Configuring Max Number Of Mac Addresses That Can Be Learned In A Vlan - 3Com 8807 Configuration Manual

118 C 16: MAC A
HAPTER
Configuring Maximum
MAC Address Number
Learned by Ethernet
Port and Forwarding
Option Example
Configuring Max
Number of MAC
Addresses that can be
Learned in a VLAN
T M
DDRESS ABLE ANAGEMENT
Network requirements
Set the maximum number of MAC addresses learned by Ethernet port
■
Ethernet3/1/3 to 600
Set the switch to drop the packets whose source MAC addresses are not
■
learned by the port when the number of MAC addresses learned exceeds 600
Configuration procedure
1 Enter system view.
<SW8800> system-view
[SW8800]
2 Enter Ethernet port view.
[SW8800] interface ethernet 3/1/3
3 Set the maximum number of MAC addresses learned by Ethernet port
Ethernet3/1/3 to 600.
[3Com-Ethernet3/1/3] mac-address max-mac-count 600
4 Set the switch to drop the packets whose source MAC addresses are not learned
by the port when the number of MAC addresses learned exceeds 600.
[3Com-Ethernet3/1/3] undo mac-address max-mac-count enable forward
The MAC address learning function enables Switch 8800 Family series switches to
obtain the MAC addresses of the network devices in network segments connected
to a VLAN. However, if the MAC address table in a VLAN is too big in size, the
forwarding performances of the switch will be decreased.
After setting the maximum number of MAC addresses that can be learned in a
VLAN, you can control the number of MAC address entries maintained by the
switch. With the maximum number of MAC addresses set, the switch stops
learning new MAC addresses when the set maximum number of MAC addresses
is reached.
Table 101 Configure the maximum number of MAC addresses that can be learned in a
VLAN
Operation
Enter system view
Enter VLAN view
Set the maximum number of
MAC addresses that can be
learned in a VLAN
n
If you execute the mac-address max-mac-count max-mac-num command with
the max-mac-num argument specifying a number smaller than the current
number of MAC addresses learned, the switch does remove the existing MAC
address entries, neither does it learn new MAC addresses. The switch resumes
MAC address learning when the number of MAC addresses learned is less than
the value of the max-mac-num argument.
Command
system-view
vlan vlan-id
mac-address
max-mac-count
max-mac-num
Description
-
-
By default, the number of
MAC addresses in a VLAN is
not limited.