H3C S7500 Series Ethernet Switches Operation Manual

Operation Manual – ARP
H3C S7500 Series Ethernet Switches Chapter 1
ARP Configuration
1-9
To do… Use the command… Remarks
Enter system view
system-view
—
Enable gratuitous ARP
packets to be sent
periodically
arp gratuitous-updating
enable
Required
By default, this function is
disabled on the switch.
Set a gratuitous ARP
update interval
arp timer
gratuitous-updating
updating-interval
Optional
The gratuitous ARP
update interval defaults to
five minutes after this
function is enabled.
 Note:
With VRRP enabled on a VLAN interface of a switch:
z If the switch is the master switch, it sends gratuitous ARP messages with the IP
address of the VRRP virtual router.
z If it is not the master switch, it sends gratuitous ARP messages with the primary and
all the secondary IP addresses of the VLAN interface.
1.2.7 Configuring Gratuitous ARP Learning
Follow these steps to enable gratuitous ARP learning:
To do… Use the command… Remarks
Enter system view
system-view
—
Enable gratuitous ARP
learning
gratuitous-arp-learning
enable
Required
Disabled by default.
1.2.8 Configuring ARP Attack Detection
Follow these steps to configure ARP attack detection:
To do… Use the command… Remarks
Enter system view
system-view
—
Set the maximum number
of IP addresses to be
bound to a MAC address
in a VLAN
arp mac-arp-map limit
number
Required
By default, the maximum
number is 2.