Cisco IOS Security Configuration Guide: Securing User Services, Release 12.4

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Book Title

Cisco IOS Security Configuration Guide: Securing User Services, Release 12.4

Chapter Title

Per VRF for TACACS+ Servers

Results

Updated:
March 26, 2008

Chapter: Per VRF for TACACS+ Servers


Per VRF for TACACS+ Servers

First Published: March 1, 2004
Last Updated: June 29, 2010

The Per VRF for TACACS+ Servers feature allows per virtual route forwarding (per VRF) to be configured for authentication, authorization, and accounting (AAA) on TACACS+ servers.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the "Feature Information for Per VRF for TACACS+ Servers" section.

Use Cisco Feature Navigator to find information about platform support and Cisco IOS and Catalyst OS software image support. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Contents

•Prerequisites for Per VRF for TACACS+ Servers

•Restrictions for Per VRF for TACACS+ Servers

•Information About Per VRF for TACACS+ Servers

•How to Configure Per VRF for TACACS+ Servers

•Configuration Examples for Per VRF for TACACS+ Servers

•Additional References

Prerequisites for Per VRF for TACACS+ Servers

•TACACS+ server access is required.

•Experience configuring TACACS+, AAA and per VRF AAA, and group servers is necessary.

Restrictions for Per VRF for TACACS+ Servers

•The VRF instance must be specified before per VRF for a TACACS+ server is configured.

Information About Per VRF for TACACS+ Servers

To configure the Per VRF for TACACS+ Servers feature, the following concept should be understood:

•Per VRF for TACACS+ Servers Overview

Per VRF for TACACS+ Servers Overview

The Per VRF for TACACS+ Servers feature allows per VRF AAA to be configured on TACACS+ servers. Prior to Cisco IOS Release 12.3(7)T, this functionality was available only on RADIUS servers.

How to Configure Per VRF for TACACS+ Servers

This section contains the following procedures:

•Configuring Per VRF on a TACACS+ Server (required)

•Verifying Per VRF for TACACS+ Servers (optional)

Configuring Per VRF on a TACACS+ Server

The initial steps in this procedure are used to configure AAA and a server group, create a VRF routing table, and configure an interface. Steps 10 through 13 are used to configure the per VRF on a TACACS+ server feature:

SUMMARY STEPS

1. enable

2. configure terminal

3. ip vrf vrf-name

4. rd route-distinguisher

5. exit

6. interface interface-name

7. ip vrf forwarding vrf-name

8. ip address ip-address mask [secondary]

9. exit

10. aaa group server tacacs+ group-name

11. server-private {ip-address | name} [nat] [single-connection] [port port-number] [timeout seconds] [key [0 | 7] string]

12. ip vrf forwarding vrf-name

13. ip tacacs source-interface subinterface-name

14. exit

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

configure terminal

Example:

Router# configure terminal

Enters global configuration mode.

Step 3 

ip vrf vrf-name

Example:

Router (config)# ip vrf cisco

Configures a VRF table and enters VRF configuration mode.

Step 4 

rd route-distinguisher

Example:

Router (config-vrf)# rd 100:1

Creates routing and forwarding tables for a VRF instance.

Step 5 

exit

Example:

Router (config-vrf)# exit

Exits VRF configuration mode.

Step 6 

interface interface-name

Example:

Router (config)# interface Loopback0

Configures an interface and enters interface configuration mode.

Step 7 

ip vrf forwarding vrf-name

Example:

Router (config-if)# ip vrf forwarding cisco

Configures a VRF for the interface.

Step 8 

ip address ip-address mask [secondary]

Example:

Router (config-if)# ip address 10.0.0.2 255.0.0.0

Sets a primary or secondary IP address for an interface.

Step 9 

exit

Example:

Router (config-if)# exit

Exits interface configuration mode.

Step 10 

aaa group server tacacs+ group-name

Example:

Router (config)# aaa group server tacacs+ tacacs1

Groups different TACACS+ server hosts into distinct lists and distinct methods and enters server-group configuration mode.

Step 11 

server-private {ip-address | name} [nat] [single-connection] [port port-number] [timeout seconds] [key [0 | 7] string]

Example:

Router (config-sg-tacacs+)# server-private 10.1.1.1 port 19 key cisco

Configures the IP address of the private TACACS+ server for the group server.

Step 12 

ip vrf forwarding vrf-name

Example:

Router (config-sg-tacacs+)# ip vrf forwarding cisco

Configures the VRF reference of a AAA TACACS+ server group.

Step 13 

ip tacacs source-interface subinterface-name

Example:

Router (config-sg-tacacs+)# ip tacacs source-interface Loopback0

Uses the IP address of a specified interface for all outgoing TACACS+ packets.

Step 14 

exit

Example:

Router (config-sg-tacacs)# exit

Exits server-group configuration mode.

Verifying Per VRF for TACACS+ Servers

To verify the per VRF TACACS+ configuration, perform the following steps:

Note The debug commands may be used in any order.

SUMMARY STEPS

1. enable

2. debug tacacs authentication

3. debug tacacs authorization

4. debug tacacs accounting

5. debug tacacs packets

DETAILED STEPS

 
Command or Action
Purpose

Step 1 

enable

Example:

Router> enable

Enables privileged EXEC mode.

•Enter your password if prompted.

Step 2 

debug tacacs authentication

Example:

Router# debug tacacs authentication

Displays information about AAA/TACACS+ authentication.

Step 3 

debug tacacs authorization

Example:

Router# debug tacacs authorization

Displays information about AAA/TACACS+ authorization.

Step 4 

debug tacacs accounting

Example:

Router# debug tacacs accounting

Displays information about accountable events as they occur.

Step 5 

debug tacacs packets

Example:

Router# debug tacacs packets

Displays information about TACACS+ packets.

Configuration Examples for Per VRF for TACACS+ Servers

This section includes the following configuration example:

•Configuring Per VRF for TACACS+ Servers: Example

Configuring Per VRF for TACACS+ Servers: Example

The following output example shows that the group server tacacs1 is configured for per VRF AAA services: 

aaa group server tacacs+ tacacs1

    server-private 10.1.1.1 port 19 key cisco

    ip vrf forwarding cisco

    ip tacacs source-interface Loopback0


  ip vrf cisco

   rd 100:1


  interface Loopback0

   ip address 10.0.0.2 255.0.0.0

   ip vrf forwarding cisco

Additional References

The following sections provide references related to Per VRF for TACACS+ Servers..

Related Documents

Related Topic
Document Title

Configuring TACACS+

"Configuring TACACS+" module.

Per VRF AAA

"Per VRF AAA" module.

Security commands

Cisco IOS Security Command Reference


Standards

Standard
Title

No new or modified standards are supported by this feature, and support for existing standards has not been modified by this feature.

—


MIBs

MIB
MIBs Link

No new or modified MIBs are supported by this feature, and support for existing MIBs has not been modified by this feature.

To locate and download MIBs for selected platforms, Cisco IOS releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs


RFCs

RFC
Title

No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.

—


Technical Assistance

Description
Link

The Cisco Support website provides extensive online resources, including documentation and tools for troubleshooting and resolving technical issues with Cisco products and technologies.

To receive security and technical information about your products, you can subscribe to various services, such as the Product Alert Tool (accessed from Field Notices), the Cisco Technical Services Newsletter, and Really Simple Syndication (RSS) Feeds.

Access to most tools on the Cisco Support website requires a Cisco.com user ID and password.

http://www.cisco.com/cisco/web/support/index.html


Feature Information for Per VRF for TACACS+ Servers

Table 1 lists the release history for this feature.

Not all commands may be available in your Cisco IOS software release. For release information about a specific command, see the command reference documentation.

Use Cisco Feature Navigator to find information about platform support and software image support. Cisco Feature Navigator enables you to determine which Cisco IOS and Catalyst OS software images support a specific software release, feature set, or platform. To access Cisco Feature Navigator, go to http://www.cisco.com/go/cfn. An account on Cisco.com is not required.

Note Table 1 lists only the Cisco IOS software release that introduced support for a given feature in a given Cisco IOS software release train. Unless noted otherwise, subsequent releases of that Cisco IOS software release train also support that feature.

Table 1 Feature Information for Per VRF for TACACS+ Servers 

Feature Name
Releases
Feature Information

Per VRF for TACACS+ Servers

12.3(7)T
12.2(33)SRA1
12.2(33)SXI
12.2(33)SXH4
12.2(54)SG

The Per VRF for TACACS+ Servers feature allows per virtual route forwarding (per VRF) to be configured for authentication, authorization, and accounting (AAA) on TACACS+ servers.

This feature was introduced in Cisco IOS Release 12.3(7)T.

This feature was integrated into Cisco IOS Release 12.2(33)SRA1.

This feature was integrated into Cisco IOS Release 12.2(33)SXI.

This feature was integrated into Cisco IOS Release 12.2(33)SXH4.

The following commands were introduced or modified: ip tacacs source-interface, ip vrf forwarding (server-group), server-private (TACACS+).


Cisco and the Cisco Logo are trademarks of Cisco Systems, Inc. and/or its affiliates in the U.S. and other countries. A listing of Cisco's trademarks can be found at www.cisco.com/go/trademarks. Third party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1005R)

Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental.

© 2004-2009 Cisco Systems, Inc. All rights reserved.

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