H3C S6812 Series Command Reference Manual page 1749

string: Specifies the key. This argument is case sensitive.
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In non-FIPS mode, the encrypted form of the key is a string of 1 to 373 characters. The plaintext
form of the key is a string of 1 to 255 characters.
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In FIPS mode, the encrypted form of the key is a string of 15 to 373 characters. The plaintext
form of the key is a string of 15 to 255 characters. The plaintext string must contain digits,
uppercase letters, lowercase letters, and special characters.
single-connection: The device and the secondary HWTACACS authentication server use the same
TCP connection to exchange all authentication packets for all users. If you do not specify this
keyword, the device establishes a new TCP connection each time it exchanges authentication
packets with the secondary authentication server for a user.
Usage guidelines
Make sure the port number and shared key settings of each secondary HWTACACS authentication
server are the same as those configured on the corresponding server.
An HWTACACS scheme supports a maximum of 16 secondary HWTACACS authentication servers.
If the primary server fails, the device tries to communicate with a secondary server in active state.
The device connects to the secondary servers in the order they are configured.
If you do not specify any parameters for the undo secondary authentication command, the
command removes all secondary authentication servers.
Two authentication servers specified for a scheme, primary or secondary, cannot have identical IP
address and port number settings.
As a best practice, specify the single-connection keyword to reduce TCP connections for improving
system performance if the HWTACACS server supports the single-connection method.
You can remove an authentication server only when it is not used for user authentication. Removing
an authentication server affects only authentication processes that occur after the remove operation.
Examples
# In HWTACACS scheme hwt1, specify a secondary authentication server with IP address
10.163.155.13, TCP port number 49, and plaintext shared key 123456TESTauth&!.
<Sysname> system-view
[Sysname] hwtacacs scheme hwt1
[Sysname-hwtacacs-hwt1] secondary authentication 10.163.155.13 49 key simple
123456TESTauth&!
Related commands
display hwtacacs scheme
key (HWTACACS scheme view)
primary authentication (HWTACACS scheme view)
secondary authorization
Use secondary authorization to specify a secondary HWTACACS authorization server.
Use undo secondary authorization to remove a secondary HWTACACS authorization server.
Syntax
secondary authorization { ipv4-address | ipv6 ipv6-address } [ port-number | key { cipher | simple }
string | single-connection ] *
undo secondary authorization [ { ipv4-address | ipv6 ipv6-address } [ port-number ] ]
Default
No secondary HWTACACS authorization servers are specified.
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