Brocade TurboIron 24X Series Configuration Guide - Manual (Page 121)

Brocade TurboIron 24X Series Configuration Guide 87
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Configuring TACACS/TACACS+ security
1. A Telnet or SSH user previously authenticated by a TACACS+ server enters a command on the
device.
2. The device looks at its configuration to see if the command is at a privilege level that requires
TACACS+ command authorization.
3. If the command belongs to a privilege level that requires authorization, the device consults the
TACACS+ server to see if the user is authorized to use the command.
4. If the user is authorized to use the command, the command is executed.
TACACS+ accounting
TACACS+ accounting works as follows.
1. One of the following events occur on the device:
• A user logs into the management interface using Telnet or SSH
• A user enters a command for which accounting has been configured
• A system event occurs, such as a reboot or reloading of the configuration file
2. The device checks the configuration to see if the event is one for which TACACS+ accounting is
required.
3. If the event requires TACACS+ accounting, the device sends a TACACS+ Accounting Start
packet to the TACACS+ accounting server, containing information about the event.
4. The TACACS+ accounting server acknowledges the Accounting Start packet.
5. The TACACS+ accounting server records information about the event.
6. When the event is concluded, the device sends an Accounting Stop packet to the TACACS+
accounting server.
7. The TACACS+ accounting server acknowledges the Accounting Stop packet.
AAA operations for TACACS/TACACS+
The following table lists the sequence of authentication, authorization, and accounting operations
that take place when a user gains access to a device that has TACACS/TACACS+ security
configured.
TABLE 19
User action Applicable AAA operations
User attempts to gain access to the
Privileged EXEC and CONFIG levels
of the CLI Enable authentication:
aaa authentication enable default
Exec authorization (TACACS+):
aaa authorization exec default tacacs+
System accounting start (TACACS+):
aaa accounting system default start-stop