Cisco Systems 3560 사용자 설명서

software uses the first method listed to authenticate, to authorize, or to keep accounts on users. If that 
method does not respond, the software selects the next method in the list. This process continues until 
there is successful communication with a listed method or the method list is exhausted.

You should have access to and should configure a RADIUS server before configuring RADIUS features 
on your switch.

 (required)

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 (optional)

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RADIUS and AAA are disabled by default.

To prevent a lapse in security, you cannot configure RADIUS through a network management 
application. When enabled, RADIUS can authenticate users accessing the switch through the CLI.

Switch-to-RADIUS-server communication involves several components:

Hostname or IP address

Authentication destination port

Accounting destination port

Key string

Timeout period

Retransmission value

You identify RADIUS security servers by their hostname or IP address, hostname and specific UDP port 
numbers, or their IP address and specific UDP port numbers. The combination of the IP address and the 
UDP port number creates a unique identifier, allowing different ports to be individually defined as 
RADIUS hosts providing a specific AAA service. This unique identifier enables RADIUS requests to be 
sent to multiple UDP ports on a server at the same IP address. 

If two different host entries on the same RADIUS server are configured for the same service—for 
example, accounting—the second host entry configured acts as a fail-over backup to the first one. Using 
this example, if the first host entry fails to provide accounting services, the 

%RADIUS-4-RADIUS_DEAD

 

message appears, and then the switch tries the second host entry configured on the same device for 
accounting services. (The RADIUS host entries are tried in the order that they are configured.)