arp max-learning-num
Use arp max-learning-num to set the dynamic ARP learning limit for an interface.
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 following matrix shows the default value for the dynamic ARP learning limit:
Hardware | ARP learning limit on an interface | |
|---|---|---|
HPE 12900E switch series | FE cards HF cards | The limit depends on the ARP table capacity set by using the hardware-resource tcam command. For information about this command, see Fundamentals Command Reference. |
Other F cards | 16000 | |
Other H cards | 48000 | |
HPE 12900 switch series | FE cards | The limit depends on the ARP table capacity set by using the hardware-resource tcam command. For information about this command, see Fundamentals Command Reference. |
Other cards | 16000 | |
HPE 7900 switch series | 16000 | |
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
mdc-admin
Parameters
max-number: Specifies the maximum number of dynamic ARP entries for an interface. The following matrix shows the value range for the max-number argument:
Hardware | Value range | |
|---|---|---|
HPE 12900E switch series | FE cards HF cards | 0 to n. The value for n depends on the ARP table capacity set by using the hardware-resource tcam command. |
Other F cards | 0 to 16000 | |
Other H cards | 0 to 48000 | |
HPE 12900 switch series | FE cards | 0 to n. The value for n depends on the ARP table capacity set by using the hardware-resource tcam command. |
Other cards | 0 to 16000 | |
HPE 7900 switch series | 0 to 16000 | |
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 FortyGigE 1/0/1 to learn a maximum of 10 dynamic ARP entries.
<Sysname> system-view [Sysname] interface fortygige 1/0/1 [Sysname-FortyGigE1/0/1] 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