Users Guide

Authentication, Authorization, and Accounting 313
can be shared by many clients on a large network. TACACS+ uses TCP to
ensure reliable delivery and a shared key configured on the client and daemon
server to encrypt all messages.
If TACACS+ is configured as the authentication method for user login and a
user attempts to access the user interface on the switch, the switch prompts
for the user login credentials and requests services from the TACACS+
client. The client then uses the configured list of servers for authentication,
and provides results back to the switch.
Figure 9-2 shows an example of access management using TACACS+.
Figure 9-2. Basic TACACS+ Topology
The TACACS+ server list can be configured with one or more hosts defined
via their network IP addresses. Each can be assigned a priority to determine
the order in which the TACACS+ client will contact the servers. TACACS+
contacts the server when a connection attempt fails or times out for a higher
priority server.
Each server host can be configured with a specific connection type, port,
timeout, and shared key, or the server hosts can be globally configured with
the key and timeout.
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Management Host
Primary TACACS+ Server
Backup TACACS+ Server
Management
Network
Dell EMC Networking N-Series
switch