Cisco Catalyst 3750-X Software Configuration Manual page 256

Controlling Switch Access with RADIUS
Session Identification
For disconnect and CoA requests targeted at a particular session, the switch locates the session based on
one or more of the following attributes:
•
•
•
Unless all session identification attributes included in the CoA message match the session, the switch
returns a Disconnect-NAK or CoA-NAK with the "Invalid Attribute Value" error-code attribute.
For disconnect and CoA requests targeted to a particular session, any one of the following session
identifiers can be used:
•
•
•
If more than one session identification attribute is included in the message, all the attributes must match
the session or the switch returns a Disconnect- negative acknowledgement (NAK) or CoA-NAK with the
error code "Invalid Attribute Value."
The packet format for a CoA Request code as defined in RFC 5176 consists of the fields: Code,
Identifier, Length, Authenticator, and Attributes in Type:Length:Value (TLV) format.
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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|
|
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-
The attributes field is used to carry Cisco VSAs.
CoA ACK Response Code
If the authorization state is changed successfully, a positive acknowledgement (ACK) is sent. The
attributes returned within CoA ACK will vary based on the CoA Request and are discussed in individual
CoA Commands.
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:
•
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
10-22
Calling-Station-Id (IETF attribute #31 which contains the host MAC address)
Audit-Session-Id (Cisco VSA)
Acct-Session-Id (IETF attribute #44)
Calling-Station-ID (IETF attribute #31, which should contain the MAC address)
Audit-Session-ID (Cisco vendor-specific attribute)
Accounting-Session-ID (IETF attribute #44).
0 1
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
Code | Identifier
Attributes ...
Session Reauthentication
Chapter 10
2
| Length
Authenticator
Configuring Switch-Based Authentication
3
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OL-21521-01