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 255 seconds. This has no effect for MAC-based 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 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].
Allow Guest VLAN if EAPOL Seen: The switch remembers if an EAPOL frame has been received on the
port for the life-time 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 life-time 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 life-time of the port. The value can only be changed if the Guest
VLAN option is globally enabled.
Port Configuration
Port: The port number for which the configuration below applies.
Admin State: If 802.1X is globally enabled, this selection controls the port's authentication mode.
These 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.
To Next Page
Loading...