Switch 7700 Command reference Guide, v2.0

434 CHAPTER 11: USING SYSTEM MANAGEMENT COMMANDS
Use the undo mac-address-table max-mac-count command to cancel the
maximum limit on the number of MAC addresses learned by an Ethernet port. This
is the default. If you set no maximum limit, the MAC address table controls the
number of MAC addresses a port can learn.
Related commands: mac-address, mac-address timer, mac-address
mac-learning disable
Examples
To configure the port “Ethernet 1/0/3” to learn at most 600 MAC addresses, enter
the following:
[SW7700-Ethernet1/0/3]mac-address max-mac-count 600
To cancel the maximum limit on the number of MAC addresses learned by the port
“Ethernet1/0/3”, enter the following:
[SW7700-Ethernet1/0/3]undo mac-address max-mac-count
mac-address timer Syntax
mac-address timer { aging age | no-aging }
undo mac-address timer aging
View
System view
Parameter
aging age: Specifies the aging time (measured in seconds) of the Layer-2 dynamic
address table entry, ranging from 10 to 1000000; by default, the aging time is 300
seconds.
no-aging: No aging time.
Description
Using the mac-address timer command, you can configure the aging time of the
Layer-2 dynamic address table entry. Using the
undo mac-address timer
command, you can restore the default value.
Too long or too short aging time set by subscribers will cause the problem that the
Ethernet switch broadcasts a great mount of data packets without MAC
addresses, which will affect the switch operation performance.
If aging time is set too long, the Ethernet switch will store a great number of
out-of-date MAC address tables. This will consume MAC address table resources
and the switch will not be able to update MAC address table according to the
network change.
If aging time is set too short, the Ethernet switch may delete valid MAC address
table.