Authentication Initiation And Message Exchange - Cisco IE-3000-8TC Software Configuration Manual
Software configuration guide
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Also See for IE-3000-8TC:
- Command reference manual (802 pages) ,
- Administration manual (496 pages) ,
- Message manual (98 pages)
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Chapter 12
Configuring IEEE 802.1x Port-Based Authentication
•
If Multidomain authentication (MDA) is enabled on a port, this flow can be used with some exceptions
that are applicable to voice authorization. For more information on MDA, see
Authentication" section on page
Authentication Initiation and Message Exchange
During 802.1x authentication, the switch or the client can initiate authentication. If you enable
authentication on a port by using the authentication port-control auto or dot1x port-control auto
interface configuration command, the switch initiates authentication when the link state changes from
down to up or periodically as long as the port remains up and unauthenticated. The switch sends an
EAP-request/identity frame to the client to request its identity. Upon receipt of the frame, the client
responds with an EAP-response/identity frame.
However, if during boot up, the client does not receive an EAP-request/identity frame from the switch,
the client can initiate authentication by sending an EAPOL-start frame, which prompts the switch to
request the client's identity.
Note
If 802.1x authentication is not enabled or supported on the network access device, any EAPOL frames
from the client are dropped. If the client does not receive an EAP-request/identity frame after three
attempts to start authentication, the client sends frames as if the port is in the authorized state. A port in
the authorized state effectively means that the client has been successfully authenticated. For more
information, see the
When the client supplies its identity, the switch begins its role as the intermediary, passing EAP frames
between the client and the authentication server until authentication succeeds or fails. If the
authentication succeeds, the switch port becomes authorized. If the authentication fails, authentication
can be retried, the port might be assigned to a VLAN that provides limited services, or network access
is not granted. For more information, see the
page
The specific exchange of EAP frames depends on the authentication method being used.
shows a message exchange initiated by the client when the client uses the One-Time-Password (OTP)
authentication method with a RADIUS server.
OL-13018-03
The Termination-Action RADIUS attribute (Attribute [29]) specifies the action to take during
re-authentication. The actions are Initialize and ReAuthenticate. When the Initialize action is set (the
attribute value is DEFAULT), the 802.1x session ends, and connectivity is lost during
re-authentication. When the ReAuthenticate action is set (the attribute value is RADIUS-Request),
the session is not affected during re-authentication.
You manually re-authenticate the client by entering the dot1x re-authenticate interface
interface-id privileged EXEC command.
"Ports in Authorized and Unauthorized States" section on page
12-9.
Understanding IEEE 802.1x Port-Based Authentication
12-11.
"Ports in Authorized and Unauthorized States" section on
Cisco IE 3000 Switch Software Configuration Guide
"Multidomain
12-9.
Figure 12-3
12-5
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