Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 655)

IP Addressing and Protocol Commands
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 25.21
ip gratuitous-arp-link
This command sets the Gratuitous ARP time limit for all switchports. The time limit
restricts the sending of Gratuitous ARP packets to one Gratuitous ARP packet within the
time in seconds.
Syntax ip gratuitous-arp-link <0-300>
no ip gratuitous-arp-link
Default The default Gratuitous ARP time limit for all switchports is 8 seconds.
Mode Global Configuration
Usage Every switchport will send a sequence of 3 Gratuitous ARP packets to each VLAN that the
switchport is a member of, whenever the switchport moves to the forwarding state. The
first Gratuitous ARP packet is sent 1 second after the switchport becomes a forwarding
switchport. The second and third Gratuitous ARP packets are each sent after the time
period specified by the Gratuitous ARP time limit.
Additionally, the Gratuitous ARP time limit specifies the minimum time between the end
of one Gratuitous ARP sequence and the start of another Gratuitous ARP sequence. When
a link is flapping, the switchport’s state is set to forwarding several times. The Gratuitous
ARP time limit is imposed to prevent Gratuitous ARP packets from being sent undesirably
often.
Examples To disable the sending of Gratuitous ARP packets, use the commands:
To restrict the sending of Gratuitous ARP packets to one every 20 seconds, use the
commands:
Validation
Commands
show running-config
Note This command specifies time between sequences of Gratuitous ARP packets,
and time between individual Gratuitous ARP packets occurring in a sequence,
to allow legacy support for older devices and interoperation between other
devices that are not ready to receive and forward data until several seconds
after linkup.
Additionally, jitter has been applied to the delay following linkup, so Gratuitous
ARP packets applicable to a given port are spread over a period of 1 second so
are not all sent at once. Remaining Gratuitous ARP packets in the sequence
occur after a fixed delay from the first one.
Parameter Description
<0-300> Specify the minimum time between sequences of Gratuitous ARPs and
the fixed time between Gratuitous ARPs occurring in a sequence, in
seconds.
0 disables the sending of Gratuitous ARP packets.
The default is 8 seconds.
awplus# configure terminal
awplus(config)# ip gratuitous-arp-link 0
awplus# configure terminal
awplus(config)# ip gratuitous-arp-link 20