HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 3 - IP Services Conf - Page 12

Configuring the maximum number of dynamic ARP entries for an interface, Setting the aging timer

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Configuring the maximum number of dynamic ARP entries for an interface An interface can dynamically learn ARP entries, so it may hold too many ARP entries. To solve this problem, you can set the maximum number of dynamic ARP entries that an interface can learn. When the maximum number is reached, the interface stops learning ARP entries. A Layer 2 interface can learn an ARP entry only when both its maximum number and the VLAN interface's maximum number are not reached. To set the maximum number of dynamic ARP entries that an interface can learn: Step 1. Enter system view. 2. Enter Ethernet interface view. Command system-view interface interface-type interface-number 3. Set the maximum number of dynamic ARP entries that the interface can learn. arp max-learning-num number Remarks N/A N/A Optional. By default, a Layer 2 interface does not limit the number of dynamic ARP entries. A Layer 3 interface can learn up to 4096 dynamic ARP entries. If the value of the number argument is set to 0, the interface is disabled from learning dynamic ARP entries. Setting the aging timer for dynamic ARP entries Each dynamic ARP entry in the ARP table has a limited lifetime, called 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. To set the age timer for dynamic ARP entries: Step Command 1. Enter system view. system-view 2. Set the age timer for dynamic ARP entries. arp timer aging aging-time Remarks N/A Optional. 20 minutes by default. Enabling dynamic ARP entry check The dynamic ARP entry check function controls whether the device supports dynamic ARP entries with multicast MAC addresses. When dynamic ARP entry check is enabled, the device cannot learn dynamic ARP entries containing multicast MAC addresses. 4

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4
Configuring the maximum number of dynamic ARP
entries for an interface
An interface can dynamically learn ARP entries, so it may hold too many ARP entries. To solve this
problem, you can set the maximum number of dynamic ARP entries that an interface can learn. When the
maximum number is reached, the interface stops learning ARP entries.
A Layer 2 interface can learn an ARP entry only when both its maximum number and the VLAN
interface's maximum number are not reached.
To set the maximum number of dynamic ARP entries that an interface can learn:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Enter Ethernet interface view.
interface
interface-type
interface-number
N/A
3.
Set the maximum number of
dynamic ARP entries that the
interface can learn.
arp max-learning-num
number
Optional.
By default, a Layer 2 interface does not
limit the number of dynamic ARP entries.
A Layer 3 interface can learn up to
4096 dynamic ARP entries.
If the value of the
number
argument is set
to 0, the interface is disabled from
learning dynamic ARP entries.
Setting the aging timer for dynamic ARP entries
Each dynamic ARP entry in the ARP table has a limited lifetime, called 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.
To set the age timer for dynamic ARP entries:
Step
Command
Remarks
1.
Enter system view.
system-view
N/A
2.
Set the age timer for dynamic
ARP entries.
arp timer aging
aging-time
Optional.
20 minutes by default.
Enabling dynamic ARP entry check
The dynamic ARP entry check function controls whether the device supports dynamic ARP entries with
multicast MAC addresses.
When dynamic ARP entry check is enabled, the device cannot learn dynamic ARP entries containing
multicast MAC addresses.