Cisco Access Registrar 3.5 Concepts and Reference Guide
July 2004
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Cisco Access Registrar 3.5 Concepts and Reference Guide
Copyright © 2002, 2003, 2004 Cisco Systems, Inc.
All rights reserved.
About This Guide ix
Obtaining Documentation ix
World Wide Web ix
Ordering Documentation x
Documentation Feedback x
Obtaining Technical Assistance x
Cisco.com x
Technical Assistance Center xi
Contacting TAC by Using the Cisco TAC Website xi
Contacting TAC by Telephone xi
CONTENTS
CHAPTER
CHAPTER
1 Overview 1-1
RADIUS Protocol 1-1
Steps to Connection 1-2
Types of RADIUS Messages 1-3
Packet Contents 1-3
The Attribute Dictionary 1-4
Proxy Servers 1-4
Basic Authentication and Authorization 1-5
2 Understanding Cisco Access Registrar 2-1
Cisco Access Registrar Hierarchy 2-1
UserLists and Groups 2-2
Profiles 2-2
Scripts 2-2
Services 2-2
Session Management Using Resource Managers 2-3
Cisco AR Directory Structure 2-4
Program Flow 2-4
Scripting Points 2-5
Client or NAS Scripting Points 2-5
Authentication and/or Authorization Scripting Points 2-6
Session Management 2-7
Failover by the NAS and Session Management 2-7
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Contents
Script Processing Hierarchy 2-8
Cross Server Session and Resource Management 2-9
Overview 2-9
Session-Service Service Step and Radius-Session Service 2-10
Configuring a Front Line Cisco Access Registrar 2-10
Configure Central AR 2-11
CHAPTER
3 Cisco Access Registrar Scripts 3-1
Using Cisco AR Scripts 3-1
ACMEOutgoingScript 3-1
AltigaIncomingScript 3-1
AltigaOutgoingScript 3-2
ANAAAOutgoing 3-2
AscendIncomingScript 3-2
AscendOutgoingScript 3-2
AuthorizePPP 3-2
AuthorizeService 3-2
AuthorizeSLIP 3-2
AuthorizeTelnet 3-3
CabletronIncoming 3-3
CabletronOutgoing 3-3
CiscoIncoming 3-3
CiscoOutgoing 3-3
CiscoWithODAPIncomingScript 3-3
ExecCLIDRule 3-3
ExecDNISRule 3-4
ExecFilterRule 3-4
ExecNASIPRule 3-4
ExecRealmRule 3-4
ExecTimeRule 3-4
LDAPOutage 3-5
MapSourceIPAddress 3-5
ParseAAARealm 3-5
ParseAAASRealm 3-5
ParseAARealm 3-5
ParseAASRealm 3-5
ParseProxyHints 3-6
ParseServiceAndAAARealmHints 3-6
ParseServiceAndAAASRealmHints 3-6
iv
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ParseServiceAndAARealmHints 3-6
ParseServiceAndAASRealmHints 3-6
ParseServiceAndProxyHints 3-6
ParseServiceHints 3-7
ParseTranslationGroupsByCLID 3-7
ParseTranslationGroupsByDNIS 3-7
ParseTranslationGroupsByRealm 3-7
UseCLIDAsSessionKey 3-7
USRIncomingScript 3-7
USRIncomingScript-IgnoreAccountingSignature 3-7
USROutgoingScript 3-8
Contents
CHAPTER
4 Understanding Replication 4-1
Replication Overview 4-1
How Replication Works 4-2
Replication Data Flow 4-2
Master Server 4-2
Slave Server 4-3
Security 4-3
Replication Archive 4-3
Ensuring Data Integrity 4-3
Transaction Data Verification 4-4
Transaction Order 4-4
Automatic Resynchronization 4-4
Full Resynchronization 4-5
Understanding Hot-Configuration 4-5
Replication’s Impact on Request Processing 4-5
Replication Configuration Settings 4-5
RepType 4-6
RepTransactionSyncInterval 4-6
Master 4-6
Slave 4-6
RepTransactionArchiveLimit 4-6
RepIPAddress 4-7
RepPort 4-7
RepSecret 4-7
RepIPMaster 4-7
RepMasterIPAddress 4-7
RepMasterPort 4-7
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Contents
Rep Members Subdirectory 4-8
Rep Members/Slave1 4-8
Name 4-8
IPAddress 4-8
Port 4-8
CHAPTER
5 Understanding SNMP 5-1
Overview 5-1
Supported MIBs 5-1
RADIUS-AUTH-CLIENT-MIB 5-1
RADIUS-AUTH-SERVER-MIB 5-2
RADIUS-ACC-CLIENT-MIB 5-2
RADIUS-ACC-SERVER-MIB 5-2
SNMP Traps 5-2
Supported Traps 5-3
carServerStart 5-3
carServerStop 5-3
carInputQueueFull 5-3
carInputQueueNotVeryFull 5-3
carOtherAuthServerNotResponding 5-4
carOtherAuthServerResponding 5-4
carOtherAccServerNotResponding 5-4
carOtherAccServerResponding 5-5
carAccountingLoggingFailure 5-5
Configuring Traps 5-5
Directories Searched 5-5
Configuration File Types 5-6
Switching Configuration Files in Mid-File 5-6
Community String 5-7
CHAPTER
vi
6 Prepaid Billing Solution 6-1
Overview 6-1
Configuring Prepaid Billing 6-3
Generic Call Flow 6-4
Call Flow Details 6-4
Access-Request (Authentication) 6-5
Access-Accept (Authentication) 6-6
Access-Request (Authorization) 6-6
Access-Accept (Authorization) 6-6
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G
LOSSARY
Contents
Accounting Start 6-7
Data Flow 6-7
Access-Request (Quota Depleted) 6-8
Accept-Accept (Quota Depleted) 6-8
Accounting Stop (Session End) 6-9
Accounting Response (Final Status) 6-9
Vendor-Specific Attributes 6-10
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Contents
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About This Guide
This document provides information to help you understand RADIUS concepts and to help you develop
a better understanding of the Cisco Access Registrar 3.0 server. This document contains the following
chapters:
• Chapter 1, “Overview,” overview of the RADIUS server, including connection steps, RADIUS
message types, and using Cisco Access Registrar as a proxy server.
• Chapter 2, “Understanding Cisco Access Registrar,” describes the Cisco Access Registrar object
structure, and explains when Cisco Access Registrar references each of these objects during the
processing of client requests.
• Chapter 3, “Cisco Access Registrar Scripts,” describes the scripts provided with Cisco Access
Registrar.
• Chapter 4, “Understanding Replication,” describes Cisco Access Registrar's configuration
replication features, functions, limitations and operation.
• Chapter 5, “Understanding SNMP,” provides information about Cisco Access Registrar support for
SNMP.
• Chapter 6, “Prepaid Billing Solution,” describes the generic call flow between the three components
required to support a prepaid billing solution using the RADIUS protocol: the AAA client, the Cisco
Access Registrar 3.0 server, and a prepaid billing server.
This guide also contains a Glossary and an Index.
Obtaining Documentation
The following sections provide sources for obtaining documentation from Cisco Systems.
World Wide Web
You can access the most current Cisco documentation on the World Wide Web at the following sites:
• http://www.cisco.com
• http://www-china.cisco.com
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• http://www-europe.cisco.com
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Obtaining Technical Assistance
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Obtaining Technical Assistance
About This Guide
xii
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CHA P TER
1
Overview
The chapter provides an overview of the RADIUS server, including connection steps, RADIUS message
types, and using Cisco Access Registrar as a proxy server.
Cisco Access Registrar is a RADIUS (Remote Authentication Dial-In User Service) server that allows
multiple dial-in Network Access Server (NAS) devices to share a common authentication, authorization,
and accounting database.
Cisco Access Registrar handles the following tasks:
• Authentication—determines the identity of users and whether they may be allowed to access the
network
• Authorization—determines the level of network services available to authenticated users after they
are connected
• Accounting—keeps track of each user’s network activity
• Session and resource management—tracks user sessions and allocates dynamic resources
Using a RADIUS server allows you to better manage the access to your network, as it allows you to store
all security information in a single, centralized database instead of distributing the information around
the network in many different devices. You can make changes to that single database instead of making
changes to every network access server in your network.
RADIUS Protocol
Cisco Access Registrar is based on a client/server model, which supports AAA (authentication,
authorization, and accounting). The client is the Network Access Server (NAS) and the server is Cisco
Access Registrar. The client passes user information on to the RADIUS server and acts on the response
it receives. The server, on the other hand, is responsible for receiving user access requests, authenticating
and authorizing users, and returning all of the necessary configuration information the client can then
pass on to the user.
The protocol is a simple packet exchange in which the NAS sends a request packet to the Cisco Access
Registrar with a name and a password. Cisco Access Registrar looks up the name and password to verify
it is correct, determines for which dynamic resources the user is authorized, then returns an accept packet
that contains configuration information for the user session (Figure 1-1).
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Cisco Access Registrar 3.5 Concepts and Reference Guide
1-1
RADIUS Protocol
Chapter 1 Overview
Figure 1-1 Packet Exchange Between User, NAS, and RADIUS
Cisco Access Registrar can also reject the packet if it needs to deny network access to the user. Or, Cisco
Access Registrar may issue a challenge that the NAS sends to the user, who then creates the proper
response and returns it to the NAS, which forwards the challenge response to Cisco Access Registrar in
a second request packet.
In order to ensure network security, the client and server use a shared secret, which is a string they both
know, but which is never sent over the network. User passwords are also encrypted between the client
and the server to protect the network from unauthorized access.
Steps to Connection
Three participants exist in this interaction: the user, the NAS, and the RADIUS server. The following
steps describe the receipt of an access request through the sending of an access response.
Step 1 The user, at a remote location such as a branch office or at home, dials into the NAS, and supplies a name
and password.
Step 2 The NAS picks up the call and begins negotiating the session.
a. The NAS receives the name and password.
Jane
xyz
Name=Jane
Password=xyz
request
N
A
S
response
Radius
22036
1-2
b. The NAS formats this information into an Access-Request packet.
c. The NAS sends the packet on to the Cisco Access Registrar server.
Step 3 The Cisco Access Registrar server determines what hardware sent the request (NAS) and parses the
packet.
d. It sets up the Request dictionary based on the packet information.
e. It runs any incoming scripts, which are user-written extensions to Cisco Access Registrar. An
incoming script can examine and change the attributes of the request packet or the environment
variables, which can affect subsequent processing.
f. Based on the scripts or the defaults, it chooses a service to authenticate and/or authorize the user.
Step 4 Cisco Access Registrar’s authentication service verifies the username and password is in its database.
Or, Cisco Access Registrar delegates the authentication (as a proxy) to another RADIUS server, an
LDAP, or TACACS server.
Step 5 Cisco Access Registrar’s authorization service creates the response with the appropriate attributes for
the user’s session and puts it in the Response dictionary.
Step 6 If you are using Cisco Access Registrar session management at your site, the Session Manager calls the
appropriate Resource Managers that allocate dynamic resources for this session.
Step 7 Cisco Access Registrar runs any outgoing scripts to change the attributes of the response packet.
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Chapter 1 Overview
Step 8 Cisco Access Registrar formats the response based on the Response dictionary and sends it back to the
client (NAS).
Step 9 The NAS receives the response and communicates with the user, which may include sending the user an
IP address to indicate the connection has been successfully established.
Types of RADIUS Messages
The client/server packet exchange consists primarily of the following types of RADIUS messages:
• Access-Request—sent by the client (NAS) requesting access
• Access-Reject—sent by the RADIUS server rejecting access
• Access-Accept—sent by the RADIUS server allowing access
• Access-Challenge—sent by the RADIUS server requesting more information in order to allow
access. The NAS, after communicating with the user, responds with another Access-Request.
When you use RADIUS accounting, the client and server can also exchange the following two types of
messages:
• Accounting-Request—sent by the client (NAS) requesting accounting
RADIUS Protocol
Packet Contents
Table 1-1 RADIUS Packet Fields
• Accounting-Response—sent by the RADIUS server acknowledging accounting
The information in each RADIUS message is encapsulated in a UDP (User Datagram Protocol) data
packet. A packet is a block of data in a standard format for transmission. It is accompanied by other
information, such as the origin and destination of the data.
lists each message packet which contains the following five fields:
Fields Description
Code Indicates what type of message it is: Access-Request,
Access-Accept, Access-Reject, Access-Challenge,
Accounting-Request, or Accounting-Response.
Identifier Contains a value that is copied into the server’s response so the
client can correctly associate its requests and the server’s responses
when multiple users are being authenticated simultaneously.
Length Provides a simple error-checking device. The server silently drops
a packet if it is shorter than the value specified in the length field,
and ignores the octets beyond the value of the length field.
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1-3
RADIUS Protocol
Table 1-1 RADIUS Packet Fields (continued)
Fields Description
Authenticator Contains a value for a Request Authenticator or a Response
Attribute(s) Depends on the type of message being sent. The number of
The Attribute Dictionary
The Attribute dictionary contains a list of preconfigured authentication, authorization, and accounting
attributes that can be part of a client’s or user’s configuration. The dictionary entries translate an attribute
into a value Cisco Access Registrar uses to parse incoming requests and generate responses. Attributes
have a human-readable name and an enumerated equivalent from 1-255.
Sixty three standard attributes exist, which are defined in RFCs 2865, 2866, 2867, 2868, and 2869. There
also are additional vendor-specific attributes that depend on the particular NAS you are using.
Chapter 1 Overview
Authenticator. The Request Authenticator is included in a client’s
Access-Request. The value is unpredictable and unique, and is
added to the client/server shared secret so the combination can be
run through a one-way algorithm. The NAS then uses the result in
conjunction with the shared secret to encrypt the user’s password.
attribute/value pairs included in the packet’s attribute field is
variable, including those required or optional for the type of service
requested.
Proxy Servers
Some sample attributes include:
• User-Name—the name of the user
• User-Password—the user’s password
• NAS-IP-Address—the IP address of the NAS
• NAS-Port—the NAS port the user is dialed in to
• Framed Protocol—such as SLIP or PPP
• Framed-IP-Address—the IP address the client uses for the session
• Filter-ID—vendor-specific; identifies a set of filters configured in the NAS
• Callback-Number—the actual callback number.
Any one or all of the RADIUS server’s three functions: authentication, authorization, or accounting can
be subcontracted to another RADIUS server. Cisco Access Registrar then becomes a proxy server.
Proxying to other servers enables you to delegate some of the RADIUS server’s functions to other
servers.
You can use Cisco Access Registrar to “proxy” to an LDAP server for access to directory information
about users in order to authenticate them. Figure 1-2 shows user
joe initiating a request, the Cisco
Access Registrar server proxying the authentication to the LDAP server, and then performing the
authorization and accounting processing in order to enable
joe to log in.
1-4
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Chapter 1 Overview
Basic Authentication and Authorization
Figure 1-2 Proxying to an LDAP Server for Authentication
user=joe
password=xyz
1
6
NAS
request
2
5
response
Basic Authentication and Authorization
This section provides basic information about how Cisco Access Registrar performs the basic RADIUS
functions of authentication and authorization as defined in Internet RFC 2865.
• Authentication—determining the identity of a user of a client NAS through user identification and
password validation and deciding whether to grant access
• Authorization—determining the level of network services available to authenticated users after a
connection has been established
The Cisco Access Registrar (AR) server provides authentication and authorization service to clients
which are network access servers (NAS). The following paragraphs describe the steps to a connection.
1. The process begins when user dials into the NAS and enters a user name and a password. The NAS
creates an Access-Request containing attributes such as the user's name, the user's password, the ID
of the client, and the Port ID the user is accessing.
2. The Cisco AR server determines which hardware (client NAS) sent the request, parses the packet,
and determines whether to accept the request.
Access
registrar
3
LDAP
Authorization
accounting
Authentication
4
22035
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The Cisco AR server checks to see if the client's IP address is listed in
/Radius/Clients/<Name>/<IPAddress>.
3. After accepting the request, the Cisco AR server does the following:
–
Sets up the Request Dictionary based on the packet information
–
Runs any incoming scripts (user-written extensions to Cisco Access Registrar)
An incoming script can examine and change the attributes of the request packet or the
environmental variables which can affect subsequent processing.
–
Based on default values or scripts, it chooses a service to authenticate and authorize the user.
The Cisco AR server directs the request to the appropriate service, which then performs
authentication and/or authorization according to the type specified in
/Radius/Services/<Name>/<Type>.
–
Performs session management, directing the request to the appropriate Session Manager.
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Basic Authentication and Authorization
–
Performs resource management for each Resource Manager in the Session Manager. The Cisco
AR server directs the request to the appropriate resource manager listed in
/Radius/SessionManagers/<Name>/<ResourceManagers>/<Name>. The resource manager
then allocates or checks the resource according to the type listed in
/Radius/<ResourceManagers>/<Name>/<Type>.
4. The Cisco AR server finally creates and formats an Access-Accept, Access Reject, or Access
Challenge response, then sends it to the client (NAS).
Chapter 1 Overview
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Understanding Cisco Access Registrar
This chapter describes the Cisco Access Registrar object structure, and explains when Cisco Access
Registrar references each of these objects during the processing of client requests.
Cisco Access Registrar lets you manipulate configuration objects, which define the properties or
behavior of the RADIUS server. Cisco Access Registrar also lets you invoke custom scripts to affect the
behavior of the RADIUS server.
To better understand the role each of these objects plays in the program, it is helpful to look at the steps
Cisco Access Registrar performs from receipt of an Access-Request packet to the sending of an
Access-Response packet.
Cisco Access Registrar Hierarchy
Cisco Access Registrar’s operation and configuration is based on a set of objects. These objects are
arranged in a hierarchical structure much like the Windows 95 Registry or the UNIX directory structure.
Cisco Access Registrar’s objects can themselves contain subobjects, just as directories can contain
subdirectories.
These objects include the following:
• Radius— the root of the configuration hierarchy
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2
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• UserLists—contains individual UserLists which in turn contain users
• UserGroups—contains individual UserGroups
• Clients—contains individual Clients
• Vendors—contains individual Vendors
• Scripts—contains individual Scripts
• Services—contains individual Services
• SessionManagers—contains individual Session Managers
• ResourceManagers—contains individual Resource Managers
• Profiles—contains individual Profiles
• RemoteServers—contains individual RemoteServers
• Advanced—contains Ports, Interfaces, Reply Messages, and the Attribute dictionary.
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Cisco Access Registrar Hierarchy
UserLists and Groups
Cisco Access Registrar lets you organize your user community through the configuration objects
UserLists, users, and UserGroups.
• Use UserLists to group users by organization, such as Company A and Company B. Each list
contains the actual names of the users.
• Use users to store information about particular users, such as name, password, group membership,
base profile, and so on.
• Use UserGroups to group users by function, such as PPP, Telnet, or multiprotocol users. Groups
allow you to maintain common authentication and authorization requirements in one place, and have
them referenced by many users.
For more information about UserLists and UserGroups, refer to Access Registrar Server Objects in the
Cisco Access Registrar User’s Guide.
Profiles
Chapter 2 Understanding Cisco Access Registrar
Scripts
Cisco Access Registrar uses Profiles that allow you to group RADIUS attributes to be included in an
Access-Accept packet. These attributes include values that are appropriate for a particular user class,
such as PPP or Telnet user. The user’s base profile defines the user’s attributes, which are then added to
the response as part of the authorization process.
Although you can use Group or Profile objects in a similar manner, choosing whether to use one rather
than the other depends on your site. If you require some choice in determining how to authorize or
authenticate a user session, then creating specific profiles, and specifying a group that uses a script to
choose among the profiles is more flexible. In such a situation, you might create a default group and then
write a script that selects the appropriate profile based on the specific request. The benefit to this
technique is each user can have a single entry, and use the appropriate profile depending on the way they
log in.
For more information about Profiles, refer to Access Registrar Server Objects in the Cisco Access
Registrar User’s Guide.
Cisco Access Registrar allows you to create scripts you can execute at various points within the
processing hierarchy.
• Incoming scripts—enable you to read and set the attributes of the request packet, and set or change
the Environment dictionary variables. You can use the environment variables to control subsequent
processing, such as specifying the use of a particular authentication service.
• Outgoing scripts—enable you to modify attributes returned in the response packet.
Services
2-2
For more information about Scripts, refer to Access Registrar Server Objects in the Cisco Access
Registrar User’s Guide.
Cisco Access Registrar uses Services to let you determine how authentication, authorization, and/or
accounting are performed.
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Chapter 2 Understanding Cisco Access Registrar
For example, to use Services for authentication:
• When you want the authentication to be performed by the Cisco Access Registrar RADIUS server,
you can specify the local service. In this, case you must specify a specific UserList.
• When you want the authentication performed by another server, which may run an independent
application on the same or different host than your RADIUS server, you can specify either a radius,
ldap, or tacacs-udp service. In this case, you must list these servers by name.
When you have specified more than one authentication service, Cisco Access Registrar determines
which one to use for a particular Access-Request by checking the following:
• When an incoming script has set the Environment dictionary variable Authentication-Service with
the name of a Service, Cisco Access Registrar uses that service.
• Otherwise, Cisco Access Registrar uses the default authentication service. The default
authentication service is a property of the Radius object.
Cisco Access Registrar chooses the authentication service based on the variable
Authentication-Service, or the default. The properties of that Service, specify many of the details of
that authentication service, such as, the specific user list to use or the specific application (possibly
remote) to use in the authentication process.
For more information about Services, refer to Access Registrar Server Objects in the Cisco Access
Registrar User’s Guide.
Cisco Access Registrar Hierarchy
Session Management Using Resource Managers
Cisco Access Registrar lets you track user sessions, and/or allocate dynamic resources to users for the
lifetime of their session. You can define one or more Session Managers, and have each one manage the
sessions for a particular group or company.
Session Managers use Resource Managers, which in turn manage resources of a particular type as
described below.
• IP-Dynamic—manages a pool of IP addresses and allows you to dynamically allocate IP addresses
from that pool
• IP-Per-NAS-Port—allows you to associate ports to specific IP addresses, and thus ensure each NAS
port always gets the same IP address
• IPX-Dynamic—manages a pool of IPX network addresses
• Group-Session-Limit—manages concurrent sessions for a group of users; that is, it keeps track of
how many sessions are active and denies new sessions once the configured limit has been reached
• User-Session-Limit—manages per-user concurrent sessions; that is, it keeps track of how many
sessions each user has and denies the user a new session once the configured limit has been reached
• USR-VPN—manages Virtual Private Networks (VPNs) that use USR NAS Clients.
For more information about Session Managers, refer to Access Registrar Server Objects in the Cisco
Access Registrar User’s Guide.
If necessary, you can create a complex relationship between the Session Managers and the Resource
Managers.
When you need to share a resource among Session Managers, you can create multiple Session Managers
that refer to the same Resource Manager. For example, if one pool of IP addresses is shared by two
departments, but each department has a separate policy about how many users can be logged in
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Cisco AR Directory Structure
concurrently, you might create two Session Managers and three Resource Managers. One dynamic IP
Resource Manager that is referenced by both Session Managers, and two concurrent session Resource
Managers, one for each Session Manager.
In addition, Cisco Access Registrar lets you pose queries about sessions. For example, you can query
Cisco Access Registrar about which session (and thus which NAS-Identifier, NAS-Port and/or
User-Name) owns a particular resource, as well as query Cisco Access Registrar about how many
resources are allocated or how many sessions are active.
Cisco AR Directory Structure
The installation process populates the /opt/CSCOar directory with the subdirectories listed in Tab le 2 - 1.
Note This directory structure is different from that of previous version of Cisco AR.
Table 2-1 /opt/CSCOar Subdirectories
Chapter 2 Understanding Cisco Access Registrar
Subdirectory Description
.system Contains ELFs, or binary SPARC executables that should not be run directly
bin Contains shell scripts and programs frequently used by a network
administrator; programs that can be run directly
conf Contains configuration files
data Contains the radius directory, which contains session backing files; and the
db directory, which contains configuration database files
examples Contains documentation, sample configuration scripts, and shared library
scripts
lib Contains Cisco Access Registrar software library files
logs Contains system logs and is the default directory for RADIUS accounting
odbc Contains Cisco Access Registrar ODBC files
scripts Contains sample scripts that you can modify to automate configuration, and
to customize your RADIUS server
temp Used for temporary storage
ucd-snmp Contains the UCD-SNMP software Cisco Access Registrar uses
usrbin Contains a symbolic link that points to bin.
Program Flow
When a NAS sends a request packet to Cisco Access Registrar with a name and password, Cisco Access
Registrar performs the following actions. Note, Tab l e 2-2 describes the flow without regard to scripting
points.
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Program Flow
Table 2-2 From Access-Request to Access-Accept
Cisco AR Server Action Explanation
Receives an Access-Request The Cisco Access Registrar server receives an Access-Request packet from a NAS
Determines whether to accept
the request
Invokes the policy SelectPolicy
if it exists
Performs authentication and/or
authorization
Performs session management Directs the request to the appropriate Session Manager
Performs resource management
for each Resource Manager in
the SessionManager
Sends an Access-Accept Creates and formats the response, and sends it back to the client (NAS)
The Cisco Access Registrar server checks to see if the client’s IP address is listed in
/Radius/Clients/<Name>/<IPAddress>
The Cisco ARPolicy Engine provides an interface to define and configure a policy and
to apply the policy to the corresponding access-request packets
Directs the request to the appropriate service, which then performs authentication and/or
authorization according to the type specified in /Radius/Services/<Name>/<Type>
Directs the request to the appropriate resource manager listed in
/Radius/SessionManagers/<Name>/<ResourceManagers>/<Name>, which then
allocates or checks the resource according to the type listed in
/Radius/<ResourceManagers>/<Name>/<Type>
Scripting Points
Cisco Access Registrar lets you invoke scripts you can use to affect the Request, Response, or
Environment dictionaries.
Client or NAS Scripting Points
Table 2 - 3 shows the location of the scripting points within the section that determines whether to accept
the request from the client or NAS. Note, the scripting points are indicated with the asterisk (*) symbol.
Table 2-3 Client or NAS Scripting Points
Action Explanation
Receives an
Access-Request.
Determines whether to
accept the request.
*Executes the server’s
incoming script.
*Executes the vendor’s
incoming script.
*Executes the client’s
incoming script.
Determines whether to accept requests from this specific NAS.
The Cisco Access Registrar RADIUS server receives an
Access-Request packet from a NAS.
The client’s IP address listed in
/Radius/Clients/<Name>/IPAddress.
A script referred to in /Radius/IncomingScript.
The vendor listed in /Radius/Clients/Name/Vendor, and is
a script referred to in
/Radius/Vendors/<Name>/IncomingScript.
A script referred to in
/Radius/Clients/<Name>/IncomingScript.
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Table 2-3 Client or NAS Scripting Points (continued)
Action Explanation
/Radius/Advanced/RequireNASsBehindProxyBeInClie
ntList set to TRUE.
The NAS’s Identifier listed in /Radius/Clients/<Name>,
or its NAS-IP-Address listed in
/Radius/Clients/<Name>/IPAddress.
If the client’s IP address listed in /Radius/Clients/<Name>/IPAddress is
different:
*Executes the vendor’s
incoming script.
*Executes the client’s
incoming script.
The vendor listed in /Radius/Clients/Name/Vendor, and is
a script referred to in
/Radius/Vendors/<Name>/IncomingScript.
The client listed in the previous /Radius/Clients/Name, and
is a script referred to in
/Radius/Clients/Name/IncomingScript.
Authentication and/or Authorization Scripting Points
Table 2 - 4 shows the location of the scripting points within the section that determines whether to
perform authentication and/or authorization.
Table 2-4 Authentication and Authorization Scripting Points
Action Explanation
Determines Service to
use for authentication
and/or authorization.
Performs
authentication and/or
authorization.
*Executes the
Service’s incoming
script.
Performs
authentication and/or
authorization.
*Executes the
Service’s outgoing
script.
The Service name defined in the Environment dictionary
variable Authentication-Service, and is the same as the
Service defined in the Environment dictionary variable
Authorization-Service.
The Service name referred to by
/Radius/DefaultAuthenticationService, and is the same
as the Service defined in
/Radius/DefaultAuthorizationService.
If the Services are the same, perform authentication and
authorization.
If the Services are different, just perform authentication.
A script referred to in
/Radius/Services/<Name>/IncomingScript.
Based on the Service type defined in
/Radius/Services/<Name>/<Type>.
A script referred to in
/Radius/Services/<Name>/OutgoingScript.
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Action Explanation
Determines whether to
perform authorization.
*Executes the
Service’s incoming
script.
Performs
authorization.
*Executes the
Service’s outgoing
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.
Program Flow
The Service name defined in
/Radius/DefaultAuthorizationService, if different than
the Authentication Service.
A script referred to in
/Radius/Services/<Name>/IncomingScript.
Checks that the Service type is defined in
/Radius/Services/<Name>/<Type>.
A script referred to in
/Radius/Services/<Name>/OutgoingScript.
Table 2 - 5 describes how Cisco Access Registrar handles session management.
Table 2-5 Session Management Processing
Action Explanation
Determines whether
to perform session
management.
Performs session
management.
Performs resource
management.
Sends an
Access-Accept.
The session management defined in the Environment
dictionary variable Session-Manager.
The session management name referred to in
/Radius/DefaultSessionManager.
Selects Session Manager as defined in
/Radius/SessionManagers/<Name>.
Directs the request to the appropriate Resource manager
listed in
/Radius/SessionManagers/<Name>/ResourceManagers/<
Name>, which then allocates or checks the resource
according to the type listed in
/Radius/ResourceManagers/<Name>/<Type>.
Creates and formats the response, and sends it back to the
client (NAS).
Failover by the NAS and Session Management
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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:
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Program Flow
Note It may be possible to avoid this situation by having a disk drive shared between two systems
Chapter 2 Understanding Cisco Access Registrar
• The secondary server will not know about the current active sessions that are maintained on the
primary server. Any resources managed by the secondary server must be distinct from those
managed by the primary server, otherwise it will be possible to have two sessions with the same
resources (for example, two sessions with the same IP address).
• The primary server will miss important information that allows it to maintain a correct model of
what sessions are currently active (because the authentication and accounting requests are being sent
to the secondary server). This means when the primary server comes back online and the NAS begins
using it, its knowledge of what sessions are active will be out-of-date and the resources for those
sessions are allocated even if they are free to allocate to someone else.
For example, the user-session-limit resource may reject new sessions because the primary server
does not know some of the users using the resource logged out while the primary server was off-line.
It may be necessary to release sessions manually using the aregcmd command release-session.
with the second RADIUS server started up once the primary server has been determined to
be off-line. For more information on this setup, contact Technical Support.
Script Processing Hierarchy
For request packets, the script processing order is from the most general to the most specific. For
response packets, the processing order is from the most specific to the most general.
Table 2 - 6 , Tabl e 2 -7, and Ta b le 2 -8 show the overall processing order and flow:
(1-6) Incoming Scripts, (7-11) Authentication/Authorization Scripts, and (12-17) Outgoing Scripts.
Note The client and the NAS can be the same entity, except when the immediate client is acting
as a proxy for the actual NAS.
Table 2-6 Cisco Access Registrar Processing Hierarchy for Incoming Scripts
Overall Flow Sequence Incoming Scripts
1) Radius
2) Vendor of the immediate client.
3) Immediate client.
4) Vendor of the specific NAS.
5) Specific NAS
6) Service
2-8
Table 2-7 Cisco Access Registrar Processing Hierarchy for
Authentication/Authorization Scripts
Overall Flow Sequence Authentication/Authorization Scripts
7) Group Authentication.
8) User Authentication.
9) Group Authorization.
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Cross Server Session and Resource Management
Overall Flow Sequence Authentication/Authorization Scripts
10) User Authorization.
11) Session Management.
Table 2-8 Cisco Access Registrar Processing Hierarchy for Outgoing Scripts
Overall Flow Sequence Outgoing Scripts
12) Service
13) Specific NAS.
14) Vendor of the specific NAS.
15) Immediate client.
16) Vendor of the immediate client.
17) Radius
Cross Server Session and Resource Management
Prior to Cisco AR1.6, sessions and resources were managed locally, meaning that in a multi-AR server
environment, resources such as IP addresses, user-based session limits, and group-based session limits
were divided between all the Cisco ARservers. It also meant that, to ensure accurate session tracking, all
packets relating to one user session were required to go to the same Cisco ARserver.
Overview
Cisco Access Registrar 1.6 and above can manage sessions and resources across AAA server boundaries.
A session can be created by an Access-Request sent to AR1, and it can be removed by an
Accounting-Stop request sent to AR2, as shown in Figure 2-1. This enables accurate tracking of User
and Group session L across multiple AAA servers, and IP addresses allocated to sessions are managed
in one place.
Figure 2-1 Multiple Cisco AR Servers
AR1
AR2
AR3
Central Resource AR
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All resources that must be shared cross multiple front line Cisco AR servers are configured in the Central
Resource Cisco AR server. Resources that are not shared can still be configured at each front line Cisco
AR server as done prior to the Cisco AR 1.6 release.
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Cross Server Session and Resource Management
When the front line Cisco AR server receives the access-request, it does the regular AA processing. If
the packet is not rejected and a Central Resource Cisco AR server is also configured, the front line Cisco
AR server will proxy the packet
1
to the configured Central Resource Cisco AR. If the Central Resource
Cisco AR server returns the requested resources, the process continues to the local session management
(if local session manager is configured) for allocating any local resources. If the Central Resource Cisco
AR server cannot allocate the requested resource, the packet is rejected.
When the Accounting-Stop packet arrives at the frontline Cisco AR, it does the regular accounting
processing. Then, if the front line Cisco AR server is configured to use Central Resource Cisco AR, a
proxy packet will be sent to Central Resource Cisco AR server for it to release all the allocated resources
for this session. After that, any locally allocated resources are released by the local session manager.
Session-Service Service Step and Radius-Session Service
A new Service step has been added in the processing of Access-Request and Accounting packets. This
is an additional step after the AA processing for Access packet or Accounting processing for Accounting
packet, but before the local session management processing. The Session-Service should have a service
type of Radius-Session.
An environment variable Session-Service is introduced to determine the Session-Service dynamically.
You can use a script or the policy engine to set the Session-Service environment variable.
Configuring a Front Line Cisco Access Registrar
To use a Central Resource server, the DefaultSessionService property must be set or the Session-Service
environment variable must be set through a script or the policy engine. The value in the Session-Service
variable overrides the DefaultSessionService.
The configuration parameters for a Session-Service service type are the same as those for configuring a
radius service type for proxy, except the service type is radius-session.
The configuration for a Session-Service Remote Server is the same as configuring a proxy server.
[ //localhost/Radius ]
Name = Radius
Description =
Version = 1.7R0
IncomingScript =
OutgoingScript =
DefaultAuthenticationService = local-users
DefaultAuthorizationService = local-users
DefaultAccountingService = local-file
DefaultSessionService = Remote-Session-Service
DefaultSessionManager = session-mgr-1
[ //localhost/Radius/Services ]
Remote-Session-Service/
Name = Remote-Session-Service
Description =
Type = radius-session
1. The proxy packet is actually a resource allocation request, not an Access Request.
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IncomingScript =
OutgoingScript =
OutagePolicy = RejectAll
OutageScript =
MultipleServersPolicy = Failover
RemoteServers/
1. central-server
[ //localhost/Radius/RemoteServers ]
central-server/
Name = central-server
Description =
Protocol = RADIUS
IPAddress = 209.165.200.224
Port = 1645
ReactivateTimerInterval = 300000
SharedSecret = secret
Vendor =
IncomingScript =
OutgoingScript =
MaxTries = 3
InitialTimeout = 2000
AccountingPort = 1646
Cross Server Session and Resource Management
Configure Central AR
Resources at the Central Resource server are configured the same way as local resources are configured.
These resources are local resources from the Central Resource server’s point of view.
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Cisco Access Registrar Scripts
This chapter describes the scripts provided with Cisco Access Registrar.
Using Cisco AR Scripts
The Cisco Access Registrar scripts are stored in /localhost/Radius/Scripts. Most of the scripts are
written in the RADIUS Extension language (REX). Some scripts are provided in both REX and Tcl. The
scripts written in Tcl all begin with the letter t followed by their functional name. The Tcl scripts are
listed below:
tACMEOutgoingScript
tAuthorizePPP
tAuthorizeService
tAuthorizeTelnet
tMapSourceIPAddress
tParseAARealm
tParseAASRealm
tParseProxyHints
tParseServiceAndAAARealmHints
tParseServiceAndAAASRealmHints
tParseServiceAndAARealmHints
tParseServiceAndAASRealmHints
tParstSericeAndProxyHints
tParseServiceHints
CHA P TER
3
ACMEOutgoingScript
ACMEOutgoingScript is referenced from Vendor ACME for the outgoing script. If the Cisco AR server
accepts this Access-Request and the response does not yet contain a Session-Timeout, set it to 3600
seconds.
AltigaIncomingScript
AltigaIncomingScript maps Altiga-proprietary attributes to Cisco Access Registrar’s global attribute
space.
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AltigaOutgoingScript
AltigaOutgoingScript maps Altiga attributes from Cisco Access Registrar’s global attribute space to the
appropriate Altiga-proprietary attributes.
ANAAAOutgoing
ANAAAOutgoing can be referenced from either the client or vendor outgoing scripting point to be used
in HRPD/EV-DO networks where Cisco Access Registrar is the Access Network (AN) AAA server.
ANAAAOutgoing checks to see if the response contains the Callback-Id attribute. If the response
contains the Callback-Id attribute and the value is less than 253 characters, ANAAAOutgoing prefixes a
zero (0) to the value. For example, it changes "123" into "0123." The ANAAAOutgoing script always
returns REX_OK.
AscendIncomingScript
AscendIncomingScript maps Ascend-proprietary attributes to Cisco Access Registrar’s global attribute
space.
Chapter 3 Cisco Access Registrar Scripts
AscendOutgoingScript
AscendOutgoingScript maps Ascend attributes from Cisco Access Registrar’s global attribute space to
the appropriate Ascend-proprietary attributes.
AuthorizePPP
AuthorizePPP is referenced from either the use record for users who’s sessions are always PPP or from
the from the script AuthorizeService, which checks the request to determine which service is desired.
This script merges in the Profile named "default-PPP-users" into the response dictionary.
AuthorizeService
AuthorizeService is referenced from user record for users who’s sessions might be PPP, SLIP or Telnet
depending on how they are connecting to the NAS. This script checks the request to determine which
service is desired. If it is telnet, it calls the script AuthorizeTelnet. If it is PPP, it calls the script
AuthorizePPP. If it is SLIP, it calls the script AuthorizeSLIP. If it is none of these, it rejects the request.
AuthorizeSLIP
AuthorizeSLIP is referenced from either the user record for users who’s sessions are always SLIP or
from the from the script AuthorizeService, which checks the request to determine which service is
desired. This script merges in the Profile named "default-SLIP-users" into the response dictionary.
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AuthorizeTelnet
AuthorizeTelnet is referenced from either the user record for users who’s sessions are always telnet or
from the from the script AuthorizeService, which checks the request to determine which service is
desired. This script merges in the Profile named "default-Telnet-users" into the response dictionary.
CabletronIncoming
CabletronIncoming maps Cabletron-proprietary attributes to Cisco Access Registrar’s global attribute
space.
CabletronOutgoing
Use CabletronOutgoing to map Cisco-proprietary attributes from Cisco Access Registrar’s global
attribute space to the appropriate Cabletron-proprietary attributes.
Using Cisco AR Scripts
CiscoIncoming
Use CiscoIncoming to map Cisco-proprietary attributes to Cisco Access Registrar’s global attribute
space.
CiscoOutgoing
Use CiscoOutgoing to map Cisco-proprietary attributes from Cisco Access Registrar’s global attribute
space to the appropriate Cabletron-proprietary attributes.
CiscoWithODAPIncomingScript
Use CiscoWithODAPIncomingScript to map Cisco-proprietary attributes to Cisco Access Registrar’s
global attribute space and to map ODAP requests to the appropriate services and session managers.
CiscoWithODAPIncomingScript checks the incoming NAS-Identifier sent by the client. If the
NAS-Identifier does not equal odap-dhcp, the request is not an ODAP request. If the request is not an
ODAP request, the script does no more ODAP-specific processing, and calls CiscoIncomingScript to
allow it to process the request.
If the request is an ODAP request, CiscoWithODAPIncomingScript removes the NAS-Identifier
attribute because it is no longer required. The script then sets the Authentication-Service and the
Authorization-Service to odap-users and sets the Accounting-Service to odap-accounting.
ExecCLIDRule
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ExecCLIDRule is referenced from the policy engine to determine the authentication and authorization
service and policy based on the CLID set in the policy engine.
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ExecDNISRule
ExecDNISRule is referenced from the policy engine to determine the authentication and authorization
service and policy based on the DNIS set in the policy engine.
ExecFilterRule
ExecFilterRule is referenced from the policy engine to determine whether a user packet should be
rejected or not based on whether a special character like "*", "/", "\" or "?" shows up in the packet.
ExecNASIPRule
ExecNASIPRule is referenced from the policy engine to enable configuration of policies based on the
incoming NAS-IP-Address. You can configure two attributes, client-ip-address and subnetmask, to
match the incoming NAS-IP-Address and its subnet mask. If the attributes match, ExecNASIPrule sets
the environment variables (if they are configured in that rule).
Chapter 3 Cisco Access Registrar Scripts
ExecRealmRule
ExecRealmRule is referenced from the policy engine to determine the authentication and authorization
service and policy based on the realm set in the policy engine.
ExecTimeRule
ExecTimeRule either rejects or accepts Access Request packets based on the time range specified in a
user’s login profile. You can configure the TimeRange and AcceptedProfile attributes.
The format for the TimeRange is to set the allowable days followed by the allowable times, as in:
The dateRange can be in the form of a date, a range of allowable dates, a day, or a range of allowable
days. The timeRange should be in the form of hh:mm-hh:mm.
Here are a few examples:
TimeRange = dateRange, timeRange
mon-fri,09:00-17:00
Allows access Monday through Friday from 9 AM until 5 PM.
mon,09:00-17:00;tue-sat,12:00-13:00
Allows access on Monday from 9 AM until 5 PM and from 12 noon until 1 PM on Tuesday
through Saturday
mon,09:00-24:00;tue,00:00-06:00
Allows access on Monday from 9 AM until Tuesday at 6 AM
1-13,10-17:00; 15,00:00-24:00
3-4
Allows access from the first of the month until the thirteenth of the month from 10 AM until 5
PM and all day on the fifteenth of the month.
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LDAPOutage
LDAPOutage is referenced from LDAP Services as OutageScript. LDAPOutage logs when the LDAP
binding is lost.
MapSourceIPAddress
MapSourceIPAddress is referenced from the Cisco Access Registrar server's IncomingScript scripting
point. MapSourceIPAddress checks to see if the request contains either a NAS-Identifier or a
NAS-IP-Address. If not, this script sets the NAS-IP-Address from the request's source IP address.
The Tcl version of this script is tMapSourceIPAddress.
ParseAAARealm
ParseAAARealm is referenced from the NAS IncomingScript scripting point. It looks for a realm name
on the user name attribute as a hint of which AAA service should be used for this request. If @<realm>
is found, the AAA service is selected which has the same name as the realm.
Using Cisco AR Scripts
ParseAAASRealm
ParseAAASRealm is referenced from the NAS incoming script extension point. ParseAAASRealm looks
for a realm name on the user name attribute as a hint of which AAA service and which SessionManager
should be used for this request. If @<realm> is found, the AAA service and SessionManager which have
the same name as the realm are selected.
ParseAARealm
ParseAARealm is referenced from the NAS IncomingScript scripting point. It looks for a realm name on
the user name attribute as a hint of which authentication and authorization service should be used for
this request. If @<realm> is found, it selects the AA service that has the same name as the realm and the
DefaultAccountingService (as specified in the configuration by the administrator).
The Tcl version of this script is named tParseAARealm.
ParseAASRealm
ParseAASRealm is referenced from the NAS IncomingScript scripting point. It looks for a realm name
on the user name attribute as a hint of which AA service and which SessionManager should be used for
this request. If @<realm> is found, the AA service and the SessionManager which have the same name
as the realm are selected. The Accounting service will be the DefaultAccountingService (as specified in
the configuration by the administrator).
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The Tcl version of this script is named tParseAASRealm.
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ParseProxyHints
ParseProxyHints is referenced from the NAS IncomingScript scripting point. It looks for a realm name
on the user name attribute as a hint of which AAA services should be used for this request. If @radius
is found, a set of AAA services is selected which will proxy the request to a remote radius server. If
@tacacs is found, the AuthenticationService is selected that will proxy the request to a tacacs server for
authentication. For any services not selected, the default service (as specified in the configuration by the
administrator) will be used.
The Tcl version of this script is named tParseProxyHints.
ParseServiceAndAAARealmHints
ParseServiceAndAAARealmHints is referenced from the NAS IncomingScript scripting point. It calls
both ParseServiceHints and ParseAAARealm.
The Tcl version of this script is named tParseServiceAndAAARealmHints.
Chapter 3 Cisco Access Registrar Scripts
ParseServiceAndAAASRealmHints
ParseServiceAndAAASRealmHints is referenced from the NAS IncomingScript scripting point. It calls
both ParseServiceHints and ParseAAASRealm.
The Tcl version of this script is named tParseServiceAndAAASRealmHints.
ParseServiceAndAARealmHints
ParseServiceAndAARealmHints is referenced from the NAS IncomingScript scripting point. It calls
both ParseServiceHints and ParseAARealm.
The Tcl version of this script is named tParseServiceAndAARealmHints.
ParseServiceAndAASRealmHints
ParseServiceAndAASRealmHints is referenced from the NAS IncomingScript scripting point. It calls
both ParseServiceHints and ParseAASRealm.
The Tcl version of this script is named tParseServiceAndAASRealmHints.
ParseServiceAndProxyHints
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ParseServiceAndProxyHints is referenced from the NAS IncomingScript scripting point. It calls both
ParseServiceHints and ParseProxyHints.
The Tcl version of this script is named tParseServiceAndProxyHints.
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Chapter 3 Cisco Access Registrar Scripts
ParseServiceHints
ParseServiceHints is referenced from the NAS IncomingScript scripting point. Check to see if we are
given a hint of the service type or the realm. If so, set the appropriate attributes in the request or radius
dictionary to record the hint and rewrite the user name to remove the hint.
The Tcl version of this script is named tParseServiceHints.
ParseTranslationGroupsByCLID
ParseTranslationGroupsByCLID is referenced from the policy engine to determine the incoming and
outgoing translation groups based on CLID set in the policy engine so that the attributes can be added
and/or filtered out by the configuration data set in MCD.
ParseTranslationGroupsByDNIS
ParseTranslationGroupsByDNIS is referenced from the policy engine to determine the incoming and
outgoing translation groups based on realm set in the policy engine so that the attributes can be
added/filtered out by the configuration data set in MCD.
Using Cisco AR Scripts
ParseTranslationGroupsByRealm
ParseTranslationGroupsByRealm is referenced from the policy engine to determine the incoming and
outgoing translation groups based on the realm set in the policy engine.
ParseTranslationGroupsByRealm allows the attributes to be added or filtered out by the configuration
data set in MCD.
UseCLIDAsSessionKey
UseCLIDAsSessionKey is used to specify that the Calling-Station-Id attribute should be used as the
session key to correlate requests for the same session. This is a typical case for 3G mobile user session
correlation.
USRIncomingScript
USRIncomingScript maps USR-proprietary attributes to Cisco Access Registrar’s global attribute space.
USRIncomingScript-IgnoreAccountingSignature
USRIncomingScript-IgnoreAccountingSignature maps USR-proprietary attributes to Cisco Access
Registrar’s global attribute space and sets a flag to ignore the signature on Accounting-Request packets.
Earlier versions of the USR RADIUS client did not correctly sign Accounting-Request packets.
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Using Cisco AR Scripts
USROutgoingScript
USROutgoingScript maps USR attributes from Cisco Access Registrar’s global attribute space to the
appropriate USR-proprietary attributes.
Chapter 3 Cisco Access Registrar Scripts
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Understanding Replication
This chapter describes Cisco Access Registrar's configuration replication features, functions, limitations
and operation.
Replication Overview
Cisco Access Registrar replication feature can maintain identical configurations on multiple machines
simultaneously. When replication is properly configured, changes an administrator makes on the primary
or master machine are propagated by Cisco Access Registrar to a secondary or slave machine.
Replication eliminates the need to have administrators with multiple Cisco Access Registrar installations
make the same configuration changes at each of their installations. Instead, only the master's
configuration need be changed and the slave is automatically configured eliminating the need to make
repetitive, error-prone configuration changes for each individual installation. In addition to enhancing
server configuration management, using replication eliminates the need for a hot-standby machine.
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4
Using a hot-standby machine is a common practice to provide more fault-tolerance where a
fully-installed and configured system stands ready to takeover should the primary machine fail.
However, a system setup for hot-standby is essentially an idle machine only used when the primary
system fails. Hot-standby or secondary servers are expensive resources. Employing Cisco Access
Registrar's replication feature, both servers may perform RADIUS request processing simultaneously,
eliminating wasted resources.
The replication feature focuses on configuration maintenance only, not session information or
installation-specific information such as Administrator, Interface, Replication or Advanced
machine-specific configuration changes. These configuration items are not replicated because they are
specific to each installation and are not likely to be identical between master and slave. While changes
to Session Managers, Resource Manager, and Remote Servers are replicated to the slave and stored in
the slave's configuration database, they are not hot-configured on the slave (see Hot Configuration
Detailed below for more information)
Changes should be made only on the master server. Making changes on a slave server will not be
replicated and may result in an unstable configuration on the slave. Any changes made using replication
will not be reflected in existing aregcmd sessions. aregcmd only loads its configuration at start up; it is
not dynamically updated. For example, if aregcmd is running on the slave, and on the master aregcmd
is used to add a client, the new client, while correctly replicated and hot-configured, will not be visible
in the slave's aregcmd until aregcmd is exited and restarted.
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How Replication Works
Chapter 4 Understanding Replication
When there is a configuration change, the master server propagates the change set to all member servers
over the network. All member servers have to update their configuration after receiving the change set
notifications from master server. Propagating the change set to a member serve involves multiple packet
transfer from the master server to the member because the master serve has to convey all the
configuration changes to the member. The number of packets to be transferred depends on the size of
the change set.
After receiving a change set notification, the member server will go off-line before applying the change
set received from master server. This state is indicated by the log message
in name_radius_1_log file. When the change set is successfully applied, the member server goes up
automatically. This is indicated by the log message
file. When the member server goes off-line to apply the change set, no incoming packets are processed.
Due to the number of packets to be transferred in the change set and the amount of time the member
server will be offline updating its databasepoints, Cisco recommends that you use multiple save
commands rather than a large configuration change with one save command. You can also minimize the
number of changes that occur in a replication interval by modifying either the
RepTransactionArchiveLimit or the RepTransactionSyncInterval, or both of these properties. For
example, instead of using the default value of 100 for the RepTransactionArchiveLimit, you might
change it to 20.
Radius Server is On-Line in name_radius_1_log
Radius Server is Off-line
How Replication Works
This section describes the flow of a simple replication as it occurs under normal conditions.
Replication Data Flow
The following sections describe data flow on the master server and the slave server.
Master Server
The following describes the data flow for the master server:
Step 1 The administrator makes a change to the master server’s configuration using the aregcmd command line
interface (CLI) and issues a save command.
Step 2 After the changes are successfully validated, the changes are stored in the Access Registrar database.
Step 3 aregcmd then notifies the Access Registrar server executing on the master of the configuration change.
Step 4 The Access Registrar server then updates its version of the configuration stored in memory. (This is
called hot-config because it happens while the server is running and processing requests.)
Step 5 The Access Registrar server first copies the changes pertaining to the aregcmd save, also known as a
transaction to its replication archive, then transmits the transaction to the slave server for processing.
Step 6 In aregcmd, the prompt returns indicating that the save has completed successfully, the transaction has
been archived, and the transaction has been transmitted to the slaves.
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Chapter 4 Understanding Replication
Slave Server
Step 1 When the slave server receives the transaction, its contents are verified.
Step 2 Once verified, the changes are applied to the slave server's database
Step 3 The changes are then applied (hot-configured) in the slave server's in-memory configuration.
Step 4 The transaction is written to the slave server's replication archive.
Security
Replication has two primary security concerns:
• Security of the transactions transmitted to the slave server
• Storage of transactions in the replication archive
Both of these concerns use shared secret (MD5) encryption via the shared secret specified in the
replication configuration on both master and slave servers. Replication data transmitted between master
and slave is encrypted at the source and decrypted at the destination the same way as standard RADIUS
packets between Access Registrar's clients and the Access Registrar server. Transactions written to the
replication archive are also encrypted in the same manner and decrypted when read from the replication
archive.
How Replication Works
Replication Archive
The replication archive serves two primary purposes:
1. To provide persistent, or saved, information regarding the last successful transaction
2. To persist transactions in case the slave server requires re synchronization (see Ensuring Data
Integrity below for more information on re synchronization).
The replication archive is simply a directory located in ../CSCOar/data/archive. Each transaction
replicated by the master is written to this directory as a single file. The name of each transaction file is
of the form txn########## where ########## is the unique transaction number assigned by the master
server. The replication archive size, that is the number of transaction files it may contain, is configured
in the Replication configuration setting of TransactionArchiveLimit. When the TransactionArchive limit
is exceeded, the oldest transaction file is deleted.
Ensuring Data Integrity
Access Registrar's configuration replication feature ensures data integrity through transaction data
verification, transaction ordering, automatic resynchronization and manual full-resynchronization. With
the single exception of a manual full-resynchronization, each of the following techniques help to
automatically ensure that master and slave servers contain identical configurations. A detailed
description of each technique follows.
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How Replication Works
Transaction Data Verification
When the master prepares a transaction for replication to a slave, the master calculates a 2's complement
Cyclic Redundancy Check (CRC) for each element (individual configuration change) in the transaction
and for the entire transaction and includes these CRC values in the transmitted transaction. When the
slave receives the transaction, the slave calculates a CRC for each transaction element and for the entire
transaction and compares its own calculated values with those sent with the message. If a discrepancy
occurs from these comparisons, the transaction element or the entire transaction is discarded and a
re-transmission of that particular transaction element or the entire transaction is requested by the slave
from the master. This process is called automatic resynchronization. (described in more detail below)
Transaction Order
When the master prepares a transaction for replication, it assigns the transaction a unique transaction
number. This number is used to ensure the transactions are processed by the slave in exactly the same
order as they were processed on the master. Transactions are order dependent. Since the functionality of
Access Registrar's configuration replication feature is to maintain identical configurations between
master and slave, if transaction order were not retained, master and slave would not contain identical
configurations. Consider where two transactions modify the same thing (a defined client's IP address for
example). If the first transaction was a mistake and the second was the desired result, the client config
on the master would contain the second setting; however, if the transactions were processed in the
reverse order on the slave, the client config on the slave would contain the mistaken IP Address. This
example illustrates the critical need for transaction ordering to ensure data integrity.
Chapter 4 Understanding Replication
Automatic Resynchronization
Automatic Resynchronization is the most significant feature with respect to data integrity. This feature
ensures the configurations on both the master and slave are identical. If they are not, this feature
automatically corrects the problem.
When the master and slave start-up, they determine the transaction number of the last replication
transaction from their respective replication archives. The master immediately begins periodic
transmission of a TransactionSync message to the slave. This message informs the slave of the
transaction number of the transaction that the master last replicated.
If the transaction number in the TransactionSync message does not match the transaction number of the
last received transaction in the slave's archive, then the slave will request resynchronization from the
master. The resynchronization request sent by the slave will include the slave's last received transaction
number.
The master will respond by retransmitting each transaction since the last transaction number indicated
by the slave in the resynchronization request. The master obtains these transactions from its replication
archive.
Should the slave's last received transaction number be less than the lowest transaction number in the
master's replication archive, then automatic resynchronization cannot occur as the master's replication
archive does not contain enough history to synchronize the slave. In this case, the slave must be
resynchronized with a full-resynchronization.
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Chapter 4 Understanding Replication
Full Resynchronization
Full Resynchronization means that the slave has missed more transactions than are stored in the master's
replication archive and cannot be resynchronized automatically. There is no automatic
full-resynchronization mechanism in Access Registrar's configuration replication feature. To perform a
full resynchronization, refer to the Cisco Access Registrar User’s Guide.
Understanding Hot-Configuration
Hot-Configuration is the process of reflecting configuration changes made to Access Registrar's internal
configuration database in the in-memory configuration of the executing Access Registrar server.
Hot-Configuration is accomplished without interruption of RADIUS request processing. For example,
if an administrator uses aregcmd to configure a new client and issues a save command, when the prompt
returns, the newly configured client may send requests to Access Registrar.
Hot-Configuration minimizes the down-time associated with having to restart an Access Registrar server
to put configuration changes into effect. With the Hot-Configuration feature, a restart is only necessary
when a Session Manager, Resource Manager or Remote Server configuration is modified. These
configuration elements may not be hot-configured because they maintain state (an active session, for
example) and cannot be modified without losing the state information they maintain. Changes to these
configuration elements require a restart of Access Registrar to put them into effect.
Hot-Configuration is not associated with the replication feature. Hot-Configuration’s only connection to
the replication feature is that when a change is replicated to the slave, the slave is hot-configured to
reflect the replicated change as if an administrator had used aregcmd to make the changes directly on
the slave server.
Replication Configuration Settings
Replication’s Impact on Request Processing
The replication feature was designed to perform replication of transactions with minimal impact on
RADIUS request processing. When a transaction is received by a slave, RADIUS requests are queued
while the transaction is applied to the slave. Once the transaction is complete, RADIUS request
processing resumes.
The impact on RADIUS request processing is a direct result of the size of a transaction. The smaller the
transaction the lesser the impact, and the larger the transaction, the greater the impact. In other words,
when making changes to the master, frequent saves are better than making lots of changes and then
saving. Each change is one transaction element and all changes involved in a save comprise a single
transaction with one element per change. Since the replication feature only impacts RADIUS request
processing when changes are made, the impact under normal operation (when changes are not being
made) is virtually unmeasurable.
Replication Configuration Settings
This section describes each replication configuration setting. In aregcmd, replication settings are found
in //localhost/Radius/Replication.
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Replication Configuration Settings
RepType
RepType indicates the type of replication. The choices available are SMDBR and NONE.
When RepType is set to NONE, replication is disabled. To enable replication, set RepType to SMDBR
for Single Master DataBase Replication. RepType must be set to SMDBR on both the master and slave
servers.
RepTransactionSyncInterval
Master
On the master server, RepTransactionSyncInterval is the duration between periodic transmission of the
TransactionSync message expressed in milliseconds. The default is 60000 or 1 minute.
The purpose of RepTransactionSyncInterval is to indicate how frequently to check for an out-of -sync
condition between the master and slave servers. When the slave received the TransactionSync message,
it uses its contents to determine if it needs to resynchronize with the master.
The larger the setting for RepTransactionSyncInterval, the longer the period of time between out-of-sync
detection. However, if RepTransactionSyncInterval is set too small, the slave may frequently request
resynchronization when it is not really out of sync. If the duration is too small, the slave cannot
completely receive a transaction before it receives the TransactionSync message. In this case, the servers
will remain synchronized, but there will be unnecessary excess traffic that could affect performance.
Chapter 4 Understanding Replication
Slave
On the slave, RepTransactionSyncInterval is used to determine if the slave has lost contact with the
master and to alert administrators of a possible loss of connectivity between the master an slave. If the
elapsed time since the last received TransactionSync message exceeds the setting of
RepTransactionSyncInterval, the slave writes a log message indicating that it may have lost contact with
the master. This log message is repeated each TransactionSyncInterval until a TransactionSync message
is received.
RepTransactionArchiveLimit
On both master and slave, the RepTransactionArchiveLimit setting determines how many transactions
can be stored in the archive. The default setting is 100. When the limit is exceeded, the oldest transaction
file is deleted. If a slave requires resynchronization and the last transaction it received is no longer in the
archive, a full resynchronization will be necessary to bring the slave back in sync with the master.
Note The value set for RepTransactionArchiveLimit should be the same on the master and the slave.
An appropriate value for RepTransactionArchiveLimit depends upon how much hard disk space an
administrator can provide for resynchronization. If this value is large, say 10,000, then the last 10,000
transactions will be stored in the archive. This is like saying the last 10,000 saves from aregcmd will be
stored in the archive. Large values are best. The size of each transaction depends upon how many
configuration changes were included in the transaction, so hard disk space usage is difficult to estimate.
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Chapter 4 Understanding Replication
If the slave should go down or otherwise be taken off line, the value of RepTransactionArchiveLimit and
the frequency of aregcmd saves will determine how long the slave may be off-line before a
full-resynchronization will be required.
There are two reasons why a slave server should have an archive:
1. The slave must save the last received transaction for resynchronization purposes (at a minimum).
2. Should the master go down, the slave can then be configured as the master and provide
RepIPAddress
The RepIPAddress value is set to the IP Address of the machine containing the Access Registrar
installation.
RepPort
Replication Configuration Settings
resynchronization services to other slaves.
The RepPort is the port used to receive of replication messages. In most cases, the default value (1645)
is sufficient. If another port is to be used, the interfaces must exist in the machine.
RepSecret
RepSecret is the replication secret shared between the master and slave. The value of this setting must
be identical on both the master and the slave.
RepIPMaster
The RepIPMaster setting indicates whether the machine is a master or a slave. On the master, set
RepIPMaster to TRUE. On the slave set it to FALSE. Only the master may have this value set to TRUE
and there can be only one master.
RepMasterIPAddress
RepMasterIPAddress specifies the IP Address of the master. On the master, set RepMasterIPAddress to
the same value used in RepIPAddress above. On the slave, RepMasterIPAddress must be set to the IP
Address of the master.
RepMasterPort
RepMasterPort is the port to use to send replication messages to the master. In most cases, the default
value (1645) is sufficient; however, if another is to be used, the interfaces must exist in the machine.
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Replication Configuration Settings
Rep Members Subdirectory
The Rep Members\ subdirectory contains the list of slaves to which the master will replicate
transactions.
Rep Members/Slave1
Each slave is added much like a client is added. Each slave must have a configuration in the Rep
Members directory to be considered part of the replication network by the master. The master will not
transmit any messages or replications to servers not in this list, and any communication received by a
server not in this list will be ignored.
Note Although it is possible to configure multiple slaves with the same master, we have only considered a
single-master/single-slave configuration. This is the recommended configuration.
Name
Chapter 4 Understanding Replication
IPAddress
Port
This is the name of the slave. The name must be unique.
This is the IP Address of the slave.
This is the port upon which the master will send replication messages to the slave.
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Overview
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Understanding SNMP
This chapter provides information about Cisco Access Registrar support for SNMP.
Cisco Access Registrar 3.0 provides SNMP MIB and trap support for users of network management
systems. The supported MIBs enable the network management station to collect state and statistic
information from an Cisco AR server. The traps enable Cisco AR to notify interested network
management stations of failure or impending failure conditions.
Cisco Access Registrar supports the MIBs defined in the following RFCs:
• RADIUS Authentication Client MIB, RFC 2618
• RADIUS Authentication Server MIB, RFC 2619
• RADIUS Accounting Client MIB, RFC 2620
• RADIUS Accounting Server MIB, RFC 2621
Cisco Access Registrar 3.0 MIB support enables a standard SNMP management station to check the
current state of the server as well as the statistics on each client or each proxied remote server.
Cisco Access Registrar 3.0 Trap support enables a standard SNMP management station to receive trap
messages from an Cisco AR server. These messages contain information indicating that either the server
was brought up or down, or that the proxied remote server is down or has come back online.
Supported MIBs
The MIBs supported by Access Registrar enable a standard SNMP management station to check the
current state of the server and statistics for each client or proxied remote server.
RADIUS-AUTH-CLIENT-MIB
The RADIUS-AUTH-CLIENT-MIB describes the client side of the RADIUS authentication protocol.
The information contained in this MIB is useful when an Cisco AR server is used as a proxy server.
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SNMP Traps
RADIUS-AUTH-SERVER-MIB
The RADIUS-AUTH-SERVER-MIB describes the server side of the RADIUS authentication protocol.
The information contained in this MIB describes managed objects used for managing a RADIUS
authentication server.
RADIUS-ACC-CLIENT-MIB
The RADIUS-ACC-CLIENT-MIB describes the client side of the RADIUS accounting protocol. The
information contained in this MIB is useful when an Cisco AR server is used for accounting.
RADIUS-ACC-SERVER-MIB
The RADIUS-ACC-CLIENT-MIB describes the server side of the RADIUS accounting protocol. The
information contained in this MIB is useful when an Cisco AR server is used for accounting.
Chapter 5 Understanding SNMP
SNMP Traps
The traps supported by Access Registrar enable a standard SNMP management station to receive trap
messages from an Cisco AR server. These messages contain information indicating whether a server was
brought up or down, or that the proxied remote server is down or has come back online.
A trap is a network message of a specific format issued by an SNMP entity on behalf of a network
management agent application. A trap is used to provide the management station with an asynchronous
notification of an event.
When a trap is generated, a single copy of the trap is transmitted as a trap PDU to each destination
contained within a list of trap recipients.
The list of trap recipients is shared by all events and is determined at server initialization time along with
other trap configuration information. The list of trap recipients dictates where Cisco AR traps are
directed.
The configuration of any other SNMP agent on the host is ignored. By default, all traps are enabled but
no trap recipients are defined. By default, no trap is sent until trap recipients are defined.
Traps are configured using the command line interface (CLI). After configuring traps, the configuration
information is re initialized when a server reload or restart occurs.
When you configure traps, you must provide the following information:
• List of trap recipients (community string for each)
• Suppressing traps for any type of message
• Frequency of traps for any type of message
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Chapter 5 Understanding SNMP
Supported Traps
The traps supported by Cisco Access Registrar enable Cisco AR to notify interested management
stations of events, failure, or impending failure conditions. Traps are a network message of a specific
format issued by an SNMP entity on behalf of a network management agent application. Traps are used
to provide the management station with an asynchronous notification of an event.
carServerStart
carServerStart signifies that the server has started on the host from which this notification was sent.
This trap has one object, carNotifStartType, which indicates the start type. A firstStart indicates this is
the server process’ first start. reload indicates this server process has an internal reload. This typically
occurs after rereading some configuration changes, but reload indicates this server process did not quit
during the reload process.
carServerStop
carServerStop signifies that the server has stopped normally on the host from which this notification
was sent.
SNMP Traps
carInputQueueFull
carInputQueueFull indicates that the percentage of use of the packet input queue has reached its high
threshold. This trap has two objects:
• carNotifInputQueueHighThreshold—indicates the high limit percentage of input queue usage
• carNotifInputQueueLowThreshold—indicates the low limit percentage of input queue usage
By default, carNotifInputQueueHighThreshold is set to 90% and carNotifInputQueueLowThreshold is
set to 60%.
Note The values for these objects cannot be changed at this time. You will be able to modify them in a future
release of Cisco Access Registrar.
After this notification has been sent, another notification of this type will not be sent again until the
percentage usage of the input queue goes below the low threshold.
If the percentage usage reaches 100%, successive requests may be dropped, and the server may stop
responding to client requests until the queue drops down again.
carInputQueueNotVeryFull
carInputQueueNotVeryFull indicates that the percentage usage of the packet input queue has dropped
below the low threshold defined in carNotifInputQueueLowThreshold. This trap has two objects:
• carNotifInputQueueHighThreshold—indicates the high limit percentage of input queue usage
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• carNotifInputQueueLowThreshold—indicates the low limit percentage of input queue usage
After this type of notification has been sent, it will not be sent again until the percentage usage goes back
up above the high threshold defined in carNotifInputQueueHighThreshold.
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SNMP Traps
carOtherAuthServerNotResponding
carOtherAuthServerNotResponding indicates that an authentication server is not responding to a
request sent from this server. This trap has three objects:
• radiusAuthServerAddress—indicates the identity of the concerned server
• radiusAuthClientServerPortNumber—indicates the port number of the concerned server
• carAuthServerType—indicates the type of the concerned server
The index of these three objects identifies the entry in radiusAuthServerTable and carAccServerExtTable
which maintains the characteristics of the concerned server.
Note One should not rely solely on carOtherAuthServerNotResponding for server state. Several conditions,
including a restart of the Cisco AR server, could result in either multiple
carOtherAuthServerNotResponding notifications being sent or in a carOtherAuthServerResponding
notification not being sent. NMS can query the carAuthServerRunningState in carAuthServerExtTable
for the current running state of this server.
Chapter 5 Understanding SNMP
carOtherAuthServerResponding
carOtherAuthServerResponding signifies that an authentication server which had formerly been in a
down state is now responding to requests from the Cisco AR server. This trap has three objects:
• radiusAuthServerAddress—indicates the identity of the concerned server
• radiusAuthClientServerPortNumber—indicates the port number of the concerned server
• carAuthServerType—indicates the type of the concerned server
The index of these three objects identifies the entry in radiusAuthServerTable and carAccServerExtTable
which maintains the characteristics of the concerned server.
One should not rely on receiving this notification as an indication that all is well with the network.
Several conditions, including a restart of the Cisco AR server, could result in either multiple
carOtherAuthServerNotResponding notifications being sent or in a carOtherAuthServerResponding
notification not being sent. The NMS can query the carAuthServerRunningState in
carAuthServerExtTable for the current running state of this server.
carOtherAccServerNotResponding
carOtherAuthServerNotResponding signifies that an accounting server is not responding to the
requests sent from this server. This trap has three objects:
• radiusAccServerAddress—indicates the identity of the concerned server
• radiusAccClientServerPortNumber—indicates the port number of the concerned server
• carAcchServerType—indicates the type of the concerned server
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The index of these three objects identifies the entry in radiusAuthServerTable and arAccServerExtTable
which maintains the characteristics of the concerned server.
One should not solely rely on this for server state. Several conditions, including the restart of the Cisco
AR server, could result in either multiple carOtherAccServerNotResponding notifications being sent or
in a carOtherAccServerResponding notification not being sent. The NMS can query the
carAccServerRunningState in carAccServerExtTable for current running state of this server.
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carOtherAccServerResponding
carOtherAccServerResponding signifies that an accounting server that had previously sent a not
responding message is now responding to requests from the Cisco AR server. This trap has three objects:
• radiusAccServerAddress—indicates the identity of the concerned server
• radiusAccClientServerPortNumber—indicates the port number of the concerned server
• carAccServerType—indicates the type of the concerned server
The index of these three objects identifies the entry in radiusAuthServerTable and arAccServerExtTable
which maintains the characteristics of the concerned server.
One should not rely on the reception of this notification as an indication that all is well with the network.
Several conditions, including the restart of the Cisco AR server, could result in either multiple
carOtherAccServerNotResponding notifications being sent or in a carOtherAccServerResponding
notification not being sent. The NMS can query the carAccServerRunningState in carAccServerExtTable
for the current running state of this server.
carAccountingLoggingFailure
SNMP Traps
carAccountingLoggingFailure signifies that this Cisco AR server cannot record accounting packets
locally. This trap has two objects:
• carNotifAcctLogErrorReason—indicates the reason packets cannot be recorded locally
• carNotifAcctLogErrorInterval—indicates how long to wait until another notification of this type
might be sent. A value of 0 (zero) indicates no time interval checking, meaning that no new
notification can be sent until the error condition is corrected.
Configuring Traps
Cisco Access Registrar’s SNMP implementation uses various configuration files to configure its
applications.
Directories Searched
Configuration files can be found and read from numerous places. By default, SNMP applications look
for configuration files in the following three directories (in the order listed):
1. /usr/local/share/snmp/snmp.conf
This directory contains common configuration for the agent and the application. Refer to man page
snmp.conf(5) for details.
2. /usr/local/share/snmp/snmpd.conf
3. /usr/local/share/snmp/snmp.local.conf
This directory configures the agent. Refer to man page snmp.conf(5) for details.
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In each of these directories, an SNMP application looks for files with the extension .conf. The
application also looks for configuration files in default locations where a configuration file can exist for
any given configuration file type.
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5-5
SNMP Traps
These files are optional and are only used to configure the extensible portions of the agent, the values of
the community strings, and the optional trap destinations. By default, the first community string
(“public” by default) is allowed read-only access and the second (“private” by default) is allowed write
access, as well. The third to fifth community strings are also read-only.
Additionally, the above default search path can be over-ridden by setting the environmental variable
SNMPCONFPATH to a colon-separated list of directories to search.
Finally, applications that store persistent data will also look for configuration files in the /var/snmp
directory.
Configuration File Types
Each application may use multiple configuration files which will configure various different aspects of
the application. For instance, the SNMP agent (snmpd) knows how to understand configuration
directives in both the snmpd.conf and the snmp.conf files. In fact, most applications understand how to
read the contents of the snmp.conf files. Note, however, that configuration directives understood in one
file may not be understood in another file. For further information, read the associated manual page with
each configuration file type. Also, most of the applications support a '-H' switch on the command line
that will list the configuration files it will look for and the directives in each one that it understands.
The snmp.conf configuration file is intended to be a application suite-wide configuration file that
supports directives that are useful for controlling the fundamental nature of all of the SNMP
applications, such as how they all manipulate and parse the textual SNMP MIB files.
Chapter 5 Understanding SNMP
Switching Configuration Files in Mid-File
It's possible to switch in mid-file the configuration type that the parser is supposed to be reading. Since
that output for the agent by default, but you didn't want to do that for the rest of the applications (for
example, snmpget and snmpwalk, you would need to put a line like the following into the snmp.conf
file.
dumpPacket true
But, this would turn it on for all of the applications. So, instead, you can put the same line in the
snmpd.conf file so that it only applies to the snmpd demon. However, you need to tell the parser to expect
this line. You do this by putting a special type specification token inside a square bracket ([ ]) set. In
other words, inside your snmpd.conf file you could put the above snmp.conf directive by adding a line
like the following:
[
snmp] dumpPacket true
This tells the parser to parse the above line as if it were inside a snmp.conf file instead of an snmpd.conf
file. If you want to parse a bunch of lines rather than just one then you can make the context switch apply
to the remainder of the file or until the next context switch directive by putting the special token on a
line by itself:
# make this file handle snmp.conf tokens:
[snmp]
dumpPacket true
logTimestamp true
# return to our original snmpd.conf tokens:
[snmpd]
rocommunity mypublic
5-6
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Chapter 5 Understanding SNMP
Community String
A community string is used to authenticate the trap message sender (SNMP agent) to the trap recipient
(SNMP management station). A community string is required in the list of trap receivers.
SNMP Traps
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5-7
SNMP Traps
Chapter 5 Understanding SNMP
5-8
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Overview
CHA P TER
6
Prepaid Billing Solution
This chapter describes the generic call flow between the three components required to support a prepaid
billing solution using the RADIUS protocol: the AAA client, the Cisco Access Registrar 3.5 server, and
a prepaid billing server.
When a subscriber uses a prepaid billing service, each call requires a set of data about the subscriber.
However, the AAA network has no previous knowledge of the of the subscriber’s usage behavior. To
support the prepaid billing solution, Cisco AR 3.5 uses an iterative authorization paradigm over multiple
sessions.
Each time an authorization request is made, the billing server apportions a fraction of the subscriber’s
balance into a quota. When a subscriber uses multiple sessions, each session must obtain its own quota.
When a previously allocated quota is depleted, a session must be reauthorized to obtain a new quota.
Note The granularity and the magnitude of the quota is in the design and implementation of the prepaid billing
server and is beyond the scope of this document. In general, a smaller the quota generates more network
traffic, but allows more sessions per subscriber. When the quota is equal to a subscriber’s total account
balance, there is minimal network traffic, but only one session can be supported.
When a subscriber’s current quota is depleted, the AAA client initiates a reauthorization request sending
Access-Request packets. After the Cisco AR 3.5 server receives the request, it forwards the request to
the billing server. The billing server then returns the next quota to use. The new quota might not be the
same as the previous, and the billing server might adjust the quota dynamically.
Cisco Access Registrar 3.5 uses vendor-specific attributes (VSA) to extend the standard RADIUS
protocol to carry information not usually present in the standard RADIUS packet. Cisco AR 3.5 uses a
set of VSAs allocated to the Cisco VSA pool [26,9].
Cisco Access Registrar 3.5 required several different types of measurements to support a prepaid billing
solution. These measurements require the use of metering variables to perform usage accounting.
Table 6 - 1 lists the different measurements and what the AAA client, Cisco AR 3.5 server, and billing
server do with them.
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6-1
Overview
Chapter 6 Prepaid Billing Solution
Table 6-1 Measurements and Component Actions
Measurement Type Billing Server Action AAA Server Action AAA Client Action
Duration Return duration quota Convert duration quota
to VSAs and pass along
Total volume Return volume quota Convert volume quota
to VSAs and pass along
Uplink volume Return volume quota Convert volume quota
to VSAs and pass along
Downlink volume Return volume quota Convert volume quota
to VSAs and pass along
Total packets Return packet quota Convert packet quota to
VSAs and pass along
Uplink packets Return packet quota Convert packet quota to
VSAs and pass along
Downlink packets Return packet quota Convert packet quota to
VSAs and pass along
Logical OR of two
measurements
Return quota of both
measurements
Convert both to VSA
and pass along
Compare running
duration quota with
quota returned by Cisco
AR 3.5 server
Compare running
volume quota with
quota returned by Cisco
AR 3.5 server
Compare running
volume quota with
quota returned by Cisco
AR 3.5 server
Compare running
volume quota with
quota returned by Cisco
AR 3.5 server
Compare running
packet quota with quota
returned by Cisco AR
3.5 server
Compare running
packet quota with quota
returned by Cisco AR
3.5 server
Compare running
packet quota with quota
returned by Cisco AR
3.5 server
Monitor both quota and
issue reauthorization
packet when any one
trips
6-2
Cisco AR 3.5 provides maximum flexibility to billing servers by allowing the metering variable to be
modified as the service is used. This requires network nodes to measure all parameters all the time, but
to report values only after receiving a reauthorization request.
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Chapter 6 Prepaid Billing Solution
Configuring Prepaid Billing
Cisco AR 3.5 uses a prepaid service to support prepaid billing solutions. A prepaid service has the
following properties:
[ //localhost/Radius/Services/prepaid ]
Name = prepaid
Description =
Type = prepaid
IncomingScript~ =
OutgoingScript~ =
OutagePolicy~ = RejectAll
OutageScript~ =
MultipleServersPolicy = Failover
RemoteServers/
Under RemoteServers, you must list the RemoteServer object previously configured to support either
prepaid-crb or prepaid-is835c.
Detailed information about configuring prepaid billing is located in the Cisco Access Registrar
Installation and Configuration Guide.
Configuring Prepaid Billing
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6-3
Generic Call Flow
Chapter 6 Prepaid Billing Solution
Figure 6-1 Generic Call Flow Diagram
AAA client
1c 1s aaa_ebs_init_authenticate()
CRB_AR_INIT_AUTHENTICATE
Access-Request
Access-Accept 2s 2bauthenticate result
Access-Request3c 3s aaa_ebs_init_authorize()
CRB_AR_INIT_AUTHORIZE
Access-Request+VSAs return quota array
Accounting-Start5c
Accounting-Resp
Access-Request+VSAs7c 7s aaa_ebs_reauthorize()
Access-Accept+VSAs Updated quota
AAA server Billing server
4s 4b
6s
Data Flow
8s 8b
Repeat step 7-8 as neccesary
Accounting-Stop+VSAs9c 9s aaa_ebs_return_quota()
Generic Call Flow
This section describes the generic call flow for the Cisco AR 3.5 prepaid billing solution. The call flow
is controlled by the AAA client. The Cisco AR 3.5 server converts VSAs into calls to the billing server.
The packet flows presented in Figure 6-1 are specific to the Cisco AR 3.5 prepaid billing solution only.
The headlines in the packet flows are general and do represent all data transferred. The letters c, s, and
b in Figure 6-1 designate the packet’s source of client, server, or billing server, respectively.
Call Flow Details
This section provides details about the call flows and what each step achieves.
10s 10bAccounting-Resp Final status
75496
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Chapter 6 Prepaid Billing Solution
Note In the following attribute tables, entries beginning with APPL indicate application-specific attributes.
Another application might use the field for different purpose or ignore the field. All the fields with APPL
are specific to Mobile Wireless usage for illustration purpose.
Access-Request (Authentication)
Flow 1c shows the client sending the Access-Request to AAA server, part of a normal authentication
request. The exact nature of the message contents is dictated by the access technology, be it be
CDMA1X-RTT, GPRS, or another. The Access-Request might involve other messages such as
PAP/CHAP or another form of authentication.
The Flow 1c Access-Request might contain a prepaid specific VSA, CRB_AUTH_REASON. Table 6 -2
lists the attributes included in the authentication Access-Request. This tells the Cisco AR 3.5 server to
authenticate the subscriber with the Prepaid server as well. If the value is
CRB_AR_INIT_AUTHENTICATE, the initial quota must be obtained for a single service prepaid
solution. If this VSA is not present, the Cisco AR 3.5 server will not authenticate with the Prepaid billing
server.
Generic Call Flow
Table 6-2 Attributes Sent During Subscriber Authentication
Attribute
Number Attribute Name Description Notes
1 User-Name APPL: Mobile Node
Required
Username
2 NAS IP Address Accounting Node IP
APPL: Required, POA
Address
31 Calling-station-ID APPL:MSISDN or IMSI APPL: Conditional
26, 9 CRB_AUTH_REASON
Refer to VSA section Required
CRB_AR_INIT_AUTHENTICATE
26, 9 CRB_USER_ID APPL:PDSN address or
SSG address
APPL: Required,
Address of the PDSN
26, 9 CRB_SERVICE_ID APPL: Service ID such as
Simple IP service, Mobile
IP service, or VPN
service
26, 9 CRB_SESSION_ID This VSA contains the
session key ID
information
Required; the session
ID must be globally
unique across all clients
and across reboots of
the client
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In Flow 1s, the Cisco AR 3.5 server sends a call to the billing server to authenticate the prepaid user and
possibly determine more information about the subscriber’s account. The Cisco AR 3.5 server can be
configured to generate this packet flow, using a subscriber profile parameter, if the request is from a
prepaid subscriber.
Cisco Access Registrar 3.5 Concepts and Reference Guide
6-5
Generic Call Flow
Access-Accept (Authentication)
Flow 2b shows the billing server returning the authentication result. The billing server returns a failure
if the prepaid subscriber has an inadequate balance.
Flow 2s shows the Cisco AR 3.5 server sending the Access-Accept to the AAA client. This message flow
contains at least one prepaid billing-specific VSA (listed in Tabl e 6- 3) and may contain other access
technology-specific attributes.
Table 6-3 Attributes Sent to AAA client in Access-Accept (Authentication)
Attribute
Number Attribute Name Description Notes
26, 9 CRB__USER_TYPE
CRB_AR_INIT_AUTHENTICATE
Access-Request (Authorization)
In Flow 3c, the AAA client sends another Access-Request, this time to authorize the subscriber.
Table 6 - 4 lists the attributes required by the Cisco AR 3.5 server to authorize the subscriber. The session
key ID used must be specified using a prepaid VSA pointing to the RADIUS attribute (standard or VSA).
Chapter 6 Prepaid Billing Solution
Refer to Vendor-Specific
Attributes, page 6-10
Optional
Table 6-4 Attributes Sent During Subscriber Authorization
Attribute
Number Attribute Name Description Notes
1 User-Name APPL: Mobile Node
Username
2 NAS IP Address Accounting Node IP Address APPL: Required, POA
31 Calling-station-ID APPL:MSISDN or IMSI APPL: Conditional
26, 9 CRB_AUTH_REASON
CRB_AR_INIT_AUTHORIZE
26, 9 CRB_USER_ID APPL:PDSN address or SSG
26, 9 CRB_SERVICE_ID APPL: Service ID such as
26, 9 CRB_SESSION_ID This VSA contains the
.In Flow 3s, the Cisco AR 3.5 server sends the Prepaid billing server to obtain a quota. The quota might
contain several values depending on the number of measurement parameters chosen.
Refer to Vendor-Specific
Attributes, page 6-10
address
Simple IP service, Mobile IP
service, or VPN service
session key ID information
Required
Required
APPL: Required,
Address of the PDSN
Required; the session
ID must be globally
unique across all clients
and across reboots of
the client
Access-Accept (Authorization)
Flow 4b shows the billing server returning the quota array for the subscriber.
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Chapter 6 Prepaid Billing Solution
In Flow 4s, the Cisco AR 3.5 server converts the quota array received into VSAs and sends an
Access-Accept with the assembled VSAs to the AAA client. Tab le 6-5 lists the prepaid-specific VSAs
that might be included in the Access-Accept response message sent to the AAA client. For more detailed
information about the VSAs, refer to Vendor-Specific Attributes, page 6-10.
Table 6-5 Attributes Sent to AAA client in Access-Accept (Authorization)
Attribute
Number Attribute Name
26, 9 CRB_DURATION
26, 9 CRB_TOTAL_VOLUME
26, 9 CRB_UPLINK_VOLUME
26, 9 CRB_DOWNLINK_VOLUME
26, 9 CRB_TOTAL_PACKETS
26, 9 CRB_UPLINK_PACKETS
26, 9 CRB_DOWNLINK_PACKETS
Generic Call Flow
Accounting Start
Flows 3c through 4s are repeated for every service started or restarted by the AAA client.
However, if the return parameters indicate that the authorization is rejected, an Access-Accept message
is generated and sent to the client as shown in Table 6 - 6 . When this type of error condition occurs, no
other VSA is included in the Access-Accept message.
Table 6-6 Attribute Sent to Report Error Condition to AAA client
Attribute
Number Attribute Name Description Notes
26, 9 CRB_TERMINATE_CAUSE Identifies why a
subscriber failed
authentication:
1. Exceeded the balance
Conditional; rejection
might be returned with
Access-Accept and zero
(0) quota
2. Exceeded the overdraft
3. Bad credit
4. Services suspended
5. Invalid User
In Flow 5c, the AAA client sends the Accounting Start. In Flow 6s, the Cisco AR 3.5 server replies with
the Accounting-Response.
Data Flow
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At this point, the data transfer begins. The AAA client monitors the subscriber’s allocated quotas for
metering parameters. A subscriber’s Reauthorization request is generated when a quota for at least one
of the metering parameters, is depleted.
Cisco Access Registrar 3.5 Concepts and Reference Guide
6-7
Generic Call Flow
Access-Request (Quota Depleted)
Flow 7c shows the client sending an Access-Request to the Cisco AR 3.5 server because at least one
quota has been depleted. The Access-Request includes different measurements of how much of the
quotas were used in VSA format. This enables the billing server to account for the usage and manage
the subscriber’s balance before assigning a new quota. Table 6- 7 lists the attributes returned to the Cisco
AR 3.5 server:
Table 6-7 Attributes Sent by NAS When Quota Depleted
Attribute
Number Attribute Name Description Notes
1 User-Name APPL: Mobile Node
2 NAS IP Address Accounting Node IP
31 Calling-station-ID APPL:MSISDN or IMSI APPL: Conditional
26, 9 CRB_AUTH_REASON Refer to VSA Required
26, 9 CRB_USER_ID APPL: PDSN address or
26, 9 CRB_DURATION Refer to Vendor-Specific
26, 9 CRB_TOTAL_VOLUME Conditional
26, 9 CRB_UPLINK_VOLUME
26, 9 CRB_DOWNLINK_VOLUME
26, 9 CRB_TOTAL_PACKETS
26, 9 CRB_UPLINK_PACKETS
26, 9 CRB_DOWNLINK_PACKETS
Chapter 6 Prepaid Billing Solution
Conditional
Username
APPL: Required, POA
Address
SSG address
Attributes, page 6-10
address, or Home Node
address
APPL: Required,
address of SGSN
Required
Accept-Accept (Quota Depleted)
Flow 7s shows the Cisco AR 3.5 server returning the used quota array to the billing server. The call
includes aaa_ebs_reauthoriz(). The billing server sends an updated quota array for the next period to
the Cisco AR 3.5 server.
In Flow 8s, the Cisco AR 3.5 server converts the quota array into VSAs and sends them to the AAA
client.
Table 6-8 Attributes Sent to AAA Client in Access-Accept (Reauthorization)
Attribute
Number Attribute Name
26, 9 CRB_USER_TYPE
26, 9 CRB_DURATION
26, 9 CRB_TOTAL_VOLUME
26, 9 CRB_UPLINK_VOLUME
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Chapter 6 Prepaid Billing Solution
Table 6-8 Attributes Sent to AAA Client in Access-Accept (Reauthorization) (continued) (continued)
Attribute
Number Attribute Name
26, 9 CRB_DOWNLINK_VOLUME
26, 9 CRB_TOTAL_PACKETS
26, 9 CRB_UPLINK_PACKETS
26, 9 CRB_DOWNLINK_PACKETS
Accounting Stop (Session End)
In Flow 9c, the client sends an Accounting-Stop to the Cisco AR 3.5 server to end the session. The
Accounting-Stop message includes an updated quota array with the usage adjustments since the previous
authorization in the VSA form.
Table 6 - 9 lists the attributes included in the Accounting-Stop message set to the Cisco AR 3.5 server and
forwarded to the billing server.
Generic Call Flow
Accounting Response (Final Status)
In Flow 9s, the Cisco AR 3.5 server sends the used quota array to the billing server in an
Accounting-Stop message. Any values returned by the billing server in Flow 10b are discarded.
Flow 10s shows the Cisco AR 3.5 server sending final Accounting-Response message to the AAA client.
Table 6-9 Attributes Sent in Accounting-Stop Message
Attribute
Number Attribute Name Description Notes
1 User-Name APPL: Mobile Node Username Conditional
2 NAS IP Address Accounting Node IP Address APPL: Required, POA
31 Calling-station-ID APPL:MSISDN or IMSI APPL: Conditional
40, 2 Acct_status_type Indicates the accounting “Stop” for the
service
42 Acct-Input-Octets The number of octets sent by the
subscriber; uplink
43 Acc_Output_Octets The number of octets received by the
subscriber; downlink
46 Acct-Session-Time Duration of the session
47 Acct-Input-Packets Number of packets sent by the subscriber
48 Acct-Output-Packets Number of packets received by the
subscriber
49 Acct-Terminate-Cause This parameter, used for tracking, should
remain the same for all accounting
requests for a given service.
Required; this value (2) indicates
an Accounting-Stop request
message
Required
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6-9
Generic Call Flow
Table 6-9 Attributes Sent in Accounting-Stop Message (continued)
Attribute
Number Attribute Name Description Notes
26, 9 CRB_DURATION Refer to Vendor-Specific Attributes, page
26, 9 CRB_TOTAL_VOLUME
6-10
Conditional
26, 9 CRB_UPLINK_VOLUME
26, 9 CRB_DOWNLINK_VOLUME
26, 9 CRB_TOTAL_PACKETS
26, 9 CRB_UPLINK_PACKETS
26, 9 CRB_DOWNLINK_PACKETS
26, 9 CRB_SESSION_ID Specifies the RADIUS attribute carrying
Optional
the session ID information
Vendor-Specific Attributes
Chapter 6 Prepaid Billing Solution
Vendor-specific attributes are included in specific RADIUS packets to communicate prepaid user
balance information from the Cisco AR 3.5 server to the AAA client, and actual usage, either interim or
total, between the NAS and the Cisco AR 3.5 Server.
Table 6 - 1 0 lists the VSAs that will be defined in the API. Tab l e 6 -10 also lists the string to be used with
Cisco-AVPair below the VSA.
Note Notice that all VSAs start with CRB which stands for Cisco Radius Billing.
Table 6-10 Vendor-Specific Attributes for the Cisco Prepaid Billing Solution
Source
VSA Name Type
CRB_AUTH_REASON
Int8 1c, 7c, 7’c Passed with re-authorization:
crb-auth-reason
(Call Flow) Description
1. Quota depleted
2. QOS changed
3. Initial Authentication
4. Initial Authorization
CRB_USER_ID
crb-user-id
CRB_SERVICE_ID
crb-service-id
String 1c, 7c, 7’c APPL: In PDSN this can be
Address of the PDSN.
String 1c, 7c Identifies the subscriber’s
service
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Chapter 6 Prepaid Billing Solution
Table 6-10 Vendor-Specific Attributes for the Cisco Prepaid Billing Solution
VSA Name Type
CRB_USER_TYPE
crb-entity-type
CRB_DURATION
crb-duration
CRB_TOTAL_VOLUME
crb-total-volume
CRB_UPLINK_VOLUME
crb-uplink-volume
CRB_DOWNLINK_VOLUME
crb-downlink-volume
CRB_TOTAL_PACKETS
crb-total-packets
CRB_UPLINK_PACKETS
crb-uplink-packets
CRB_DOWNLINK_PACKETS
crb-downlink-packets
CRB_SESSION_ID
crb-session-id
Generic Call Flow
Source
(Call Flow) Description
Int8 4s Type of user:
1. Prepaid user
2. Post-paid with no credit limit
3. Post-paid with credit limit
4. Invalid user
The source for this VSA value
could be from the Subscriber
profile or from the billing server
Int32 4s, 8s Downlink quota received by the
AAA client
Total Volume quota received by
the AAA client
Uplink volume quota received by
the AAA client
Uplink Volume quota received
by the AAA client
Downlink Packet quota received
by the AAA client
Uplink Packet quota received by
the AAA client
Uplink Volume quota received
by the AAA client
String Additional field if session ID is
required. This VSA provides the
real time billing-specific session
ID. This VSA duplicates the
contents of the technologyspecific session ID or the
contents of RADIUS attributes
44 or 50. The NAS can use this
VSA to generate a unique
session ID. If this VSA is not
present, then RADIUS attribute
44 is used instead.
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If this is a string AV Pair-type
attribute, the name is the string
attribute name.
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6-11
Generic Call Flow
Chapter 6 Prepaid Billing Solution
Table 6-10 Vendor-Specific Attributes for the Cisco Prepaid Billing Solution
Source
VSA Name Type
CRB_TERMINATE_CAUSE
Int8 4se Identifies why a subscriber failed
crb-terminate-cause
CRB_PRIVATE
String n/a Reserved for future use
crb-private
(Call Flow) Description
authentication:
1. Exceeded the balance
2. Exceeded the overdraft
3. Bad credit
4. Services suspended
5. Invalid User
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A
GLOSSARY
Access point
Analog Channel
ARP
ATM
ATO
C
Call
CHAP
CLID
CM
A device that bridges the wireless link on one side to the wired network on the other.
A circuit-switched communication path intended to carry 3.1 KHz audio in each direction.
Address Resolution Protocol is the TCP/IP protocol that translates an Internet address into the
hardware address of a network interface card.
Asynchronous Transfer Mode is a virtual circuit, fast packet technology. Traffic of all kinds (data,
voice, video) is divided into 53-byte cells and conducted over very high speed media.
Adaptive Time Out is the time that must elapse before an acknowledgment is considered lost. After a
time out, the sliding window is partially closed and the ATO is backed off.
A connection or attempted connection between two terminal end points on a PSTN or ISDN; for
example, a telephone call between two modems.
Challenge Authentication Protocol is a PPP cryptographic challenge/response authentication protocol
in which the clear text password is not passed in the clear over the line.
Calling Line ID indicates to the receiver of a call, the phone number of the caller.
Cable Modem is usually a modem with an RF (cable) interface on one side and an Ethernet interface
on the other. A cable modem might also have a telephone interface for “telco return,” which is used
when only downstream capability exists in the cable plant.
CNR
Community String
Control Messages
CSG
CSR
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Cisco Network Registrar—A network management application which includes a DHCP server and a
DNS server.
A string used to authenticate the trap message sender (SNMP agent) to the trap recipient (SNMP
management station).
Control messages are exchanged between LAC, LNS pairs, and operate in-band within the tunnel
protocol. Control messages govern aspects of the tunnel and sessions within the tunnel.
Cable Systems Group is a billing systems company.
Customer Service Representative—the person you call to activate or obtain service for your account.
Cisco Access Registrar 3.5 Concepts and Reference Guide
GL-1
C
Glossary
CSU/DSU
Customer
D
DAP
Data Source
DHCP
DHCP Client
DHCP Proxy Client
Dial Use
Channel Service Unit/Data Service Unit isolates your network from your exchange carrier’s network.
It also receives the timing, low-level framing information, and data passed from the termination point.
CSU/DSUs are specific to the general circuit type.
A user of an ISP or an enterprise. The provider offers the customer MPLS VPN service. The enterprise
provides the customer remote user access to various sites. In the case of ISPs, MPLS BPN provides a
scalable wholesale access/open access solution.
Directory Access Protocol is a heavyweight protocol that runs over a full OSI stack and requires a
significant amount of computing resources to run.
Sets of data and their associated environments which include operating system, DBMS, and network
platforms used to access the DBMS that an application wants to access.
Dynamic Host Configuration Protocol—a protocol that describes the service of providing and
managing IP addresses to clients on a network.
The IOS DHCP client used to generate requests for host addresses and subnets for non-PPP clients.
The IOS DHCP client used to request an address for a PPP user from a DHCP server.
Dial Use is an end-system or router attached to an on-demand PSTN or ISDN, which is either the
initiator or recipient of a call.
Digital Channel
DNIS
Driver Manager
E
EAP
Digital Channel is a circuit-switched communication path that is intended to carry digital information
in each direction.
Dialed Number Information String is an indication to the receiver of a call as to what phone number
the caller used to reach it.
A special library that manages communication between applications and drivers. Applications call
ODBC API functions in the driver managers which load and call one or more drivers on behalf of the
applications.
Extensible Authentication Protocol is a framework for a family of PPP authentication protocols,
including cleartext, challenge/response, and arbitrary dialog sequences.
GL-2
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Glossary
F
FT
Frame Relay
I
ISDN
ISP
H
HDLC
L
L2TP Access
Concentrator (LAC)
Field Technician is someone who installs your cable modem in your house.
Frame Relay is a cost-effective, lightweight, many-to-many, medium-speed, virtual network, link-layer
technology.
Integrated Services Digital Network enables synchronous PPP access.
Internet Service Provider is a company that provides Internet connectivity.
High-level Data Link Control is both a point-to-point and multiparty link-layer technology. HDLC
provides reliable, acknowledged transfer across dedicated links.
LAC is a device attached to one or more PSTN or ISDN lines capable of PPP operation and of handling
the L2TP protocol. The LAC needs only to implement the media over which L2TP is to operate to pass
traffic to one or more LNSs. It may tunnel any protocol carried within PPP.
LAN
LDAP
LEAP
LLC
L2TP Network
Server (LNS)
Local Area Network consists of all of the components that create a system up to a router. These
components include cables, repeaters, bridges, and software up to the network layer.
Lightweight Directory Access Protocol provides a standard way for Internet clients, applications, and
WWW servers to access directory information across the Internet such as user names, e-mail addresses,
security certificates, and other contact information.
Light Extensible Authentication Protocol—
Logical Link Control is an interface that defines several common interfaces between higher-level
protocols (for example, IP) and the networks they ride upon (for example, Ethernet, Token Ring, and
others).
An LNS operates on any platform capable of PPP termination. The LNS handles the server side of the
L2TP protocol. Since L2TP relies only on the single media over which L2TP tunnels arrive, the LNS
may have only a single LAN or WAN interface, yet still be able to terminate calls arriving at any LAC's
full range of PPP interfaces (async, synchronous ISDN, V.120, etc.).
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M
Glossary
MIB
MPLS
MPLS VPN
MSO
N
NAS
NCP
Management Information Base—Database of network management information used and maintained
by a network management protocol such as SNMP. The value of a MIB object can be changed or
retrieved using SNMP commands. MIB objects are organized in a tree structure that includes public
and private branches.
Multi-Protocol Label Switching—
MPLS-based Virtual Private Networks
Multiple System Operators are typically cable companies that provide Internet access for regional
independent operators.
Network Access Server is a device providing temporary, on-demand network access to users. This
access is point-to-point using PSTN or ISDN lines. A NAS operates as a client of RADIUS. The client
is responsible for passing user information to designated RADIUS servers.
In PPTP terminology, this is referred to as the PPTP Access Concentrator (PAC). In L2TP terminology,
the NAS is referred to as the L2TP Access Concentrator (LAC).
Network Control Protocol is responsible for negotiating the protocol-specific particulars of the
point-to-point protocol (PPP) link.
Network Access
Identifier
O
ODBC
ODBC Driver
In order to provide for the routing of RADIUS authentication and accounting requests, the UserID field
used in PPP and in the subsequent RADIUS authentication and accounting requests, known as the
Network Access Identifier (NAI), may contain structure. This structure provides a means by which the
RADIUS proxy locates the RADIUS server that is to receive the request. This same structure may also
be used to locate the tunnel end point when domain-based tunneling is used.
Open Database Connectivity—a standard set of application programming interface (API) function calls
(supported by Microsoft and in general use) that can be used to access data store in both relational and
non-relational database management systems (DBMSs).
Processes ODBC function calls, submits SQL requests to specific data source, and returns results to
applications. ODBC drivers for specific types of data files, including database files, spreadsheet files,
and text fields, are available from Microsoft Corporation.
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P
Glossary
packet
PAP
Payload
PDU
PE Router
POP
PPD
PPP
Profile
Provider
A block of data in a standard format for transmission.
Password Authentication Protocol is a simple PPP authentication mechanism in which a cleartext
username and password are transmitted to prove identity.
The contents of a request packet.
Protocol Data Unit—An SNMP compliant request, response, or trap message.
Provider Edge router—a router located at the edge of the provider’s MPLS core network.
Point of Presence is the dial-in point or connection point for users connecting to an ISP.
Packet Processing Delay is the amount of time required for each peer to process the maximum amount
of data buffered in their offered receive packet window. The PPD is the value exchanged between the
LAC and LNS when a call is established. For the LNS, this number should be small. For an LAC
supporting modem connections, this number could be significant.
Point-to-Point Protocol—a multiprotocol and includes UDP, Frame Relay PVC, and X.25 VC.
A collection of one or more attributes that describe how a user should be configured; for example, a
profile may contain an attribute whose value specifies the type of connection service to provide the
user, such as PPP, SLIP, or Telnet. Profiles can be set up for a specific user or can be shared amongst
users.
Service Provider—A provider who operates the access networks and MPLS backbone and provides
MPLS VPN service on the backbone.
PSTN
Q
Quality of Service
(QOS)
R
RAC Client
RADIUS
RADIUS Client
Public Switched Telephone Network enables async PPP through modems.
A given Quality of Service level is sometimes required for a given user being tunneled between an
LNS-LAC pair. For this scenario, a unique L2TP tunnel is created (generally on top of a new SVC) and
encapsulated directly on top of the media providing the indicated QOS.
The IOS DHCP client used to generate requests for host addresses and subnets for non-PPP clients.
Remote Authentication Dial-In User Service. The RADIUS protocol provides a method that allows
multiple dial-in Network Access Server (NAS) devices to share a common authentication database.
A Network Access Server (NAS) operates as a client of RADIUS. The client is responsible for passing
user information to designated RADIUS servers, and then acting on the response that is returned. A
RADIUS server can act as a proxy client to other RADIUS servers.
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R
Glossary
RADIUS Dictionary
RADIUS Proxy
RADIUS Server
RAS
Remote DHCP
Server
Remote Server
REX
Roaming
The RADIUS dictionary passes information between a script and the RADIUS server, or between
scripts running on a single packet.
In order to provide for the routing of RADIUS authentication and accounting requests, a RADIUS
proxy may be employed. To the NAS, the RADIUS proxy appears to act as a RADIUS server, whereas
to the RADIUS server the proxy appears to act as a RADIUS client.
A server that is responsible for receiving user connection requests, authenticating the user, and then
returning all of the configuration information necessary for the client to deliver the service to the user.
Remote Access Services. See RADIUS Client.
Usually a DHCP server in the service provider’s networks, however it might also be a DHCP server in
the customer’s VPN.
A server that has been registered with the user interface, which can later be referenced as a proxy client
or as the method to perform a service; for example, a remote RADIUS server can be specified to act as
a proxy client.
RADIUS EXtension allows you to write C and C++ programs to affect the behavior of Cisco Access
Registrar.
The ability to connect to a NAS that is not your normal POP (Point of Presence) and have the
Access-Request redirected to your normal RADIUS server. The ability to use any one of multiple
Internet server providers, while maintaining a formal, customer-vendor relationship with only one.
Router
Routing Tables
RTT
S
SAP
Script
A network device that connects multiple network segments and forwards packets from one network to
another. The router must determine how to forward a packet based on addresses, network traffic, and
cost.
A table that lists all of the possible paths data can take to get from a source to a destination. Depending
on how routers are configured, they may build their tables dynamically by trading information with
other routers, or they may be statically configured in advance.
Round-Trip Time is the estimated round-trip time for an Acknowledgment to be received for a given
transmitted packet. When the network link is a local network, this delay will be minimal (if not zero).
When the network link is the Internet, this delay could be substantial and vary widely. RTT is adaptive;
it adjusts to include the PPD (Packet Processing Delay) and whatever shifting network delays
contribute to the time between a packet being transmitted and receiving its acknowledgment.
Service Access Points (source and destination) identify protocols from which a packet has come and
to which a packet must be delivered.
Instructions that are run in the context of a RADIUS client/server session. Scripts can be specified for
servers, clients, vendors, and services. A script can be used as an incoming script, an outgoing script,
or both. Incoming scripts are executed during the Access-Request portion of a dial-in session. Outgoing
scripts are executed during the Access-Accept portion of a dial-in session. Scripts are referenced within
the User Interface by name. Scripts can be source code for a scripting language or a binary file.
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S
Glossary
Service
Services
Session
SHA-1
Shared Secret
Shared Use
Network
Silently Discard
A means of specifying the method to use to perform a function. A service can be specified for the
following functions: authentication, authorization, accounting, and authentication-authorization. For
example, a service can specify that authentication be performed using the local database, or a service
can specify that accounting be supported by logging information to a file.
Three default services are referenced by the server configuration and when processing scripts. They are
Default Authentication Service, Default Authorization Service, and Default Accounting Service. Each
service has a type and (if it is using remote servers) an ordered list of servers to use.
Each service provided by the NAS to a dial-in user constitutes a session, with the beginning of the
session defined as the point where service is first provided and the end of the session defined as the
point where service is ended. Depending on NAS support capabilities, a user may have multiple
sessions in parallel or in series.
Secure Hash Algorithm; a hashing algorithm that produces a 160-bit digest based upon the input. The
algorithm produces SHA passwords that are irreversible or prohibitively expensive to reverse.
Used to authenticate transactions between the client and the RADIUS server. The shared secret is never
sent over the network.
An IP dial-up network whose use is shared by two or more organizations. Shared use networks typically
implement distributed authentication and accounting in order to facilitate the relationship amongst the
sharing parties.
RADIUS discards the packet without further processing. The server logs an error, including the
contents of the silently discarded packet, and records the event in a statistics counter.
SLIP
SMDS
SSHA
SNAP
SSL
SVC
Serial Line Internet Protocol is TCP/IP over direct connections and modems, which allows one
computer to connect to another or to a whole network.
Switched Multi-megabit Data Service is a high-speed Metropolitan-Area Networking technology that
behaves like a LAN.
Netscape’s (iPlanet) enhancement of the SHA-1 algorithm which includes salted password data.
SubNetwork Access Protocol is used when a SAP definition does not exist for the encapsulated user
data protocol.
Secure Socket Layer is the protocol defined by Netscape that is used for encryption and authentication
between two Internet entities. It uses public/private key certificates instead of shared secrets.
Switched Virtual Circuit is an L2TP-compatible media on top of which L2TP is directly encapsulated.
SVCs are dynamically created, permitting tunnel media to be created dynamically in response to
desired LNS-LAC connectivity requirements.
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GL-7
T
Glossary
TACACS
Telnet
Trap
Tunnel
Tunnel Network
Server
U
UDP
User List
Terminal Access Controller Access Control System, a an authentication server that validates user IDs
and passwords, thus controlling entry into systems.
A service that lets you log in to a system over a network just as though you were logging in from a
remote character terminal attached to the system. It is commonly used to provide an Internet service
that is exactly the same as the one you would get if you dialed into the system directly with a modem.
A network message of a specific format issued by an SNMP entity on behalf of a network management
agent application. A trap is used to provide the management station with an asynchronous notification
of an event.
A tunnel is defined by an LNS-LAC pair. The tunnel carries PPP datagrams between the LAC and the
LNS; many sessions can be multiplexed over a single tunnel. A control connection operating in band
over the same tunnel controls the establishment, release, and maintenance of sessions and of the tunnel
itself.
A server that terminates a tunnel. In PPTP terminology, this is known as the PPTP Network Server
(PNS). In L2TP terminology, this is known as the L2TP Network Server (LNS).
User Datagram Protocol, a data packet protocol.
The list of users registered for dial-in access.
User Record
Users
V
Vendor
VHG
The UserRecord contains all the information that needs to be accessed at runtime about a particular
user. This enables it to be read in one database operation in order to minimize the cost of authenticating
the user. The UserRecord is stored as an encrypted string in the MCD database, because it contains the
user’s password, amongst other things.
Users are represented by entities in specific UserLists. See User Record.
Each NAS has a vendor associated with it. A vendor may specify attributes for the NAS that are not
part of the standard specification.
Virtual Home Gateway—a Cisco IOS component that terminates PPP sessions. It is owned and
managed by the service provider on behalf of its customer to provide access to remote users of that
customer’s network. a single service provider device (router) may host multiple VHGs of different
customers. a VHG may be dynamically brought up and down based on the access pattern of the remote
users. Note that there is no single IOS feature called the VHG; it is a collection of function and features
(PPP, virtual profiles, VRFs, etc.).
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V
Glossary
VPN
VRF
X
X.25
X.500
Virtual Private Network is a way for companies to use the Internet to securely transport private data.
Virtual routing and forwarding. A per VPM routing table on the PE router. Each VPN instantiated on
that PE router has its own VRF.
A reliable public data network technology consisting of private virtual circuits, virtual calling, and
per-packet charging.
Defines the Directory Access Protocol (DAP) for clients to use when contacting directory servers. DAP
is a heavyweight protocol that runs over a full OSI stack and requires a significant amount of computing
resources to run.
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INDEX
A
AAA Servers
multiple 2-9
Access Registrar
definition 1-1
objects 2-1
Access-Accept 2-7
Access-Challenge 1-2
Accounting
attributes 1-4
database 1-1
definition 1-1
AltigaOutgoingScript 3-2
ANAAAOutgoing 3-2
AscendIncomingScript 3-2
AscendOutgoingScript 3-2
Attribute Dictionary 1-4
Authentication 1-5
Authentication-Service 2-6
Authorization 1-5
definition 1-1
Authorization-Service 2-6
C
CabletronOutgoing 3-3
Callback-Number 1-4
CiscoIncoming 3-3
CiscoOutgoing 3-3
CiscoWithODAPIncomingScript 3-3
Client/server model 1-1
D
DefaultAuthenticationService 2-3
Dictionary
attribute 1-4
request 1-5
E
Environment Dictionary 2-3, 2-6
F
Framed Protocol 1-4
Framed-IP-Address 1-4
G
Group-Session-Limit Resource Manager 2-3
H
Hot configuration 4-5
I
Incoming scripts 1-2, 2-2
IncomingScript 2-5
Input queue
high threshold 5-3
IP-Dynamic Resource Manager 2-3
IP-Per-NAS-Port Resource Manager 2-3
IPX-Dynamic Resource Manager 2-3
L
LDAP server 1-4
Limits
group session 2-9
M
MapSourceIPAddress 3-5
Measurements
prepaid billing 6-1
N
NAS 1-1
NAS-IP-Address 1-4
NAS-Port 1-4
O
Outgoing scripts 1-2, 2-2, 2-7
P
Packet fields 1-3
PPP 1-4, 2-2
Prepaid billing ix, 6-1
components ix, 6-1
measurements 6-1
Proxy server 1-4
Proxying 1-4
R
RADIUS
messages 1-3
program flow 1-2
protocol 1-1
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Index
RadiusServer object 2-1
RepIPMaster 4-7
Replication ix, 4-1
archive 4-3
automatic resynchronization 4-4
configuration settings 4-5
data flow 4-2
data integrity 4-3
hot configuration 4-5
hot-standby 4-1
impact on request processing 4-5
RepIPAddress 4-7
RepTransactionArchiveLimit 4-2, 4-6
RepTransactionSyncInterval 4-2, 4-6
security 4-3
slave server 4-2
slaves 4-8
transaction order 4-4
transaction verification 4-4
RepMasterIPAddress 4-7
RepMasterPort 4-7
RepPort 4-7
RepSecret 4-7
RepType 4-6
Request Dictionary 1-2
Resource allocation
dynamic 2-3
Resource management 1-6, 2-9
Resource Managers 2-3
Response Dictionary 1-3
Resynchronization
automatic 4-4
full 4-5
RFC
2865 1-5
RFC 2865 1-4
RFC 2866 1-4
RFC 2867 1-4
RFC 2868 1-4
S
Scripts 1-5, 3-1
ACMEOutgoingScript 3-1
AltigaIncomingScript 3-1
ANAAAOutgoing 3-2
AuthorizePPP 3-2
AuthorizeService 3-2
AuthorizeSLIP 3-2
AuthorizeTelnet 3-3
ExecCLIDRule 3-3
ExecDNISRule 3-4
ExecFilterRule 3-4
ExecRealmRule 3-4
ParseAAARealm 3-5
ParseAARealm 3-5
ParseAASRealm 3-5
ParseProxyHints 3-6
ParseServiceAndAAARealmHints 3-6
ParseServiceAndAAASRealmHints 3-6
ParseServiceAndAARealmHints 3-6
ParseServiceAndAASRealmHints 3-6
ParseServiceAndProxyHints 3-6
ParseServiceHints 3-7
ParseTranslationGroupsByCLID 3-7
ParseTranslationGroupsByDNIS 3-7
ParseTranslationGroupsByRealm 3-7
tParseAASRealm 3-5
tParseProxyHints 3-6
tParseServiceAndAAARealmHints 3-6
tParseServiceAndProxyHints 3-6
tParseServiceHints 3-7
types of 2-2
UseCLIDAsSessionKey 3-7
USROutgoingScript 3-8
Server
central resource 2-9, 2-11
master 4-1
network access 1-5
primary 4-1
proxy 1-4
secondary 4-1
Service
Radius-Session 2-10
Session-Service 2-10
Services
used for 2-2
Session Management
Cross-server 2-9
definition 1-1
types of 2-3
Shared secret
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definition 1-2
SLIP 1-4
SNMP ix, 5-1
configuration files 5-5, 5-6
traps 5-2
SNMP Configuration
community string 5-7
snmp.conf file 5-6
snmpd.conf file 5-6
T
Tcl scripts 3-1
tMapSourceIPAddress 3-5
tParseAARealm 3-5
tParseServiceAndAAASRealmHints 3-6
tParseServiceAndAARealmHints 3-6
tParseServiceAndAASRealmHints 3-6
Trap configuration
directories searched 5-5
Traps
carAccountingLoggingFailure 5-5
carInputQueueFull 5-3
carInputQueueNotVeryFull 5-3
carOtherAccServerResponding 5-5
carOtherAuthServeNotrResponding 5-4
carOtherAuthServerResponding 5-4
carServerStart 5-3
carServerStop 5-3
configuring 5-5
supported 5-3
U
UNIX directories 2-1
User extensions. See Scripts.
User objects 2-2
User profiles 2-2
UserList 2-2
User-session-limit Resource Manager 2-3
USRIncomingScript 3-7
USRIncomingscript-ignoreAccountingSignature
3-7
USR-VPN Resource Manager 2-3
W
Windows 95 Registry 2-1
Index
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Index
IN-4
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