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Software User's
Manual
–
Version 3.0
Configuration > Security > Network > Limit Control
Port Security Limit Control Configuration
Limit Control allows for limiting the number of users on a given port. A user is identified by a MAC
address and VLAN ID. If Limit Control is enabled on a port, the limit specifies the maximum number of
users on the port. If this number is exceeded, an action is taken. The action can be one of the four
different actions as described below.
The Limit Control module utilizes a lower-layer module, Port Security module, which manages MAC
addresses learned on the port. The Limit Control configuration consists of two sections, a system- and
a port-wide.
System Configuration
Setting 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
.
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.