D-Link DGS-1510-52X User Manual - Page 281
Command Default Level, Usage Guideline, Example, 3 arp gratuitous-send, Parameters, Default, Command
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DGS-1510 Series Gigabit Ethernet SmartPro Switch CLI Reference Guide Command Default Level Level: 12. Usage Guideline A gratuitous ARP request packet is an ARP request packet where the source and the destination IP address are both set to the IP address of the sending device and the destination MAC address is the broadcast address. Generally, a device use the gratuitous ARP request packet to discover whether the IP address is duplicated by other hosts or to preload or reconfigure the ARP cache entry of hosts connected to the interface. Use the ip gratuitous-arps command to enable transmission of gratuitous ARP request. The device will send out the packet when an IP interface becomes link-up or when the IP address of an interface is configured or modified. Use the ip gratuitous-arps dad-reply command to enable the transmission of gratuitous ARP requests. The device will send out the packet while a duplicate IP address is detected Example This example shows how to sending of gratuitous ARP messages. Switch# configure terminal Switch(config)# ip gratuitous-arps dad-reply switch(config)# 31-3 arp gratuitous-send This command is used to set the interval for regularly sending of gratuitous ARP request messages on the interface. Use no command to disable this function on the interface. arp gratuitous-send interval SECONDS no arp gratuitous-send Parameters SECONDS Specifies the time interval to send the gratuitous ARP request message in the range from 1 to 3600 seconds. Default By default, this option is disabled. Command Mode Interface Configuration Mode. Command Default Level Level: 12. Usage Guideline If an interface on the Switch is used as the gateway of its downlink devices and counterfeit gateway behavior occurs in the downlink devices, administrators can configure to send gratuitous ARP request messages regularly on this interface to notify that the Switch is the real gateway. Example This example shows how to enable the sending of gratuitous ARP messages. 278
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