Cisco Catalyst 3750-X User Manual

10-22
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-21521-01
Chapter 10 Configuring Switch-Based Authentication
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:
• Calling-Station-Id (IETF attribute #31 which contains the host MAC address)
• Audit-Session-Id (Cisco VSA)
• Acct-Session-Id (IETF attribute #44)
Unless all session identification attributes included in t
he 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
identif
iers 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 s
ession 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

Cisco Catalyst 3750-X Specifications

General

Switching Capacity	160 Gbps
Stacking Bandwidth	64 Gbps
Max Stacking Units	9
Layer Support	Layer 2 and Layer 3
Form Factor	Rack-mountable
DRAM	256 MB
Flash Memory	64 MB
Model	Cisco Catalyst 3750-X Series
Ports	24 or 48 10/100/1000 Ethernet ports
Uplink Interfaces	4 SFP or 2 SFP+
Features	StackWise Plus, EnergyWise
Image	IP Base or IP Services
Operating Temperature	0 to 40°C
Operating Humidity	10 to 85% noncondensing