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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 in
the stack 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
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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 middle man, 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. It allows
different authentication methods such as MD5
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 the 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 or block traffic on the switch port connected
to the supplicant.
