3Com Switch 8800 Family Configuration Guide

116 CHAPTER 16: MAC ADDRESS TABLE MANAGEMENT
You can configure (add or modify) the MAC address entries manually according to
the actual networking environment. The entries can be static ones or dynamic
ones.
MAC Address Table
Management
Configuration
The following sections describe the MAC address table management
configuration tasks.
■ “Setting MAC Address Table Entries”
■ “Setting MAC Address Aging Time”
■ “Maximum MAC Address Number Learned by Ethernet Port and Forwarding
Option Configuration”
■ “Configuring Max Number of MAC Addresses that can be Learned in a VLAN”
Setting MAC Address
Table Entries
Administrators can manually add, modify, or delete the entries in MAC address
table according to the actual needs. They can also delete all the (unicast) MAC
address table entries related to a specified port or delete a specified type of
entries, such as dynamic entries or static entries.
You can use the following commands to add, modify, or delete the entries in MAC
address table.
Perform the following configuration in system view.
Setting MAC Address
Aging Time
The setting of an appropriate aging time can effectively implement the function of
MAC address aging. Too long or too short aging time set by subscribers will cause
the problem that the switch broadcasts a great amount of data packets without
MAC addresses, which will affect the switch operation performance.
If aging time is set too long, the switch will store a great number of out-of-date
MAC address tables. This will consume MAC address table resources and the
switch will not be able to update MAC address table according to the network
change.
If aging time is set too short, the switch may delete valid MAC address table.
You can use the following commands to set the MAC address aging time for the
system.
Perform the following configuration in system view.
Tabl e 98 Set MAC address table entries
Operation Command
Add/Modify an address entry
mac-address { static | dynamic } mac-addr interface
interface-type interface-number vlan vlan-id
Delete an address entry
undo mac-address [ static | dynamic ] [ mac-addr [
interface interface-type interface-number ] vlan vlan-id |
interface interface-type interface-number | vlan vlan-id ]