Cisco Catalyst 3130, Software Configuration Manual

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Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
OL-12247-04
Chapter 7 Configuring Switch-Based Authentication
Controlling Switch Access with RADIUS
CoA NAK Response Code
A negative acknowledgement (NAK) indicates a failure to change the authorization state and can include
attributes that indicate the reason for the failure. Use
show commands to verify a successful CoA.
CoA Request Commands
This section includes:
• Session Reauthentication
•
Session Reauthentication in a Switch Stack
• Session Termination
•
CoA Disconnect-Request
• CoA Request: Disable Host Port
•
CoA Request: Bounce-Port
Beginning with Cisco IOS Release 12.2(52)SE, the switch supports the commands shown in Table 7-4 .
Session Reauthentication
The AAA server typically generates a session reauthentication request when a host with an unknown
identity or posture joins the network and is associated with a restricted access authorization profile (such
as a guest VLAN). A reauthentication request allows the host to be placed in the appropriate
authorization group when its credentials are known.
To initiate session authentication, the AAA server sends a standard CoA-Request message which
contains a Cisco vendor-specific attribute (VSA) in this form:
Cisco:Avpair=“subscriber:command=reauthenticate” and one or more session identification attributes.
The current session state determines the switch response to the message. If the session is currently
authenticated by IEEE 802.1x, the switch responds by sending an EAPoL
1
-RequestId message
(see footnote 1 below) to the server.
If the session is currently authenticated by MAC authentication bypass (MAB), the switch sends an
access-request to the server, passing the same identity attributes used for the initial successful
authentication.
If session authentication is in progress when the switch receives the command, the switch terminates the
process, and restarts the authentication sequence, starting with the method configured to be attempted
first.
Table 7-4 CoA Commands Supported on the Switch
Command
1
1. All CoA commands must include the session identifier between the switch and the CoA client.
Cisco VSA
Reauthenticate host Cisco:Avpair=“subscriber:command=reauthenticate”
Terminate session This is a standard disconnect request that does not require a VSA.
Bounce host port Cisco:Avpair=“subscriber:command=bounce-host-port”
Disable host port Cisco:Avpair=“subscriber:command=disable-host-port”
1. Extensible Authentication Protocol over Lan