Dell PowerConnect B-RX Configuration Manual page 162

4
Configuring TACACS/TACACS+ security
To configure TACACS+ exec authorization on the device, enter the following command.
BigIron RX(config)# aaa authorization exec default tacacs+
Syntax: aaa authorization exec default tacacs+ | radius | none
If you specify none, or omit the aaa authorization exec command from the device's configuration,
no exec authorization is performed.
A user's privilege level is obtained from the TACACS+ server in the "foundry-privlvl" A-V pair. If the
aaa authorization exec default tacacs command exists in the configuration, the device assigns the
user the privilege level specified by this A-V pair. If the command does not exist in the configuration,
then the value in the "foundryprivlvl" A-V pair is ignored, and the user is granted Super User access.
NOTE
If the aaa authorization exec default tacacs+ command exists in the configuration, following
successful authentication the device assigns the user the privilege level specified by the
"foundry-privlvl" A-V pair received from the TACACS+ server. If the aaa authorization exec default
tacacs+ command does not exist in the configuration, then the value in the "foundry-privlvl" A-V pair
is ignored, and the user is granted Super User access.
Also note that in order for the aaa authorization exec default tacacs+ command to work, either the
aaa authentication enable default tacacs+ command, or the aaa authentication login
privilege-mode command must also exist in the configuration.
Configuring an Attribute-Value pair on the TACACS+ server
During TACACS+ exec authorization, the Brocade device expects the TACACS+ server to send a
response containing an A-V (Attribute-Value) pair that specifies the privilege level of the user. When
the device receives the response, it extracts an A-V pair configured for the Exec service and uses it
to determine the user's privilege level.
To set a user's privilege level, you can configure the "foundry-privlvl" A-V pair for the Exec service on
the TACACS+ server.
Example
user=bob {
default service = permit
member admin
# Global password
global = cleartext "cat"
service = exec {
}
In this example, the A-V pair
value in the foundry-privlvl A-V pair is an integer that indicates the privilege level of the user.
Possible values are 0 for super-user level, 4 for port-config level, or 5 for read-only level. If a value
other than 0, 4, or 5 is specified in the foundry-privlvl A-V pair, the default privilege level of 5
(read-only) is used. The foundry-privlvl A-V pair can also be embedded in the group configuration for
the user. Refer to your TACACS+ documentation for the configuration syntax relevant to your server.
If the foundry-privlvl A-V pair is not present, the device extracts the last A-V pair configured for the
Exec service that has a numeric value. The device uses this A-V pair to determine the user's
privilege level.
90
foundry-privlvl = 0
}
foundry-privlvl = 0
grants the user full read-write access. The
BigIron RX Series Configuration Guide
53-1001810-01