1-5
z 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.
z 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.
z 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… Use the command… Remarks
Enter system view
system-view
—
Enable the gratuitous ARP
packet learning function
gratuitous-arp-learning
enable
Optional
Enabled by default.
The sending of gratuitous ARP packets is enabled as long as an S4200G 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.
Displaying and Debugging ARP
To do… Use the command… Remarks
Display specific ARP mapping
table entries
display arp [ static | dynamic | ip-address ]
Display the ARP mapping
entries related to a specified
string in a specified way
display arp [ dynamic | static ] | { begin |
include | exclude } regular-expression
Display the number of the ARP
entries of a specified type
display arp count [ [ dynamic | static ] [ |
{ begin | include | exclude }
regular-expression ] | ip-address ]
Display the statistics about the
untrusted ARP packets
dropped by the specified port
display arp detection statistics interface
interface-type interface-number
Display the setting of the ARP
aging timer
display arp timer aging
Available in
any view
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