Transition Networks
S4224 Web User Guide
33558 Rev. C
Page 95 of 669
NAS System Configuration
Mode
Indicates if NAS is globally enabled or disabled on the S4224. 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
Sets 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 on MAC-based ports.
Aging Period
This setting applies to the following modes (i.e., modes using the Port Security function) 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.
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 Unauthorized state. The hold timer does not
count during an on-going authentication.
