3com 8807 User Guide
Maximum MAC Address Number Learned by Ethernet Port and Forwarding Option Configuration
117
In addition, this command takes effect on all the ports. However the address aging
only functions on the dynamic addresses (the learned or configured as age entries
by the user).
only functions on the dynamic addresses (the learned or configured as age entries
by the user).
By default, the aging-time is 300 seconds. With the key word no-aging, the
command performs no aging on the MAC address entries.
command performs no aging on the MAC address entries.
c
CAUTION: The dynamic MAC address aging is completed during the second
aging cycle.
aging cycle.
Maximum MAC
Address Number
Learned by Ethernet
Port and Forwarding
Option Configuration
Address Number
Learned by Ethernet
Port and Forwarding
Option Configuration
With MAC address learning, Switch 8800 Family switches can obtain MAC
addresses of every network devices on network segments connecting to a port. As
for packets destined to those MAC addresses, the switch directly uses hardware to
forward them. An overlarge MAC address table may cause the low forwarding
performance of the switch.
addresses of every network devices on network segments connecting to a port. As
for packets destined to those MAC addresses, the switch directly uses hardware to
forward them. An overlarge MAC address table may cause the low forwarding
performance of the switch.
You can control the number of entries of the MAC address table by setting the
maximum number of MAC addresses learned by a port. if you set the value to
count, and when the number of MAC addresses learned by the port reaches this
value, this port will no longer learn any more MAC addresses.
maximum number of MAC addresses learned by a port. if you set the value to
count, and when the number of MAC addresses learned by the port reaches this
value, this port will no longer learn any more MAC addresses.
You can also set the switch to forward corresponding packets when the number
of MAC addresses learned by the port exceeds the configured threshold.
of MAC addresses learned by the port exceeds the configured threshold.
Maximum MAC Address
Number Learned by a
Port and Forwarding
Option Configuration
Tasks
Perform the following configuration to set the maximum number of MAC
addresses that can be learned by an Ethernet port and the processing policy to be
adopted by the switch when this number is reached.
addresses that can be learned by an Ethernet port and the processing policy to be
adopted by the switch when this number is reached.
Table 99 Set the MAC address aging time for the system
Operation
Command
Set the dynamic MAC address aging time
mac-address timer { aging age | no-aging }
Restore the default MAC address aging time
undo mac-address timer aging
Table 100 Configure the maximum number of MAC addresses learned by a port and
processing policy
processing policy
Configuration item
Command
Description
Enter system view
<SW8800> system-view
-
Enter Ethernet port view
Interface interface-type
interface-number
interface-number
-
Set the maximum number of
MAC addresses learned by an
Ethernet port
MAC addresses learned by an
Ethernet port
mac-address
max-mac-count count
max-mac-count count
By default, the switch has no
limit on the maximum number
of MAC addresses learned by
a port.
limit on the maximum number
of MAC addresses learned by
a port.
Set the processing policy
when the number of MAC
addresses learned by a port
reaches the threshold value
when the number of MAC
addresses learned by a port
reaches the threshold value
mac-address
max-mac-count enable {
alarm | forward }*
max-mac-count enable {
alarm | forward }*
By default, the switch
forwards packets whose
source MAC addresses are not
leaned by the port when the
number of MAC addresses
learned reaches the threshold
value.
forwards packets whose
source MAC addresses are not
leaned by the port when the
number of MAC addresses
learned reaches the threshold
value.