Filter
Top Products
276 CHAPTER 17: NETWORK PROTOCOL OPERATION
By sending gratuitous ARP packets, a network device can:
■ Determine whether or not IP address conflicts exist between it and other network
devices.
■ Trigger other network devices to update its hardware address stored in their
caches.
When the gratuitous ARP packet learning function is enabled on a device and the
device receives a gratuitous ARP packet, the device updates the corresponding ARP
entry (if available in the cache of the switch) using the hardware address of the sender
carried in the gratuitous ARP packet. A device operates like this whenever it receives a
gratuitous ARP packet.
Gratuitous ARP Packet
Learning Configuration
This section contains configuration information on Gratuitous ARP Packet Learning.
Configuring Gratuitous ARP Packet Sending
Gratuitous ARP packet sending is enabled as long as a Switch 5500 operates. And no
command is for this function.
Configuring the Gratuitous ARP Packet Learning
Table 272 describes the procedure to configure the gratuitous ARP packet learning
function.
Displaying and Debugging ARP
After the above configuration, enter the
display command in any view to display the
running of the ARP configuration, and to verify the effect of the configuration. Enter
the
debugging command in User View to debug ARP configuration. Enter the reset
command in User View to clear ARP mapping table.
Table 272 Configure the gratuitous ARP packet learning function
Operation Command Description
Enter system view system-view -
Enable the gratuitous ARP
packet learning function
gratuitous-arp-learni
ng enable
Required
By default, the gratuitous ARP packet
learning function is enabled.
Table 273 Displaying and Debugging ARP
Operation Command
Display the ARP mapping table display arp [ ip_address | [ dynamic | static ] [
| { begin | include | exclude } text ] ]
Display the current setting of the
dynamic ARP map aging timer
display arp timer aging
Reset the ARP mapping table reset arp [ dynamic | static | interface {
interface_type interface_num |
interface_name } ]
Enable ARP information debugging debugging arp packet
Disable ARP information debugging undo debugging arp packet