3Com Switch 7750 Configuration Guide

Configuring MAC Address Table Management 227
■ Static MAC address entry: Also known as permanent MAC address entry. This
type of MAC address entries are added/removed manually and can not age out
by themselves. Using static MAC address entries can reduce broadcast packets
remarkably and are suitable for networks where network devices seldom
change.
■ Dynamic MAC address entry: This type of MAC address entries age out after
the configured aging time. They are generated by the MAC address learning
mechanism or configured manually.
Table 152 lists the different types of MAC address entries and their characteristics.
Configuring MAC
Address Table
Management
MAC Address Entry
Configuration Tasks
Configuring a MAC
Address Entry
You can add, modify, or remove one MAC address entry, remove all the MAC
address entries (unicast MAC addresses only) concerning a specific port, or remove
a specific type of MAC address entries (dynamic or static).
Table 152 Characteristics of different types of MAC address entries
MAC address entry
Configuration
method Aging time
Reserved or not
at reboot (if the
configuration is
saved)
Static MAC address
entry
Manually configured Unavailable Yes
Dynamic MAC address
entry
Manually configured or
generated by MAC
address learning
mechanism
Available No
Table 153 MAC address entry configuration tasks
Configuration task Description Related section
Configure a MAC address entry Required “Configuring a MAC Address
Entry” on page 227
Set the aging time for MAC addresses Optional “Setting the Aging Time for
MAC Address Entries” on page
228
Configure the maximum number of
MAC addresses that a port can learn
Optional “Setting the Maximum Number
of MAC Addresses a Port Can
Learn” on page 228
Disable a port from learning MAC
addresses
Optional “Disabling MAC Address
Learning” on page 229
Configure MAC address
synchronization between module chips
Optional “Configuring MAC Address
Learning Synchronization
Between Module Chips” on
page 229
Disable HiGig ports from learning MAC
addresses
Optional “Disabling HiGig Ports from
Learning MAC Addresses” on
page 229.