Chapter 2 Understanding Cisco Access Registrar

Program Flow

Action

Explanation

 

 

Determines whether to

The Service name defined in

perform authorization.

/Radius/DefaultAuthorizationService, if different than

 

the Authentication Service.

 

 

*Executes the

A script referred to in

Service’s incoming

/Radius/Services/<Name>/IncomingScript.

script.

 

 

 

Performs

Checks that the Service type is defined in

authorization.

/Radius/Services/<Name>/<Type>.

 

 

*Executes the

A script referred to in

Service’s outgoing

/Radius/Services/<Name>/OutgoingScript.

script.

 

 

 

Session Management

The Session Management feature requires the client (NAS or proxy) to send all RADIUS accounting requests to the Cisco Access Registrar server performing session management. (The only exception is if the clients are USR/3Com Network Access Servers configured to use the USR/3Com RADIUS resource management feature.) This information is used to keep track of user sessions, and the resources allocated to those sessions.

When another accounting RADIUS server needs this accounting information, the Cisco Access Registrar server performing session management may proxy it to this second server.

Table 2-5describes how Cisco Access Registrar handles session management.

 

Table 2-5 Session Management Processing

 

 

 

Action

 

Explanation

 

 

 

Determines whether

 

The session management defined in the Environment

to perform session

 

dictionary variable Session-Manager.

management.

 

 

 

The session management name referred to in

 

 

 

 

/Radius/DefaultSessionManager.

 

 

 

Performs session

 

Selects Session Manager as defined in

management.

 

/Radius/SessionManagers/<Name>.

 

 

 

Performs resource

 

Directs the request to the appropriate Resource manager

management.

 

listed in

 

 

/Radius/SessionManagers/<Name>/ResourceManagers/<

 

 

Name>, which then allocates or checks the resource

 

 

according to the type listed in

 

 

/Radius/ResourceManagers/<Name>/<Type>.

 

 

 

Sends an

 

Creates and formats the response, and sends it back to the

Access-Accept.

 

client (NAS).

 

 

 

Failover by the NAS and Session Management

When a Network Access Server’s primary RADIUS server is performing session management, and the NAS determines the server is not responding and begins sending requests to its secondary RADIUS server, the following occurs:

Cisco Access Registrar 3.5 Concepts and Reference Guide

 

OL-2683-02

2-7

 

 

 

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Cisco Systems 3.5 manual Failover by the NAS and Session Management

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