Lantronix
SM24TBT2DPA and SM24TBT2DPB Web User Guide
Reauthentication Enabled:
If checked, successfully authenticated supplicants/clients are reauthenticated
after the interval specified by the Reauthentication Period. Reauthentication for 802.1X-enabled ports can
be used to detect if a new device is plugged into a switch port or if a supplicant is no longer attached.
For MAC-based ports, reauthentication is only useful if the RADIUS server configuration has changed. It
does not involve communication between the switch and the client, and therefore doesn't imply that a
client is still present on a port (see Aging Period below).
Reauthentication Period:
Determines the period, in seconds, after which a connected client must be
reauthenticated. This is only active if the Reauthentication Enabled checkbox is checked. Valid values are
in the range 1 to 3600 seconds.
EAPOL Timeout:
Sets the time for retransmission of Request Identity EAPOL (Extensible Authentication
Protocol over LAN) frames. Valid values are in the range 1 to 255 seconds. This has no effect for MAC-
based ports.
Aging Period:
This setting applies to these modes (i.e., modes using the Port Security functionality to
secure MAC addresses):
Single 802.1X
Multi 802.1X
MAC-Based Auth.
When the NAS module uses the Port Security module to secure MAC addresses, the Port Security module
needs to check for activity on the MAC address in question at regular intervals and free resources if no
activity is seen within a given period of time. This parameter controls exactly this period and can be set to
a number between 10 and 1000000 seconds.
If reauthentication is enabled and the port is in an 802.1X-based mode, this is not so critical, since
supplicants that are no longer attached to the port will get removed upon the next re-authentication, which
will fail. But if re-authentication is not enabled, the only way to free resources is by aging the entries.
For ports in MAC-based Auth. mode, reauthentication doesn't cause direct communication between the
switch and the client, so this will not detect whether the client is still attached or not, and the only way to
free any resources is to age the entry.
Hold Time:
This setting applies to the following modes, i.e. modes using the Port Security functionality to
secure MAC addresses:
Single 802.1X
Multi 802.1X
MAC-Based Auth.
If a client is denied access - either because the RADIUS server denies the client access or because the
RADIUS server request times out (according to the timeout specified on the "Configuration > Security >
AAA" page) - the client is put on hold in the Un-authorized state. The hold timer does not count during an
on-going authentication. In MAC-based Auth. mode, the switch will ignore new frames coming from the
client during the hold time. The Hold Time can be set to a number between 10 and 1000000 seconds.