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CHAPTER 10: SECURITY
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 function 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 ongoing 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.
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 port’s ditto setting determines whether RADIUS-assigned QoS Class is enabled
on that port. When unchecked, RADIUS-server assigned QoS Class is disabled on all ports.
RADIUS-Assigned VLAN Enabled: RADIUS-assigned VLAN provides a means to centrally control the VLAN on which a successfully
authenticated supplicant is placed on the switch. Incoming traffic will be classified to and switched on the RADIUS-assigned VLAN.
The RADIUS server must be configured to transmit special RADIUS attributes to take advantage of this feature (see RADIUS-
Assigned VLAN Enabled below for a detailed description).
The “RADIUS-Assigned VLAN Enabled” checkbox provides a quick way to globally enable/disable RADIUS-server assigned VLAN
functionality. When checked, the individual port’s ditto setting determines whether RADIUS-assigned VLAN is enabled on that
port. When unchecked, RADIUS-server assigned VLAN is disabled on all ports.
Guest VLAN Enabled: A Guest VLAN is a special VLAN— typically with limited network access—on which 802.1X-unaware clients are
placed after a network administrator-defined timeout. The switch follows a set of rules for entering and leaving the Guest VLAN as
listed below.
The “Guest VLAN Enabled” checkbox provides a quick way to globally enable/disable Guest VLAN functionality. When checked,
the individual ports’ ditto setting determines whether the port can be moved into Guest VLAN. When unchecked, the ability to
move to the Guest VLAN is disabled on all ports.
Guest VLAN ID: This is the value that a port’s Port VLAN ID is set to if a port is moved into the Guest VLAN. It is only changeable if
the Guest VLAN option is globally enabled. Valid values are in the range [1; 4094].
Max. Reauth. Count: The number of times the switch transmits an EAPOL Request Identity frame without response before
considering entering the Guest VLAN is adjusted with this setting. The value can only be changed if the Guest VLAN option is
globally enabled. Valid values are in the range [1; 255].
