Configuring Mac Address Table Management - 3Com 4210 PWR Configuration Manual

134 C 13: MAC A
HAPTER
Configuring MAC
Address Table
Management
MAC Address Table
Management
Configuration Tasks
T M
DDRESS ABLE ANAGEMENT
n
Aging timer only takes effect on dynamic MAC address entries.
Entries in a MAC address table
Entries in a MAC address table fall into the following categories according to their
characteristics and configuration methods:
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.
Blackhole MAC address entry: This type of MAC address entries are configured
■
manually. A switch discards the packets destined for or originated from the
MAC addresses contained in blackhole MAC address entries.
Table 88 lists the different types of MAC address entries and their characteristics.
Table 88 Characteristics of different types of MAC address entries
MAC address
entry
Static MAC address
entry
Dynamic MAC
address entry
Blackhole MAC
address entry
Table 89 Configure MAC address table management
Operation
Configure a MAC address
entry
Set the aging time of MAC
address entries
Set the maximum number of
MAC addresses a port can
learn
Configuration Aging time
method
Manually Unavailable
configured
Manually Available
configured or
generated by MAC
address learning
mechanism
Manually Unavailable
configured
Description
Required
Optional
Optional
Reserved or not at reboot
(if the configuration is
saved)
Yes
No
Yes
Related section
"Configuring a MAC Address
Entry".
"Setting the Aging Time of
MAC Address Entries".
"Setting the Maximum
Number of MAC Addresses a
Port Can Learn".