H3C Technologies H3C S5120 Series Switches - Manual (Page 227)

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[Switch] interface GigabitEthernet 1/0/1
[Switch-GigabitEthernet1/0/1] port access vlan 10
[Switch-GigabitEthernet1/0/1] quit
# Create interface VLAN-interace 10 and configure its IP address.
[Switch] interface vlan-interface 10
[Switch-vlan-interface10] ip address 192.168.1.2 8
[Switch-vlan-interface10] quit
# Configure a static ARP entry with IP address 192.168.1.1 and MAC address 00e0-fc01-0000. The
outgoing interface corresponding to the static ARP entry is GigabitEthernet 1/0/1 belonging to VLAN 10.
[Switch] arp static 192.168.1.1 00e0-fc01-0000 10 GigabitEthernet 1/0/1
# View information about static ARP entries.
[Switch] display arp static
Type: S-Static D-Dynamic
IP Address MAC Address VLAN ID Interface Aging Type
192.168.1.1 00e0-fc01-0000 10 GE1/0/1 N/A S
Configuring Gratuitous ARP
Introduction to Gratuitous ARP
In a gratuitous ARP packet, the sender IP address and the target IP address are both the IP address of
the device issuing the packet, the sender MAC address is the MAC address of the device, and the target
MAC address is the broadcast address ff:ff:ff:ff:ff:ff.
A device implements the following functions by sending gratuitous ARP packets:
z Determining whether its IP address is already used by another device.
z Informing other devices about the change of its MAC address so that they can update their ARP
entries.
A device receiving a gratuitous ARP packet adds the information carried in the packet to its own
dynamic ARP table if it finds no corresponding ARP entry exists in the cache.
Configuring Gratuitous ARP
Follow these steps to configure gratuitous ARP:
To do… Use the command… Remarks
Enter system view system-view —
Enable the device to send
gratuitous ARP packets when
receiving ARP requests from
another network segment
gratuitous-arp-sending
enable
Required
By default, a device cannot
send gratuitous ARP packets
when receiving ARP requests
from another network segment.
Enable the gratuitous ARP
packet learning function gratuitous-arp-learning
enable Optional
Enabled by default.