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Lantronix
SM12XPA Web User Guide
33848 Rev. A
Page
213
of
473
Hold Time
: The hold time - measured in seconds - is used to determine how long a MAC address is held in the
MAC table if it has been found to violate the limit. The valid range is 10 - 10000000 seconds with a default of 300
seconds. The reason for holding a violating MAC address in the MAC table is primarily to ensure that the same
MAC address doesn't give rise to continuous notifications (if notifications on violation count is enabled).
Port Configuration
: The table has one row for each port on the selected switch and several columns:
Port
: The port number to which the configuration below applies.
Mode
: 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.
Violation Mode
: If Limit is reached, the switch can take one of the following actions:
Protect
: Do not allow more than Limit MAC addresses on the port, but take no further action.
Restrict
: If Limit is reached, subsequent MAC addresses on the port will be counted and marked as
violating. Such MAC addresses are removed from the MAC table when the hold time expires. At most
Violation Limit MAC addresses can be marked as violating at any given time.
Shutdown
: If Limit is reached, one additional MAC address will cause the port to be shut down. This
implies that all secured MAC addresses be removed from the port, and no new addresses be learned.
There are three ways to re-open the port: 1) In the "Configuration > Ports" page's "Configured" column,
first disable the port, then restore the original mode. 2) Make a Port Security configuration change on
the port. 3) Boot the switch.
Violation Limit
: The maximum number of MAC addresses that can be marked as violating on this port.
This number cannot exceed 1023. The default is 4. It is only used when Violation Mode is ‘Restrict’.
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 only displays 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
displayed if Action is set to Shutdown or Trap & Shutdown.
Buttons
Apply
: Click to save changes.
Reset
: Click to undo any changes made locally and revert to previously saved values.