The MAC table needs to be updated constantly because the
network topology always changes. The entries automatically generated
in a MAC table are not always valid. Each entry has a lifecycle. If
an entry is not updated within the lifecycle, it is deleted. This
lifecycle is called the aging time. If an entry is updated before
its lifecycle ends, the aging timer of the entry is reset.
Context
You need to set the aging time properly. If the aging
time is excessively short, the
switch may broadcast a large number of data frames because their
destination MAC addresses cannot be found in the MAC table. This degrades
the performance of the
switch.
- If the aging time is excessively long, the switch may save a large number
of useless MAC entries, and new MAC entries cannot be added because
the number of MAC entries is limited. As a result, the switch cannot update the MAC
table according to network changes.
- If the aging time is excessively short, the switch may delete valid MAC
entries, and therefore the forwarding performance is degraded.
Generally, the default aging time (300s) is recommended.
Procedure
- Choose in the navigation tree to open the MAC Aging
Time page.
Table 1 describes the parameters on the MAC Aging Time page.
Table 1 MAC Aging Time
Parameter
|
Description
|
Aging time
|
Indicates the aging time of MAC entries.
|
- Set the parameters.
- Click Apply to complete the configuration.
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