9-23
Catalyst 2975 Switch Software Configuration Guide
OL-19720-02
Chapter 9 Configuring Switch-Based Authentication
Controlling Switch Access with RADIUS
For disconnect and CoA requests targeted to a particular session, any one of these session identifiers can
be used:
•
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).
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.
0 1 2 3
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 | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| |
| Authenticator |
| |
| |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Attributes ...
+-+-+-+-+-+-+-+-+-+-+-+-+-
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:
•
•
Session Reauthentication in a Switch Stack
•
•
•
CoA Request: Disable Host Port
•
Beginning with Cisco IOS Release 12.2(52)SE, the switch supports the commands shown in
.
