87
which is interpreted as a decimal string representing the VLAN ID. Leading '0's are discarded.
The final value must be in the range 1-4095.
The VLAN list can contain multiple VLAN identifiers in the format “1u,2t,3u” where “u”
indicates an untagged VLAN and “t” a tagged VLAN.
◆ 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 port settings determine whether
the port can be moved into Guest VLAN. When unchecked, the ability to move to the
Guest VLAN is disabled for all ports.
When Guest VLAN is both globally enabled and enabled for a given port, the switch
considers moving the port into the Guest VLAN according to the rules outlined below. This
option is only available for EAPOL-based modes, i.e. Port-based 802.1X, Single 802.1X,
and Multi 802.1X
NOTE: For trouble-shooting VLAN assignments, use the Monitor > VLANs > VLAN
Membership and VLAN Port pages. These pages show which modules have (temporarily)
overridden the current Port VLAN configuration.
Guest VLAN Operation
When a Guest VLAN enabled port's link comes up, the switch starts transmitting EAPOL
Request Identity frames. If the number of transmissions of such frames exceeds Max. Reauth.
Count and no EAPOL frames have been received in the meanwhile, the switch considers
entering the Guest VLAN. The interval between transmission of EAPOL Request Identity
frames is configured with EAPOL Timeout. If Allow Guest VLAN if EAPOL Seen is enabled,
the port will now be placed in the Guest VLAN. If disabled, the switch will first check its
history to see if an EAPOL frame has previously been received on the port (this history is
cleared if the port link goes down or the port's Admin State is changed), and if not, the port
will be placed in the Guest VLAN. Otherwise it will not move to the Guest VLAN, but continue
transmitting EAPOL Request Identity frames at the rate given by EAPOL Timeout.
Once in the Guest VLAN, the port is considered authenticated, and all attached clients on the
port are allowed access on this VLAN. The switch will not transmit an EAPOL Success frame
after entering the Guest VLAN.
While in the Guest VLAN, the switch monitors the link for EAPOL frames, and if one such
frame is received, the switch immediately takes the port out of the Guest VLAN and starts
authenticating the supplicant according to the port mode. If an EAPOL frame is received, the
port will never be able to go back into the Guest VLAN if the “Allow Guest VLAN if EAPOL
Seen” is disabled.
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