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secondary IP addresses of the gateway, so the receiving hosts can update ARP entries in a
timely manner.
Gratuitous ARP tasks at a glance
All gratuitous ARP tasks are optional. If all of the following features are disabled, gratuitous ARP still
provides the IP conflict detection function.
• Enabling IP conflict notification
• Enabling gratuitous ARP packet learning
• Enabling periodic sending of gratuitous ARP packets
• Enabling sending gratuitous ARP packets for ARP requests with sender IP address on a
dif
ferent subnet
• Configuring gratuitous ARP packet retransmissio
n for the device MAC address change
Enabling IP conflict notification
About IP conflict notification
Upon detecting an IP conflict, the device will sends a gratuitous ARP request. By default, the device
displays an error message only after it receives an ARP reply. You can enable this feature to allow
the device to display an error message immediately upon detecting an IP conflict.
Procedure
1. Enter system view.
system-view
2. Enable IP conflict notification.
arp ip-conflict log prompt
By default, IP conflict notification is disabled.
Enabling gratuitous ARP packet learning
1. Enter system view.
system-view
2. Enable gratuitous ARP packet learning.
gratuitous-arp-learning enable
By default, gratuitous ARP packet learning is enabled.
Enabling periodic sending of gratuitous ARP
packets
Restrictions and guidelines
• You can enable periodic sending of gratuitous ARP packets on a maximum of 1024 interfaces.
• Periodic sending of gratuitous ARP packets takes effect on an interface only when the following
conditions are met:
{ The data link layer state of the interface is up.
{ The interface has an IP address.
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