4.1.5.9 Security - Network - Limit Control
This page allows you to configure the Port Security Limit Control system and port settings.
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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 nu
of users on the port. If this number is exceeded, an action is taken. The action can be one of the fou
different actions as described below.
The Limit Control module utilizes a lower-layer module, Port Security module, which manages MAC
addresses learnt on the port.
The Limit Control configuration consists of two sections, a system- and a port-wide.
System Configuration
Mode
is globally enabled or disabled on the stack. If globally disabled, other
s may still use the underlying functionality, but limit checks and corresponding actions are
Indicates if Limit Control
module
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
lying port security for securing MAC addresses, they may have other requirements
an end-host is
using the under
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
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
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