLAN ARP proxy is
disabled, and ARP proxy only processes inter-VLAN ARP requests after it is enabled.
Note that, intra-VLAN ARP proxy can be
enabled only after ARP proxy is enabled.
Related command: arp proxy enable, display
arp proxy.
Example
# With ARP proxy enabled, enable intra-VLAN
ARP proxy for VLAN 2.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] interface Vlan-interface 2
[H3C-Vlan-interface2] arp proxy
source-vlan enable
Syntax
arp source-suppression limit { total | local | through }
limit-value
undo arp source-suppression limit { total | local | through }
View
System view
Parameter
total: Sets
the maximum number of total arbitrary ARP packets that can be sent to the CPU
in a unit of time. (There is no limit on source and destination IP addresses in
ARP packets.)
local: Sets
the maximum number of locally-terminated ARP packets (packets having the same
source IP address and using the IP address of the current switch as their
destination IP address) that can be sent to the CPU in a unit of time.
through:
Sets the maximum number of pass-through ARP packets (packets having the same
source IP address and not using the IP address of the current switch as their
destination IP addresses) that can be sent to the CPU in a unit of time.
limit-value:
Maximum number of a type of ARP packets that can be sent to the CPU in a unit
of time. When local or total is adopted, this argument ranges
from 1 to 4294967295; when through is adopted, the value ranges from 0
to 4294967295.
Description
Use the arp source-suppression limit command
to set the maximum number of a type of ARP packets that can be sent to the CPU
in a unit of time.
Use the undo arp
source-suppression limit command to restore the default setting.
The default setting varies with the type of
ARP packets.
l
When total is adopted in the command, the
default setting is 100.
l
When local is adopted in the command, the
default setting is 3.
l
When through is adopted in the command,
the default setting is 3.
Make sure your setting for total is
greater than the settings for local and through.
Related command: display arp
source-suppression.
Example
# Configure to allow a maximum of 200 ARP
packets to be sent to the CPU totally.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] arp source-suppression limit
total 200
Syntax
arp static ip-address mac-address [ vlan-id
interface-type interface-number ]
undo arp ip-address
View
System view
Parameter
ip-address:
IP address for the ARP entry to be created/removed.
mac-address:
MAC address for the ARP entry to be created, in the format of H-H-H.
vlan-id: ID
of the VLAN to which the static ARP entry belongs, in the range of 1 to 4094.
interface-type: Type of the port to which the static ARP entry belongs.
interface-number: Number of the port to which the static ARP entry belongs.
Description
Use the arp static command to create
a static ARP entry in the ARP table.
Use the undo arp command to remove
an ARP entry.
By default, there is no static ARP entry in
the ARP table, and ARP entries are dynamically created by ARP.
Note that:
l
A static ARP entry keeps valid as long as the
Ethernet switch operates normally, unless it is removed as the result of some
operation like removing the VLAN of the entry. By default, a dynamic ARP entry
keeps valid for 20 minutes.
l
The VLAN specified by the vlan-id
argument in the arp static command must be an existing VLAN, and the
port specified by the interface-type and interface-number
arguments must belong to the VLAN.
Related command: reset arp, display
arp.
Example
# Create a static ARP entry belonging to
Ethernet1/0/1 in VLAN 1, with IP address 202.38.10.2 and MAC address
000f-e201-0000.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] arp static 202.38.10.2
000f-e201-0000 1 Ethernet 1/0/1
Syntax
arp timer aging aging-time
undo arp timer aging
View
System view
Parameter
aging-time:
Aging time for dynamic ARP entries. This argument ranges from 1 to 1,440 in
minutes.
Description
Use the arp timer aging command to
configure the aging time for dynamic ARP entries.
Use the undo arp timer aging command
to restore the default aging time.
By default, the aging time for dynamic ARP
entries is 20 minutes.
Related command: display arp timer aging.
Example
# Set the aging time for dynamic ARP
entries to 10 minutes.
<H3C> system-view
System View: return to User View with
Ctrl+Z.
[H3C] arp timer aging 10
1.1.9 display arp
Syntax
display arp
[ dynamic | static | ip-address ]
View
Any view
Parameter
dynamic:
Displays dynamic ARP entries.
static:
Displays static ARP entries.
ip-address:
IP address. The ARP entry containing this IP address will be displayed.
Description
Use the display arp command to
display ARP entries.
Executing this command without any
parameter will display all ARP entries.
Related command: arp static, reset
arp.
Example
# Display all ARP entries.
<H3C> display arp
Type: S-Static
D-Dynamic
IP Address MAC Address VLAN
ID Port Name / AL ID Aging Type
10.2.72.162 000a-000a-0aaa
N/A N/A N/A S
192.168.0.77 0000-e8f5-6a4a
1 Ethernet1/0/2 13 D
192.168.0.2 000d-88f8-4e88
1 Ethernet1/0/2 14 D
192.168.0.200 0014-222c-9d6a
1 Ethernet1/0/2 14 D
192.168.0.45 000d-88f6-44c1
1 Ethernet1/0/2 15 D
192.168.0.110 0011-4301-991e
1 Ethernet1/0/2 15 D
192.168.0.32 0000-e8f5-73ee
1 Ethernet1/0/2 16 D
192.168.0.3 0014-222c-aa69
1 Ethernet1/0/2 16 D
192.168.0.17 000d-88f6-379c
1 Ethernet1/0/2 17 D
192.168.0.115 000d-88f7-9f7d
1 Ethernet1/0/2 18 D
192.168.0.43 000c-760a-172d
1 Ethernet1/0/2 18 D
192.168.0.33 000d-88f6-44ba
1 Ethernet1/0/2 20 D
192.168.0.35 000f-e202-2181
1 Ethernet1/0/2 20 D
192.168.0.5 000f-3d80-2b38
1 Ethernet1/0/2 20 D
--- 14 entries found ---
Table 1-1 Description on the fields of
the display arp command
|
Field
|
Description
|
|
IP Address
|
IP address contained in an ARP entry
|
|
MAC Address
|
MAC address contained in the ARP entry
|
|
VLAN ID
|
ID of the VLAN to which the ARP entry
belongs
|
|
Port Name / AL ID
|
Index of the port to which the ARP entry
belongs
|
|
Aging
|
Aging time of the ARP entry if it is a
dynamic entry, in minutes
|
|
Type
|
Type of the ARP entry
|
1.1.10 display arp |
Syntax
display arp
| { begin | exclude | include } text
View
Any view
Parameter
begin:
Displays the ARP entries from the first ARP entry that contains the string
specified by the text argument.
exclude:
Displays the ARP entries that do not contain the string specified by the text
argument.
include:
Displays the ARP entries that contain the string specified by the text
argument.
text: String
used to filter ARP entries.
Description
Use the display arp | command to
display the ARP entries matching a specified rule.
Related command: arp static, reset
arp.
Example
# Display the
ARP entries that contain the string “77”.
<H3C> display arp | include 77
Type: S-Static
D-Dynamic
IP Address MAC Address VLAN
ID Port Name / AL ID Aging Type
192.168.0.77 0000-e8f5-6a4a
1 Ethernet1/0/2 12 D
--- 1 entry found ---
# Display the ARP entries that do not
contain the string “68”.
<H3C> display arp | exclude 68
Type: S-Static
D-Dynamic
IP Address MAC Address VLAN
ID Port Name / AL ID Aging Type
10.2.72.162 000a-000a-0aaa
N/A N/A N/A S
--- 1 entry found ---
See Table 1-1 for the description of the
output fields.
Syntax
display arp entry-limit
[ interface interface-type interface-number ]
View
Any view
Parameter
interface-type: Port type.
interface-number: Port number.
Description
Use the display arp entry-limit
command to display the number limits of ARP entries.
If you specify a port, the command will display
the total maximum number of ARP entries and the maximum number of dynamic ARP
entries on the port.
If you do not specify a port, the command
will display the total maximum number of ARP entries and the maximum number of
dynamic ARP entries on each port.
Example
# Display the current number limits of ARP
entries.
<H3C> display arp entry-limit
The maximum ARP entry number is 8192
The maximum dynamic ARP entry number
of the port GigabitEthernet0/0/1 is 2048
The maximum dynamic ARP entry number
of the port GigabitEthernet0/0/2 is 2048
The maximum dynamic ARP entry number
of the port GigabitEthernet0/0/3 is 2048
The maximum dynamic ARP entry number
of the port GigabitEthernet0/0/4 is 2048
The maximum dynamic ARP entry number
of the port GigabitEthernet3/0/1 is 6000
……
Syntax
display arp interface interface-type interface-number
View
Any view
Parameter
interface-type: Port type.
Interface-number: Port number.
Description
Use the display arp interface
command to display the ARP entries of a specified port.
Example
# Display the ARP entries of Ethernet3/0/1.
<H3C> display arp interface
ethernet 3/0/1
Type: S-Static
D-Dynamic
IP Address MAC Address VLAN ID
Port Name Aging Type
10.1.1.2 000f-e201-0102 1
Ethernet3/0/1 N/A S
Syntax
display arp proxy [ interface interface-type interface-number ]
View
Any view
Parameter
interface-type: Interface type.
interface-number: Interface number.
Description
Use the display arp proxy command to
display the status of ARP proxy (enabled/disabled).
Related command: arp proxy enable.
Example
# Display the status of ARP proxy on
VLAN–interface 2.
<H3C> display arp proxy
interface Vlan-interface 2
Interface Vlan-interface2
Proxy ARP status: disabled
Syntax
display arp slot slot-id
View
Any view
Parameter
slot-id: ID
of a slot.
Description
Use the display
arp slot command to display the ARP entries of all ports on the specified
slot.
Example
# Display the ARP entries on the third
slot.
<H3C> display arp slot 3
Type: S-Static
D-Dynamic
IP Address MAC Address VLAN ID
Port Name Aging Type
10.1.1.2 000f-e201-0102 1
Ethernet3/0/1 N/A S
Syntax
display arp source-suppression
View
Any view
Parameter
None
Description
Use the display arp source-suppression command
to display the ARP source suppression configuration on the current switch.
Example
# Display the ARP source suppression
configuration on the current switch.
<H3C> display arp
source-suppression
ARP suppression limit total:
4294967295
ARP suppression limit local: 3
ARP suppression limit through: 3
Syntax
display arp vlan vlan-id
View
Any view
Parameter
vlan-id:
VLAN ID.
Description
Use the display arp vlan command to
display the ARP entries of all ports in a specified VLAN.
Example
# Display the ARP entries of VLAN 1.
<H3C> display arp vlan 1
Type: S-Static
D-Dynamic
IP Address MAC Address VLAN ID
Port Name Aging Type
10.1.1.2 000f-e201-0102 1
Ethernet3/0/1 N/A S
Syntax
display arp timer aging
View
Any view
Parameter
None
Description
Use the display arp timer aging
command to display the setting for ARP aging timer.
Related command: arp timer aging.
Example
# Display the setting for ARP aging timer.
<H3C> display arp timer aging
Current ARP aging time is 20
minute(s)(default)
The above information shows that the time
for ARP aging timer is 20 minutes.
Syntax
gratuitous-arp-learning enable
undo gratuitous-arp-learning enable
View
System view
Parameter
None
Description
Use the gratuitous-arp-learning enable
command to enable gratuitous ARP learning.
Use the undo gratuitous-arp-learning
enable command to disable gratuitous ARP learning.
By default, gratuitous ARP learning is
disabled.
With gratuitous ARP learning enabled, a
switch operates as follows when receiving a gratuitous ARP packet:
If an ARP entry in the cache matches the
packet, the switch updates the ARP entry using the sender hardware address
carried in the gratuitous ARP packet.
If no ARP entry in the cache matches the
packet, an ARP entry corresponding to the packet is added to the cache.
Example
# Enable gratuitous ARP learning on the
switch named H3CA.
<H3CA> system-view
System View: return to User View with
Ctrl+Z.
[H3CA] gratuitous-arp-learning enable
Syntax
reset arp
[ dynamic | static | interface interface-type
interface-number ]
View
User view
Parameter
dynamic:
Clears dynamic ARP entries.
static:
Clears static ARP entries.
interface-type: Port type.
interface-number: Port number.
Description
Use the reset arp command to clear
ARP entries.
Related command: arp static, display
arp.
Example
# Clear static ARP entries.
<H3C> reset arp static
