3Com Switch 7750 Series
Command Reference Guide – ARP Chapter 1 ARP Configuration Commands
1-14
Description
Use the gratuitous-arp-learning enable command to enable the gratuitous ARP
packet learning function.
Use the undo gratuitous-arp-learning enable command to disable the gratuitous
ARP packet learning function.
By default, the gratuitous ARP packet learning function is enabled.
With the gratuitous ARP packet learning function enabled, a switch operates as follows
when receiving a gratuitous ARP packet:
If the cache of the switch contains ARP mapping entries that match the packet, the
switch updates the ARP mapping entries using the sender hardware address carried in
the gratuitous ARP packet.
If no ARP mapping entry in the cache matches the packet, an ARP mapping entry
corresponding to the packet is created.
Example
# Enable the gratuitous ARP packet learning function on the switch named 3ComA.
<3ComA> system-view
System View: return to User View with Ctrl+Z.
[3ComA] gratuitous-arp-learning enable
1.1.19 reset arp Syntax
reset arp [ dynamic | static | interface interface-type interface-number ]
View
User view
Parameter
dynamic: Clears dynamic ARP mapping entries.
static: Clears static ARP mapping entries.
interface-type: Port type.
interface-number: Port number.
Description
Use the reset arp command to clear specific ARP mapping entries.
Related command: arp static, display arp.