Mac Address Table Management - 3Com 4200G 12-Port Configuration Manual

MAC Address Table
Management
Configuring a MAC
Address Entry and the
Aging Time
Setting the Maximum
Number of MAC
Addresses a Port can
Learn
By setting the maximum numbers of MAC addresses that can be learnt from
individual ports, you can control the number of the MAC address entries the MAC
address table can dynamically maintains. When the number of the MAC address
entries learnt from a port reaches the set value, the port stops learning MAC
addresses.
The total number of static MAC addresses and blackhole MAC addresses that can
■
be configured for a switch is 1,024.
The number of static MAC addresses and blackhole MAC addresses depends on
■
the maximum number of MAC address entries configured for a switch. For
S4200G series switches, the maximum number of MAC addresses entries is 16K.
The configuration to manage a MAC address table includes:
Configuring a MAC Address Entry and the Aging Time
■
Setting the Maximum Number of MAC Addresses a Port can Learn
■
You can add, modify, or remove one MAC address entry, remove all MAC address
entries concerning a specific port (unicast MAC addresses only), or remove specific
type of MAC address entries (such as dynamic or static MAC address entries).
Table 70 Configure a MAC address entry
Operation Command
Enter system view system-view
Add/modify a MAC mac-address { static | dynamic |
address entry blackhole } mac-address
interface interface-type
interface-number vlan vlan-id
Set the aging time for mac-address timer { aging
dynamic MAC address seconds | no-aging }
entries
A MAC address table too big in size may decrease the forwarding performance of the
switch. By setting the maximum number of MAC addresses each port can learn, you
can limit the number of MAC address entries a switch maintains. A port stops
learning MAC addresses if the number of MAC addresses it has learnt reaches the set
value.
Table 71 Set the maximum number of MAC addresses a port can learn
Operation Command
Enter system view system-view
Enter port view interface interface-type
interface-number
Set the maximum mac-address max-mac-count
number of MAC count
addresses the port can
learn

MAC Address Table Management

Description
—
Required
Optional
The default aging time is 300
seconds.
The no-aging keyword specifies
that dynamic MAC address entries
do not age out.
Description
—
—
Required
By default, the number of the MAC
addresses a port can learn is not
limited.
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