AAA services

AAA stands for authentication Authorization and Accounting. We all know the importance of AAA services in any network. There are numbers of ways to implement AAA services. The most commonly used are

  • Tacacs+
  • Radius
Terminal Access Control Access Control Server Remote Authentication Dial-In User services.
Cisco proprietary protocolopen standard protocol
It uses TCP as transmission protocolIt uses UDP as transmission protocol
It uses TCP port number 49.It uses UDP port number 1812 for authentication and authorization and 1813 for accounting.
Authentication, Authorization and Accounting is separated in TACACS+.Authentication and Authorization is combined in RADIUS.
All the AAA packets are encrypted.Only the password are encrypted while the other information such as username, accounting information etc are not encrypted.
preferably used for ACS.used when ISE is used
It provides more granular control i.e can specify the particular command for authorization.No external authorization of commands supported.
TACACS+ offers multiprotocol supportNo multiprotocol support.
Used for device administration.used for network access

The lab below will show the implementation of Tacacs+ server and Radius Server as well.

R1#sh run
 Building configuration…
 Current configuration : 3799 bytes
 ! Last configuration change at 03:18:41 UTC Fri Dec 27 2019
 version 15.6
 service timestamps debug datetime msec
 service timestamps log datetime msec
 no service password-encryption
 hostname R1
 enable secret 5 cisco123
 aaa new-model
 aaa group server tacacs+ tacacs-servers
  server name tacacs-server1
 aaa group server radius radius-servers
  server name radius-server1
 aaa authentication login default group radius-servers local
  aaa authentication login default group tacacs-servers local 
 aaa session-id common
 ethernet lmi ce
 mmi polling-interval 60
 no mmi auto-configure
 no mmi pvc
 mmi snmp-timeout 180
 no ip icmp rate-limit unreachable
 no ip domain lookup
 ip domain name
 ip cef
 no ipv6 cef
 multilink bundle-name authenticated
 username cisco privilege 15 password 0 cisco123
 interface GigabitEthernet0/0
  description tacacs-servers
  ip address
  duplex auto
  speed auto
  media-type rj45
 interface GigabitEthernet0/1
  description radius-servers
  ip address
  duplex auto
  speed auto
  media-type rj45
 interface GigabitEthernet0/2
  description host
  ip address
  duplex auto
  speed auto
  media-type rj45
 ip forward-protocol nd
 no ip http server
 no ip http secure-server
 tacacs server tacacs-server1
  address ipv4
  key gns3
 radius server radius-server1
  address ipv4 auth-port 1812 acct-port 1813
  key gns3
 line con 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 line aux 0
 exec-timeout 0 0
 privilege level 15
 logging synchronous
 line vty 0 4
 transport input ssh
 line vty 5 15
 transport input ssh
 no scheduler allocate


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