3Com Switch 4500 26-Port User Manual

ARP Configuration 85
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 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 must be the ID of a VLAN that has been created by the
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.
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.
Manually add a static ARP
mapping entry (Ethernet Port
View)
arp static ip_address mac_address vlan_id
Manually delete a static ARP
mapping entry (System View or
Ethernet Port View)
undo arp ip_address
Tab le 80 Configuring the Dynamic ARP Aging Timer
Operation Command
Configure the dynamic ARP aging timer arp timer aging aging_time
Restore the default dynamic ARP aging time undo arp timer aging
Tab le 81 Configuring the Creation of ARP Entries for Multicast Packets
Operation Command
Configure the Switch NOT to create ARP entries arp check enable
Configure the Switch to create ARP entries undo arp check enable
Table 79 Manually Adding/Deleting Static ARP Mapping Entries
Operation Command

3Com Switch 4500 26-Port Specifications

General

Brand	3Com
Model	Switch 4500 26-Port
Category	Switch
Language	English