Optical Systems Design OSD2524, User Manual

Page: 92 / 402

OPTICAL SYSTEMS DESIGN
DOC ID: 10120001
OSD2524 OPERATOR MANUAL
PAGE 92
The NAS configuration consists of two sections, a system- and a port-wide.
SYSTEM CONFIGURATION
Mode
Indicates if NAS is globally enabled or disabled on the switch. If globally disabled, all ports are allowed
forwarding of frames.
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
Determines the time for retransmission of Request Identity EAPOL frames.
Valid values are in the range 1 to 65535 seconds. This has no effect for MAC-based ports.
Aging Period
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.
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 reauthentication, which
will fail. But if reauthentication 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.