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CCSP Self-Study: Advanced AAA Security for Cisco Router Networks

  • Sample Chapter is provided courtesy of Cisco Press.
  • Date: May 21, 2004.

Chapter Description

For CCSP candidates, John Roland discusses Cisco Secure ACS 3.0 for Windows 2000/NT Servers, Cisco Secure ACS for UNIX, and the security services of TACACS+, RADIUS, and Kerberos.

Case Study

Continuing with the case study for The Future Corporation, the system administrator now needs to continue the configuration of the DallasR1 router shown in Figure 3-14.


Complete the following configuration tasks on the DallasR1 router:

  1. Identify the TACACS+ server whose IP address is using a preshared key of future123key.

  2. To make it easier to track logging events and to make debug output more useable, set up the router to time-stamp logging and debug entries using local time. Record debug times to the millisecond.

  3. Set up accounting to record all start and stop times for EXEC processes and network processes on the ACS server.

Figure 14Figure 3-14 The Future Corporation


The following commands will accomplish the required configuration:

  1. Identify the TACACS+ server whose IP address is using a preshared key of future123key:

  2. DallasR1(config)# tacacs-server host
    DallasR1(config)# tacacs-server key future123key
  3. To make it easier to track logging events and to make debug output more useable, set up the router to time-stamp logging and debug entries using local time. Record debug times to the millisecond.

  4. DallasR1(config)# service timestamps debug datetime localtime msec
    DallasR1(config)# service timestamps log datetime localtime
  5. Set up accounting to record all start and stop times for EXEC processes and network processes on the ACS server:

  6. DallasR1(config)# aaa accounting exec start-stop tacacs+
    DallasR1(config)# aaa accounting network start-stop tacacs+

    Once these commands have been entered, the configuration for router DallasR1 (excluding interface entries) looks like Example 3-5.

Example 3-5 DallasR1 Final Configuration

version 12.2
service timestamps debug datetime localtime msec
service timestamps log datetime localtime
service password-encryption
hostname DallasR1
aaa new-model
aaa authentication login default group tacacs+ local
aaa authentication login console-in group tacacs+ enable
aaa accounting exec start-stop tacacs+
aaa accounting network start-stop tacacs+
enable secret 5 $1$ES4r$tA1rlg0beW/Kvk6jGIj2f.
enable secret level 2 5 $1$mCGe$.1fTlJ.fcR8NHqa0AMR2F/
enable password 7 09611E1C171113171C
username aaadmin password 7 1531035C147F3F752B38
access-list 88 permit
access-list 88 permit
access-list 88 permit
access-list 88 permit
access-list 88 permit
access-list 88 permit
snmp-server community ROSNMP ro
snmp-server community RWSNMP rw 88
tacacs-server host
tacacs-server key future123key
privilege exec level 2 ping
banner motd #
WARNING: You are connected to $(hostname) on The Future Corporation network. Unauthorized access and use of this network will be vigorously prosecuted. #
line con 0
 login authentication console-in
 exec-timeout 4 20
line aux 0
 password 7 112A115507471F5D0721
 exec-timeout 4 20
line vty 0 4
 password 7 05280E5F31195A581A0E

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