Limit: 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.
The switch is "born" with a total number of MAC addresses from which all ports draw whenever a new
MAC address is seen on a Port Security-enabled port. Since all ports draw from the same pool, it may
happen that a configured maximum cannot be granted, if the remaining ports have already used all
available MAC addresses.
Action: 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 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.
Shutdown: If Limit + 1 MAC addresses is seen on the port, shut down the port. This implies that
all secured MAC addresses will be removed from the port, and no new address will be learned.
Even if the link is physically disconnected and reconnected on the port (by disconnecting the
cable), the port will remain shut down. There are three ways to re-open the port:
1) Boot the switch,
2) Disable and re-enable Limit Control on the port or the switch,
3) Click the Reopen button.
Trap & Shutdown: If Limit + 1 MAC addresses is seen on the port, both the "Trap" and the
"Shutdown" actions described above will be taken.
State: This column shows the current state of the port as seen from the Limit Control's point of view.
The state takes one of four values:
Disabled: Limit Control is either globally disabled or disabled on the port.
Ready: The limit is not yet reached. This can be shown for all actions.
Limit Reached: Indicates that the limit is reached on this port. This state can only be shown if
Action is set to none or Trap.
Shutdown: Indicates that the port is shut down by the Limit Control module. This state can only
be shown if Action is set to Shut Down or Trap & Shutdown.
Re-open Button: If a port is shut down by this module, you may reopen it by clicking this button,
which will only be enabled if this is the case. For other methods, refer to shut down in the Action
section.
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