Allied Telesis AlliedWare Plus Operating System Version 5.4.4C (x310-26FT,x310-26FP,x310-50FT,x310-50FP) - Manual (Page 1263)

RADIUS Introduction and Configuration
Software Reference for x310 Series Switches
C613-50046-01 REV A AlliedWare Plus TM Operating System - Version 5.4.4C 46.13
Configuring AAA Server Groups with Deadtime
After you have configured a server host with a server name, you can use the deadtime
(RADIUS server group) command to configure each server per server group. Configuring
deadtime within a server group allows you to direct AAA traffic to separate groups of
servers that have different operational characteristics.
Configuring deadtime is no longer limited to a global configuration. A separate timer has
been attached to each server host in every server group. When a server is found to be
unresponsive after numerous retransmissions and time-outs, the server is assumed to be
dead. The timers attached to each server host in all server groups are triggered. In essence,
the timers are checked and subsequent requests to a server, once it is assumed to be dead,
are directed to alternate servers, if configured. When the network access server receives a
reply from the server, it checks and stops all configured timers, if running, for that server in
all server groups.
If the timer has expired, only the server to which the timer is attached is assumed to be
alive. This becomes the only server that can be tried for later AAA requests using the
server groups to which the timer belongs.
The size of the server group will be increased because of the addition of new timers and
the deadtime attribute. The overall impact of the structure depends on the number and
size of the server groups and how the servers are shared among server groups in a specific
configuration.
To configure deadtime within a server group, use the following commands beginning in
the Global Configuration mode:
Note Since one server has different timers and may have different deadtime values
configured in the server groups, the same server may in the future have
different states, dead and alive, at the same time. To change the state of a
server, you must start and stop all configured timers in all server groups.
Mode and Command Command Purpose
awplus(config)#
aaa group server radius
group1
Defines a RADIUS type server group.
awplus(config-sg)#
deadtime 1
Configures and defines a deadtime value in
minutes.
awplus(config-sg)#
exit
Exits server group configuration mode.