H3C Technologies H3C S12500 Series Switches - Manual (Page 18)

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Configuring the maximum number of dynamic ARP
entries
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.
The 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 interface view.
interface interface-type
interface-number
N/A
3. Set the maximum number of
dynamic ARP entries.
arp max-learning-num number
By default, the maximum number of
dynamic ARP entries that an interface
can learn is the maximum remaining
resource of the switch.
If the value of the number argument is set
to 0, the interface is disabled from
learning dynamic ARP entries.
27B
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. A dynamic ARP entry that is not
updated before its aging timer expires is deleted from the ARP table.
To set the aging timer for dynamic ARP entries:
Step Command Remarks
1. Enter system view. system-view N/A
2. Set the aging timer for dynamic ARP
entries.
arp timer aging aging-time
By default, the aging time for
dynamic ARP entries is 20 minutes.
28B
Enabling dynamic ARP entry check
The dynamic ARP entry check function controls whether the device supports dynamic ARP entries
containing multicast MAC addresses.
When dynamic ARP entry check is enabled, the device cannot learn dynamic ARP entries containing
multicast MAC addresses, and you cannot manually add static ARP entries containing multicast MAC
addresses.