Configuring Gratuitous Arp; Introduction To Gratuitous Arp - H3C S5500-SI Series Operation Manual

Operation Manual – ARP
H3C S5500-SI Series Ethernet Switches
Add an ARP entry, with the IP address being 192.168.1.1, the MAC address being
00e0-fc01-0000, and the outbound interface being GigabitEthernet1/0/2 of VLAN
10.
II. Configuration procedure
<Sysname> system-view
[Sysname] arp check enable
[Sysname] arp timer aging 10
[Sysname] vlan 10
[Sysname-vlan10] quit
[Sysname] interface vlan-interface 10
[Sysname- vlan-interface10] quit
[Sysname] interface GigabitEthernet 1/0/2
[Sysname-GigabitEthernet1/0/2] port access vlan 10
[Sysname-GigabitEthernet1/0/2] quit
[Sysname] arp static 192.168.1.1 00e0-fc01-0000 10 GigabitEthernet1/0/2

1.3 Configuring Gratuitous ARP

1.3.1 Introduction to Gratuitous ARP

A gratuitous ARP packet is a special ARP packet, in which the source IP address and
destination IP address are both the IP address of the sender.
A device can implement the following functions by sending gratuitous ARP packets:
Determining whether its IP address is already used by another device.
Informing other devices of its MAC address change so that they can update their
ARP entries.
A device receiving a gratuitous ARP packet can add the information carried in the
packet to its own dynamic ARP mapping table if it finds no corresponding ARP entry for
the ARP packet in the cache.
1.3.2 Configuring Gratuitous ARP
Follow these steps to configure gratuitous ARP:
Enter system view
Enable the device to send
gratuitous ARP packets
To do...
system-view
gratuitous-arp-sending
enable
Use the command...
1-6
Chapter 1 ARP Configuration
Remarks
—
Optional
A device cannot send
gratuitous ARP packets
by default.