H3C Technologies H3C S5120 Series Switches - Manual (Page 225)

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To do… Use the command… Remarks
Configure a permanent
static ARP entry
arp static ip-address
mac-address vlan-id
interface-type interface-number Required
No permanent static ARP entry is
configured by default.
Configure a
non-permanent static
ARP entry
arp static ip-address
mac-address
Required
No non-permanent static ARP entry is
configured by default.
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
256 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 a limited lifetime rather than is always valid. Dynamic ARP entries that are not refreshed
before expiration are deleted from the ARP table. The lifetime is called the aging time. The aging time is
reset each time the dynamic ARP entry is refreshed within the lifetime. 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.