INS_CNGE3FE8MS[POE][HO] Rev. 11.7.17 PAGE 56
INSTRUCTION MANUAL CNGE3FE8MS[POE][HO]
TECH SUPPORT: 1.888.678.9427
Object Description
System Configuration
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
Amodules 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.
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