Cisco Catalyst 4500 series Administration Manual page 152

Controlling Access to Privileged EXEC Commands
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Default TACACS+ Configuration
TACACS+ and AAA are disabled by default.
To prevent a lapse in security, you cannot configure TACACS+ through a network management
application. When enabled, TACACS+ can authenticate users accessing the switch through the CLI.
Although TACACS+ configuration is performed through the CLI, the TACACS+ server authenticates
Note
HTTP connections that have been configured with a privilege level of 15.
Identifying the TACACS+ Server Host and Setting the Authentication Key
You can configure the switch to use a single server or AAA server groups in order to group existing
server hosts for authentication. You can group servers to select a subset of the configured server hosts
and use them for a particular service. The server group is used with a global server-host list and contains
the list of IP addresses of the selected server hosts.
To identify the IP host or host maintaining TACACS+ server and optionally set the encryption key,
perform this task, beginning in privileged EXEC mode:
Command
Step 1
configure terminal
Step 2
tacacs-server host hostname
] [
integer timeout integer
]
string
Step 3
aaa new-model
Step 4
aaa group server tacacs+ group-name
Step 5
server ip-address
Step 6
end
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
3-18
Configuring TACACS+ Authorization for Privileged EXEC Access and Network Services,
page 3-21
Starting TACACS+ Accounting, page 3-21
Purpose
Enters global configuration mode.
[
Identifies the IP host or hosts maintaining a TACACS+ server. Enter this
port
] [
key
command multiple times to create a list of preferred hosts. The software
searches for hosts in the order in which you specify them.
Enables AAA.
(Optional) Defines the AAA server-group with a group name.
This command puts the switch in a server group subconfiguration mode.
(Optional) Associates a particular TACACS+ server with the defined
server group. Repeat this step for each TACACS+ server in the AAA
server group.
Each server in the group must be previously defined in Step 2.
Returns to privileged EXEC mode.
For hostname, specify the name or IP address of the host.
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(Optional) For port integer, specify a server port number. The default
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is port 49. The range is 1 to 65535.
(Optional) For timeout integer, specify a time in seconds the switch
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waits for a response from the daemon before it times out and declares
an error. The default is 5 seconds. The range is 1 to 1000 seconds.
(Optional) For key string, specify the encryption key for encrypting
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and decrypting all traffic between the switch and the TACACS+
daemon. You must configure the same key on the TACACS+ daemon
for encryption to succeed.
Chapter 3 Configuring the Switch for the First Time
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