TACACS+ Configuration Guide Cisco IOS XE Release 3S
Per VRF for TACACS+ Servers
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Per VRF for TACACS+ Servers

Table Of Contents

Per VRF for TACACS+ Servers

Finding Feature Information

Contents

Prerequisites for Per VRF for TACACS+ Servers

Restrictions for Per VRF for TACACS+ Servers

Information About Per VRF for TACACS+ Servers

Per VRF for TACACS+ Servers Overview

How to Configure Per VRF for TACACS+ Servers

Configuring Per VRF on a TACACS+ Server

Verifying Per VRF for TACACS+ Servers

Configuration Examples for Per VRF for TACACS+ Servers

Configuring Per VRF for TACACS+ Servers: Example

Additional References

Related Documents

Standards

MIBs

RFCs

Technical Assistance

Feature Information for Per VRF for TACACS+ Servers


Per VRF for TACACS+ Servers


First Published: March 1, 2004
Last Updated: July 31, 2009

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

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 XE software image support. To access Cisco Feature Navigator, go to http://tools.cisco.com/ITDIT/CFN/jsp/index.jsp. 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 enabled globally on the router 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 XE Release 2.2, 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.



Caution Enabling debug CLI can cause performance degradation on the router. Use of debug commands for large number of sessions is not recommended.

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+" chapter of the "Security Server Protocols" section of the Cisco IOS XE Security Configuration Guide: Securing User Services, Release 2

Per VRF AAA

Per VRF AAA

Cisco IOS XE commands

Cisco IOS Master Command List, All Releases

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 XE software 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/techsupport


Feature Information for Per VRF for TACACS+ Servers

Table 1 lists the release history for this feature.

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


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

Cisco IOS XE Release 2.2

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.

In Cisco IOS XE Release 2.2, this feature was introduced on the Cisco ASR 1000 Series Aggregation Services Routers.

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