D-Link xStack DGS-3120 Series Cli Reference Manual page 426

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xStack DGS-3120 Series Layer 3 Managed Gigabit Ethernet Switch CLI Reference Guide
39-2 config gratuitous_arp send dup_ip_detected
Description
The command is used to enable or disable the sending of gratuitous ARP request packet while
duplicate IP is detected. The duplicate IP detected means that the system received an ARP
request packet that is sent by an IP address that matches the system's own IP address. In this
case, the system knows that some body out there uses an IP address that is conflict with the
system. In order to reclaim the correct host of this IP address, the system can send out the
gratuitous ARP request packet for this duplicate IP address.
Format
config gratuitous_arp send dup_ip_detected [enable | disable]
Parameters
enable - Enable sending of gratuitous ARP when duplicate IP is detected.
disable - Disable sending of gratuitous ARP when duplicate IP is detected. This is the default
value.
Restrictions
Only Administrator, Operator and Power-User level users can issue this command.
Example
To enable send gratuitous ARP request when duplicate IP is detected:
DGS-3120-24TC:admin# config gratuitous_arp send dup_ip_detected enable
Command: config gratuitous_arp send dup_ip_detected enable
Success.
DGS-3120-24TC:admin#
39-3 config gratuitous_arp learning
Description
This command is used to configure gratuitous ARP learning. Normally, the system will only learn
the ARP reply packet or a normal ARP request packet that asks for the MAC address that
corresponds to the system's IP address. The command is used to enable/disable learning of ARP
entry in ARP cache based on the received gratuitous ARP packet. The gratuitous ARP packet is
sent by a source IP address that is identical to the IP that the packet is queries for. Note that, with
the gratuitous ARP learning, the system will not learn new entry but only do the update on the ARP
table based on the received gratuitous ARP packet. By default, the state is disabled status.
Format
config gratuitous_arp learning [enable | disable]
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