White Papers

Version Description
9.8(0.0P5) Introduced on the S4048-ON.
9.8(0.0P2) Introduced on the S3048-ON.
9.7(0.0) Introduced on the S6000–ON.
9.2(1.0) Introduced on the Z9500.
9.0.2.0 Introduced on the S6000.
8.3.19.0 Introduced on the S4820T.
8.3.11.1 Introduced on the Z9000.
8.4.1.0 Added support for IPv6.
8.3.7.0 Introduced on the S4810.
7.7.1.0 Authentication key length increased to 42 characters.
7.6.1.0 Introduced on the S-Series.
7.5.1.0 Introduced on the C-Series.
pre-6.2.1.1 Introduced on the E-Series.
Usage
Information
To list multiple TACACS+ servers to be used by the aaa authentication login command,
configure this command multiple times.
If you are not configuring the switch as a TACACS+ server, you do not need to configure the port,
timeout and key optional parameters. If you do not configure a key, the key assigned in the tacacs-
server key command is used.
You can use duplicate host names or IP addresses among TACACS groups. However, you cannot use
duplicate host names or IP addresses within the same TACACS group.
If a VRF is not configured on the TACACS group, then servers configured in the group are considered
to be on the default VRF. TACACS servers that are configured in the CONFIGURATION mode are also
considered to be on the default VRF.
For AAA servers to use a group of TACACS servers, you must explicitly configure the group using the aaa
tacacs group group-name command. The order in which the TACACS servers are tried depends on
the order in which they are configured.
Example
DellEMC(conf)# tacacs-server group group1
DellEMC(conf-tacacs-group)# tacacs-server host 1.1.1.1 key secr-et
DellEMC(conf-tacacs-group)# no tacacs-server host 1.1.1.1
DellEMC(conf-tacacs-group)#
Related
Commands
● aaa authentication login — specifies the login authentication method.
● tacacs-server key — configures a TACACS+ key for the TACACS server.
tacacs-server key
Configure a key for communication between a TACACS+ server and a client.
Syntax
tacacs-server key [encryption-type] key
To delete a key, use the no tacacs-server key key command.
Parameters
encryption-type (OPTIONAL) Enter either zero (0) or 7 as the encryption type for the key entered.
The options are:
● 0 is the default and means the key is not encrypted and stored as clear text.
● 7 means that the key is encrypted and hidden.
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