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Controlling Switch Access with RADIUS
RADIUS Change of Authorization
This section provides an overview of the RADIUS interface including available primitives and how they
are used during a Change of Authorization (CoA).
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Overview
A standard RADIUS interface is typically used in a pulled model where the request originates from a
network attached device and the response come from the queried servers. Catalyst switches support the
RADIUS Change of Authorization (CoA) extensions defined in RFC 5176 that are typically used in a
pushed model and allow for the dynamic reconfiguring of sessions from external authentication,
authorization, and accounting (AAA) or policy servers.
Beginning with Cisco IOS Release 12.2(52)SE, the switch supports these per-session CoA requests:
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The RADIUS interface is enabled by default on Catalyst switches. However, some basic configuration
is required for the following attributes:
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Change-of-Authorization Requests
Change of Authorization (CoA) requests, as described in RFC 5176, are used in a push model to allow
for session identification, host reauthentication, and session termination. The model is comprised of one
request (CoA-Request) and two possible response codes:
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The request is initiated from a CoA client (typically a RADIUS or policy server) and directed to the
switch that acts as a listener.
Cisco Catalyst Blade Switch 3130 and 3032 for Dell Software Configuration Guide
7-20
Overview, page 7-20
Change-of-Authorization Requests, page 7-20
CoA Request Response Code, page 7-22
CoA Request Commands, page 7-23
Session Reauthentication, page 7-23
Stacking Guidelines for Session Termination, page 7-25
Session reauthentication
Session termination
Session termination with port shutdown
Session termination with port bounce
Security and Password—refer to the
the Configuring Switch-Based Authentication chapter in the Catalyst 3750 Switch Software
Configuration Guide, 12.2(50)SE.
Accounting—refer to the
"Starting RADIUS Accounting"
Authentication chapter in the Catalyst 3750 Switch Software Configuration Guide, 12.2(50)SE.
CoA acknowledgement (ACK) [CoA-ACK]
CoA non-acknowledgement (NAK) [CoA-NAK]
Chapter 7
"Preventing Unauthorized Access to Your Switch"
section in the Configuring Switch-Based
Configuring Switch-Based Authentication
section in
OL-12247-04
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