3Com SuperStack 4 Configuration Manual page 77

Table 80 Manually Adding/Deleting Static ARP Mapping Entries
Operation
Manually add a static ARP
mapping entry (Ethernet Port
View)
Manually delete a static ARP
mapping entry (System View or
Ethernet Port View)
By default, the ARP mapping table is empty and the address mapping is obtained
through dynamic ARP.
Note that:
Static ARP map entry will be always valid as long as the Ethernet Switch works
■
normally. But if the VLAN corresponding to the ARP mapping entry is deleted,
the ARP mapping entry will be also deleted. The valid period of dynamic ARP
map entries will last only 20 minutes by default.
The parameter
vlan-id
■
user, and the Ethernet port specified behind this parameter must belong to the
VLAN.
The aggregation port or port with LACP enabled cannot be set as the egress
■
port of static ARP.
Configuring the Dynamic ARP Aging Timer
For purpose of flexible configuration, the system provides the following
commands to assign dynamic ARP aging period. When the system learns a
dynamic ARP entry, its aging period is based on the current value configured.
Perform the following configuration in System View.
Table 81 Configuring 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.
Configuring the Creation of ARP Entries for Multicast Packets
Use the following command to specify whether the Switch should create ARP
table entries for multicast MAC addresses. Address resolution, for multicast
packets, is not required because the IANA (Internet Assigned Numbers Authority)
have reserved a block of Ethernet addresses that map on to the Class D multicast
addresses.
Perform the following configuration in System View.
Table 82 Configuring the Creation of ARP Entries for Multicast Packets
Operation
Configure the Switch NOT to create ARP entries
Configure the Switch to create ARP entries
Command
ip_address mac_address vlan_id
arp static
ip_address
undo arp
must be the ID of a VLAN that has been created by the
Command
arp timer aging
undo arp timer aging
ARP Configuration 89
aging_time
Command
arp check enable
undo arp check enable