User's Manual

Table Of Contents
Users Manual of GS-6320 and MGS-6320 Managed Switches
373
Figure 4-6-4-1: Port Limit Control Configuration Overview Page Screenshot
The page includes the following fields:
System Configuration
Object Description
Aging Enabled
If checked, secured MAC addresses are subject to aging as discussed under Aging
Period .
Aging Period
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