Chapter
3: Web Management
Security - AAA
NGSME24G4S User Manual | 103
3.1.4.15. Security - AAA
Common Server Configuration
These setting are common for all of the Authentication Servers.
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 subinterval, 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.