308 CHAPTER 12: FILE SYSTEM MANAGEMENT
When deleting the dynamic address table entries, the learned entries will be
deleted simultaneously.
Setting MAC Address Aging Time
Setting an appropriate aging time implements MAC address aging. Too long or
too short an aging time set by subscribers will cause the Ethernet switch to flood a
large amount of data packets. This affects the switch operation performance.
If the aging time is set too long, the 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out-of-date MAC address tables.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 the MAC address table according to the
network change.
If the aging time is set too short, the Switch may delete valid MAC address table
entries.
You can use the following commands to set the MAC address aging time for the
system.
Perform the following configuration in System View.
Table 353 Set the MAC Address Aging Time for the System
In addition, this command takes effect on all the ports. However the address aging
only functions on the dynamic addresses (manual entries added to the Switch are
not aged).
By default, the
aging-time
is 300 seconds. With the no-aging parameter, the
command performs no aging on the MAC address entries.
Setting the Max Count of MAC Addresses Learned by a Port
With the address learning function, a Switch can learn new MAC addresses. After
its received a packet destined for an already learned MAC address, the Switch will
forward it directly with the hardware, instead of broadcasting it. However, too
many MAC address items learned by a port will affect the Switch operation
performance.
You can control the MAC address items learned by a port through setting the max
count of MAC addresses learned by a port. If a user sets the max count value of a
port as
count
, the port will not learn new MAC address items when the count of
MAC address items reaches the
count
value.
You can use the following commands to set the max count of MAC addresses
learned by a port.
Perform the following configuration in Ethernet Port View.
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
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