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Chapter 5: Management
Table 5-73. Authentication Server Configuration screen options.
Label Description
Timeout The timeout, which can be set to a number between 3 and 3600 seconds, is the maximum time to wait for
a reply from a server.
If the server does not reply within this time frame, we will consider it to be dead and continue with the next
enabled server (if any).
RADIUS servers are using the UDP protocol, which is unreliable by design. In order to cope with lost frames,
the timeout interval is divided into 3 subintervals of equal length. If a reply is not received within the subin-
terval, the request is transmitted again. This algorithm causes the RADIUS server to be queried up to 3 times
before it is considered to be dead.
Dead Time The dead time, which can be set to a number between 0 and 3600 seconds, is the period during which the
switch will not send new requests to a server that has failed to respond to a previous request. This will stop
the switch from continually trying to contact a server that it has already determined as dead.
Setting the dead time to a value greater than 0 (zero) will enable this feature, but only if more than one
server has been configured.
5.8.5 RADIUS
Authentication and Accounting Server Configurations
The table has one row for each RADIUS authentication server and a number of columns, which are:
Figure 5-94. RADIUS Authentication and Accounting Server Configurations screen.
Table 5-74. RADIUS Authentication and Accounting Server Configurations screen options.
Label Description
# The RADIUS authentication server number for which the configuration below applies.
Enabled Check to enable the RADIUS authentication server.
IP Address The IP address or hostname of the RADIUS authentication server. IP address is expressed in dotted decimal
notation.
Port The UDP port to use on the RADIUS authentication server. If the port is set to 0 (zero), the default port
(1812) is used on the RADIUS authentication server.
Secret The secret—up to 29 characters long—shared between the RADIUS authentication server and the switch
stack.