AS Series User Manual
86
Doc No.: AS5-0116-01
Fig: The Port Security Limit Control Configuration
System Configuration
Parameter
Description
Mode
Indicates if Limit Control is globally enabled or disabled on the switch. If
globally disabled, other modules may still use the underlying functionality, but
limit checks and corresponding actions are disabled.
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 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.
Содержание AS5010-P
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