Configuring Gratuitous Arp - 3Com E4500-24 Cli Configuration Manual

To do...
Enable the ARP entry checking
function (that is, disable the
switch from learning ARP
entries with multicast MAC
addresses)
Static ARP entries are valid as long as the Ethernet switch operates normally. But some operations,
such as removing a VLAN, or removing a port from a VLAN, will make the corresponding ARP
entries invalid and therefore removed automatically.
As for the arp static command, the value of the vlan-id argument must be the ID of an existing
VLAN, and the port identified by the interface-type and interface-number arguments must belong to
the VLAN.
Currently, static ARP entries cannot be configured on the ports of an aggregation group.

Configuring Gratuitous ARP

Follow these steps to configure gratuitous ARP:
To do...
Enter system view
Enable the gratuitous ARP
packet learning function
Enter VLAN interface view
Enable the VLAN interface to
send gratuitous ARP packets
periodically
The sending of gratuitous ARP packets is enabled as long as an S4500 switch operates. No command
is needed for enabling this function. That is, the device sends gratuitous ARP packets whenever a
VLAN interface is enabled (such as when a link is enabled or an IP address is configured for the VLAN
interface) or whenever the IP address of a VLAN interface is changed.
Use the command...
arp check enable
Use the command...
system-view
gratuitous-arp-learning
enable
interface Vlan-interface
vlan-id
gratuitous-arp
period-sending enable
1-5
Remarks
Optional
Enabled by default.
Remarks
—
Optional
Disabled by default.
—
Optional
Enabled by default.