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Page 179
Chapter 4: Security
• 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 ports’ 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 802.1Xunaware
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; 4095].
• 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].
• Allow Guest VLAN if EAPOL Seen: The switch remembers if an EAPOL frame has been received on the port for the lifetime
of the port. Once the switch considers whether to enter the Guest VLAN, it will first check if this option is enabled or disabled.
If disabled (unchecked; default), the switch will only enter the Guest VLAN if an EAPOL frame has not been received on the
port for the lifetime of the port. If enabled (checked), the switch will consider entering the Guest VLAN even if an EAPOL frame
has been received on the port for the lifetime of the port.
The value can only be changed if the Guest VLAN option is globally enabled.
• Port Configuration: The table has one row for each port on the selected switch and a number of columns, which are:
- Port: The port number for which the configuration below applies.
- Admin State: If NAS is globally enabled, this selection controls the port's authentication mode. The following modes are
available:
- Force Authorized: In this mode, the switch will send one EAPOL Success frame when the port link comes up, and any client on
the port will be allowed network access without authentication.
- Force Unauthorized: In this mode, the switch will send one EAPOL Failure frame when the port link comes up, and any client
on the port will be disallowed network access.
• Port-based 802.1X: In the 802.1X-world, the user is called the supplicant, the switch is the authenticator, and the RADIUS
server is the authentication server. The authenticator acts as the man-in-the-middle, forwarding requests and responses
between the supplicant and the authentication server. Frames sent between the supplicant and the switch are special 802.1X
frames, known as EAPOL (EAP Over LANs) frames. EAPOL frames encapsulate EAP PDUs (RFC3748). Frames sent between the
switch and the RADIUS server are RADIUS packets. RADIUS packets also encapsulate EAP PDUs together with other attributes
like the switch’s IP address, name, and the supplicant's port number on the switch. EAP is very flexible, in that it allows for
different authentication methods, like MD5-Challenge, PEAP, and TLS. The important thing is that the authenticator (the switch)
doesn't need to know which authentication method the supplicant and the authentication server are using, or how many
information exchange frames are needed for a particular method. The switch simply encapsulates the EAP part of the frame
into the relevant type (EAPOL or RADIUS) and forwards it.
When authentication is complete, the RADIUS server sends a special packet containing a success or failure indication. Besides
forwarding this decision to the supplicant, the switch uses it to open up or block traffic on the switch port connected to the
supplicant.
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