Dell PowerConnect B-RX - Page 169

BigIron RX Series Configuration Guide 93
53-1002253-01
Configuring TACACS and TACACS+ security
4
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 BigIron RX 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.
user=bob {
default service = permit
member admin
# Global password
global = cleartext "cat"
service = exec {
foundry-privlvl = 0
}
}
In this example, the A-V pair foundry-privlvl = 0 grants the user full read-write access. The
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 BigIron RX extracts the last A-V pair configured for
the Exec service that has a numeric value. The BigIron RX uses this A-V pair to determine the user’s
privilege level.
user=bob {
default service = permit
member admin
# Global password
global = cleartext "cat"
service = exec {
privlvl = 15
}
}
The attribute name in the A-V pair is not significant; the BigIron RX uses the last one that has a
numeric value. However, the BigIron RX interprets the value for a non-”foundry-privlvl” A-V pair
differently than it does for a “foundry-privlvl” A-V pair. The following table lists how the BigIron RX
associates a value from a non-”foundry-privlvl” A-V pair with a Brocade privilege level.
TABLE 36 Brocade equivalents for non-“foundry-privlvl” A-V pair values
Value for non-“foundry-privlvl” A-V pair Brocade privilege level
15 0 (super-user)
From 14 – 1 4 (port-config)
Any other number or 0 5 (read-only)