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.
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 is 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:
Boot the switch,
Disable and re-enable Limit Control on the port or the switch,
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 Shutdown or Trap & Shutdown.
Re-open Button:
If a port is shutdown 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 Shutdown in the Action section.
5
Clicking the reopen button causes the page to be refreshed, so non-committed changes will be lost
Upper right icon (Refresh):
Refresh the Port Security information manually.
Buttons:
Save – Click to save changes.
Reset – Click to undo any changes made locally and revert to previously saved values.
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LANCOM GS-2310P/GS-2326(P) User Manual
5 Security