KTI Networks KGS-1064-HP User Manual page 53

Configuration
System Configuration
Mode
Aging Enabled
Aging Period
Port Configuration
Port
Mode
Limit
Action
Description
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.
If checked, secured MAC addresses are subject to aging as discussed under 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.
The port number to which the configuration below applies.
Controls whether Limit Control is enabled on this port. Both this and the Global
Mode must be set to Enabled for Limit Control to be in effect. Notice that other
modules may still use the underlying port security features without enabling Limit
Control on a given port.
The maximum number of MAC addresses that can be secured on this port. This
number cannot exceed 1024. If the limit is exceeded, the corresponding action is
taken.
If Limit is reached, the switch can take one of the following actions:
None: Do not allow more than Limit MAC addresses on the port, but take no further
action.
Trap: If (Limit + 1) MAC addresses are seen on the port, send an SNMP trap. If
Aging is disabled, only one SNMP trap will be sent, but with Aging enabled, new
SNMP traps will be sent every time the limit gets exceeded.
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