Gratuitous Arp; Configuring Arp Entries; Displaying Arp Entries; Creating A Static Arp Entry - HP FlexNetwork NJ5000 User Manual

Gratuitous ARP

In a gratuitous ARP packet, the sender IP address and the target IP address are the IP address of
the sending device, the sender MAC address is the MAC address of the sending device, and the
target MAC address is the broadcast address ff:ff:ff:ff:ff:ff.
A device sends a gratuitous ARP packet for either of the following purposes:
•
Determine whether its IP address is already used by another device. If the IP address is already
used, the device is informed of the conflict by an ARP reply.
•
Inform other devices of a MAC address change.
Gratuitous ARP packet learning
This feature enables a device to create or update ARP entries by using the sender IP and MAC
addresses in received gratuitous ARP packets.
When this feature is disabled, the device uses the received gratuitous ARP packets to update
existing ARP entries only.

Configuring ARP entries

Displaying ARP entries

From the navigation tree, select Network > ARP Management. The default ARP Table page
appears, as shown in
This page displays all ARP entries.
Figure 195 ARP Table configuration page

Creating a static ARP entry

From the navigation tree, select Network > ARP Management.
1.
The default ARP Table page appears, as shown in
Click Add.
2.
The New Static ARP Entry page appears.
Figure 195.
196
Figure 195.