Configuring Arp - 3Com Switch 7700 Configuration Manual

Configuring ARP

The ARP mapping table can be maintained dynamically or manually. Addresses
that are mapped manually are referred to as static ARP. The user can display, add,
or delete the entries in the ARP mapping table through manual commands.
ARP configuration includes tasks described in the following sections:
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Manually Adding/Deleting Static ARP Mapping Entries
Perform the following configuration in System view.
Table 4 Manually Adding/Deleting Static ARP Mapping Entries
Operation
Manually add a static ARP mapping entry
Manually delete a static ARP mapping entry
Static ARP mapping entries will not time out, however dynamic ARP mapping
entries time out after 20 minutes.
The ARP mapping table is empty and the address mapping is obtained through
dynamic ARP by default.
Learning Gratuitous ARPs
Perform the following configuration in System view.
Table 5 Learning Gratuitous ARPs
Operation
Enable the switch to learn gratuitous ARPs
Prevent the switch from learning gratuitous
ARPs
By default, the switch does not learn gratuitous ARPs.
Configuring the Dynamic ARP Aging Timer
The following commands assign a dynamic ARP aging period to enable flexible
configurations. When the system learns a dynamic ARP entry, its aging period is
based on the currently configured value.
Perform the following configuration in system view.
Table 6 Configure the Dynamic ARP Aging Timer
Operation
Configure the dynamic ARP aging timer
Restore the default dynamic ARP aging time
By default, the aging time of the dynamic ARP aging timer is 20 minutes.
Manually Adding/Deleting Static ARP Mapping Entries
Learning Gratuitous ARPs
Configuring the Dynamic ARP Aging Timer
Displaying and Debugging ARP
Configuring Address Resolution Protocol (ARP)
Command
arp static ip-address mac-address VLANID {
interface_type interface_num | interface_name
}
undo arp static ip-address
Command
gratuitous-arp-learning enable
undo gratuitous-arp-learning enable
Command
arp timer aging aging-time
undo arp timer aging
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