Lantronix
SM24TBT2DPA and SM24TBT2DPB Web User Guide
Parameter descriptions:
System Configuration
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 related actions are disabled.
Aging Enabled:
If checked, secured MAC addresses are subject to aging; see
Aging Period
below.
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 10 - 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.
Port Configuration:
The table has one row for each port on the selected switch and a number of
columns, which are:
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. 'Limit' must be an
integer value between 1 and 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 are 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.