Configuration Guidelines; Configuration Procedure; Enabling Ip Conflict Notification - HP 3600 v2 Series Configuration Manual

If the virtual IP address of the VRRP group is associated with a virtual MAC address, the sender
MAC address in the gratuitous ARP packet takes the virtual MAC address of the virtual router. If the
virtual IP address of the VRRP group is associated with the real MAC address of an interface, the
sender MAC address in the gratuitous ARP packet takes the MAC address of the interface on the
master router in the VRRP group.
For more information about VRRP, see High Availability Configuration Guide.

Configuration guidelines

Follow these guidelines when you configure gratuitous ARP:
You can enable periodic sending of gratuitous ARP packets in VLAN interface view or Layer 3
•
Ethernet port view.
You can enable periodic sending of gratuitous ARP packets on a maximum of 1024 interfaces.
•
Periodic sending of gratuitous ARP packets takes effect only when the link of the enabled interface
•
goes up and an IP address has been assigned to the interface.
• If you change the interval for sending gratuitous ARP packets, the configuration is effective at the
next sending interval.
The frequency of sending gratuitous ARP packets might be much lower than is expected if this
•
function is enabled on multiple interfaces, if each interface is configured with multiple secondary IP
addresses, or if a small sending interval is configured in such cases.

Configuration procedure

To configure gratuitous ARP:
Step
1. Enter system view.
2. Enable learning of gratuitous
ARP packets.
3. Enable the device to send
gratuitous ARP packets upon
receiving ARP requests from
another subnet.
4. Enter interface view.
5. Enable periodic sending of
gratuitous ARP packets and set
the sending interval.

Enabling IP conflict notification

If the sender IP address of a received gratuitous ARP packet is being used by the receiving device, by
default, the receiving device sends a gratuitous ARP request, and it displays an error message after it
receives an ARP reply. The receiving device repeats the default processing 5 seconds after displaying
the error message, and it stops the processing when the conflict is resolved.
Command
system-view
gratuitous-arp-learning
enable
gratuitous-arp-sending
enable
interface interface-type
interface-number
arp send-gratuitous-arp
[ interval milliseconds ]
12
Remarks
N/A
Optional.
Enabled by default.
By default, a device does not send
gratuitous ARP packets upon
receiving ARP requests from another
subnet.
N/A
Disabled by default.