H3C S5830V2 Security Configuration Manual page 40

Setting the status of RADIUS servers
By setting the status of RADIUS servers to blocked or active, you can control the RADIUS servers with
which the device communicates when the current servers are no longer available. In practice, you can
specify one primary RADIUS server and multiple secondary RADIUS servers, with the secondary servers
functioning as the backup of the primary servers. Typically, the device chooses servers based on these
rules:
• When the primary server is in active state, the device communicates with the primary server.
If the primary server fails, the device changes the server's status to blocked, starts a quiet timer for
the server, and tries to communicate with a secondary server in active state (a secondary server
configured earlier has a higher priority).
If the secondary server is unreachable, the device changes the server's status to blocked, starts a
quiet timer for the server, and continues to check the next secondary server in active state. This
search process continues until the device finds an available secondary server or has checked all
secondary servers in active state.
If the quiet timer of a server expires or you manually set the server to the active state, the status of
the server changes back to active, but the device does not check the server again during the
authentication or accounting process.
If no server is found reachable during one search process, the device considers the authentication
or accounting attempt a failure.
• If you remove an authentication or accounting server in use, the communication of the device with
the server soon times out, and the device looks for a server in active state by first checking the
primary server and then secondary servers in the order they are configured.
When the primary server and secondary servers are all in blocked state, the device does not
•
communicate with any server.
If one server is in active state and all the others are in blocked state, the device only tries to
•
communicate with the server in active state, even if the server is unavailable.
• If the status of a RADIUS server changes automatically, the device changes the status of this server
accordingly in all RADIUS schemes in which this server is specified.
By default, the device sets the status of all RADIUS servers to active. In some cases, however, you must
change the status of a server. For example, if a server fails, you can change the status of the server to
blocked to avoid communication attempts to the server.
To set the status of RADIUS servers:
Step
1. Enter system view.
2. Enter RADIUS scheme view.
Command
system-view
radius scheme radius-scheme-name
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Remarks
N/A
N/A