HP FlexNetwork NJ5000, User Manual

Page: 265 / 475

253
Controlled/uncontrolled port and port authorization status
802.1X defines two logical ports for the network access port: controlled port and uncontrolled port.
Any packet arriving at the network access port is visible to both logical ports.
•
Controlled port
—Allows incoming and outgoing traffic to pass through when it is in the
authorized state, and denies incoming and outgoing traffic when it is in the unauthorized state,
as shown in
Figure 264 . The controlled port is set in authorized state if the client has passed
authentication, and in unauthorized state, if the client has failed authentication.
•
Uncontrolled port
—Is always open to receive and transmit EAPOL frames.
Figure 264 Authorization state of a controlled port
In the unauthorized state, a controlled port controls traffic in one of the following ways:
•
Performs bidirectional traffic control to deny traffic to and from the client.
•
Performs unidirectional traffic control to deny traffic from the client.
The device supports only unidirectional traffic control.
Packet formats
EAP packet format
Figure 265 shows the EAP packet format.
Figure 265 EAP packet format
•
Code
—Type of the EAP packet. Options include Request (1), Response (2), Success (3), or
Failure (4).
•
Identifier
—Used for matching Responses with Requests.
•
Length
—Length (in bytes) of the EAP packet. The length is the sum of the Code, Identifier,
Length, and Data fields.
Controlled port Uncontrolled port
Authenticator system 1
LAN
Controlled port Uncontrolled port
Authenticator system 2
LAN
Port unauthorized
Port authorized
0 15
Code
Data
Length
7
Identifier
2
4
N