H3C Technologies H3C S7500E Series Switches - Manual (Page 16)

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z A non-permanent static ARP entry has only an IP address and a MAC address configured. It
cannot be directly used for forwarding data. If a non-permanent static ARP entry matches an IP
packet to be forwarded, the device sends an ARP request first. If the sender IP and MAC
addresses in the received ARP reply are the same as those in the non-permanent static ARP
entry, the device adds the interface receiving the ARP reply to the non-permanent static ARP
entry. Then the entry can be used for forwarding IP packets.
z Usually ARP dynamically resolves IP addresses to MAC addresses, without manual intervention.
z To allow communication with a device using a fixed IP-to-MAC mapping, configure a
non-permanent static ARP entry for it. To allow communication with a device through a specific
interface and using a fixed IP-to-MAC mapping, configure a permanent static ARP entry for it.
Configuring ARP
Configuring a Static ARP Entry
A static ARP entry is effective when the device works normally. However, when a VLAN or VLAN
interface to which a static ARP entry corresponds is deleted, the entry, if permanent, will be deleted,
and if non-permanent and resolved, will become unresolved.
Follow these steps to configure a static ARP entry:
To do… Use the command… Remarks
Enter system view system-view —
Configure a permanent
static ARP entry
arp static ip-address mac-address
vlan-id interface-type
interface-number [ vpn-instance
vpn-instance-name ]
Required
No permanent static ARP entry is
configured by default.
Configure a
non-permanent static ARP
entry
arp static ip-address mac-address
[ vpn-instance
vpn-instance-name ]
Required
No non-permanent static ARP entry is
configured by default.