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Chapter 4: Security
Parameter Description
• 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 of 1 to 3600 seconds.
• EAPOL Timeout: Determines the time for retransmission of Request Identity EAPOL 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 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 1,000,000 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, and 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. 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 1,000,000 seconds.
• RADIUS-Assigned QoS Enabled: RADIUS-assigned QoS provides a means to centrally control the traffic class to which traffic
coming from a successfully authenticated supplicant is assigned on the switch. The RADIUS server must be configured to
transmit special RADIUS attributes to take advantage of this feature (see RADIUS-Assigned QoS Enabled below for a detailed
description).
The “RADIUS-Assigned QoS Enabled“ checkbox provides a quick way to globally enable/disable RADIUS-server assigned QoS
Class functionality. When checked, the individual ports’ ditto settings determine whether RADIUS-assigned QoS Class is enabled
on that port. When unchecked, RADIUS-server assigned QoS Class is disabled on all ports.
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