H3C Technologies H3C S7500E Series Switches - Manual (Page 17)

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z The vlan-id argument must be the ID of an existing VLAN which corresponds to the ARP entries.
In addition, the Ethernet interface following the argument must belong to that VLAN. A VLAN
interface must be created for the VLAN.
z 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.
Configuring the Maximum Number of ARP Entries for an Interface
Follow these steps to set the maximum number of dynamic ARP entries that an interface can learn:
To do… Use the command… Remarks
Enter system view system-view —
Enter Ethernet interface view
interface interface-type
interface-number
—
Set the maximum number of
dynamic ARP entries that an
interface can learn
arp max-learning-num number
Optional
8192 by default
Setting the Aging Time for Dynamic ARP Entries
To keep pace with the network changes, the ARP table is refreshed. Each dynamic ARP entry in the
ARP table has an aging time rather than is always valid. Dynamic ARP entries that are not refreshed
before expiration are deleted from the ARP table. The aging time is reset each time the dynamic ARP
entry is refreshed. You can adjust the aging time for dynamic ARP entries according to the actual
network condition.
Follow these steps to set the aging time for dynamic ARP entries:
To do… Use the command… Remarks
Enter system view system-view —
Set the aging time for dynamic
ARP entries
arp timer aging aging-time
Optional
20 minutes by default.
Enabling the ARP Entry Check
The ARP entry check function controls the device to support static ARP entries with multicast MAC
addresses.