Planet GS-5220 Series User Manual page 425

• Aging Period
Port Configuration
The table has one row for each port and a number of columns, which are:
Object
• Port
If Aging Enabled is checked, then the aging period is controlled with
this input. If other modules are using the underlying port security for
securing MAC addresses, they may have other requirements to the
aging period. The underlying port security will use the shorter
requested aging period of all modules that use the functionality.
The Aging Period can be set to a number between 10 and 10,000,000
seconds.
To understand why aging may be desired, consider the following
scenario: Suppose an end-host is connected to a 3rd party switch or
hub, which in turn is connected to a port on this switch on which Limit
Control is enabled. The end-host will be allowed to forward if the limit
is not exceeded. Now suppose that the end-host logs off or powers
down. If it wasn't for aging, the end-host would still take up resources
on this switch and will be allowed to forward. To overcome this
situation, enable aging. With aging enabled, a timer is started once the
end-host gets secured. When the timer expires, the switch starts
looking for frames from the end-host, and if such frames are not seen
within the next Aging Period, the end-host is assumed to be
disconnected, and the corresponding resources are freed on the
switch.
Description
The port number for which the configuration below applies.
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User's Manual of GS-5220 LCD Series