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Chapter 12. Security
Guest VLAN Enabled:
When Guest VLAN is both globally enabled and enabled (checked) 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
• Multi 802.1X
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 when 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.
Port State:
The current state of the port. It can undertake one of the following values:
Globally Disabled: IEEE 802.1X is globally disabled.
Link Down: IEEE 802.1X is globally enabled, but there is no link on the port.
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