This indicates how many seconds elapse between accounting
interim updates. This parameter value is maintained across
system reboots. A value of zero means no Interim Updates.
If the value is less than etsysRadiusAcctClientIntervalMinimum,
the etsysRadiusAcctClientIntervalMinimum value will be used
for the update interval time. If RADIUS Accounting is not
enabled, this object is ignored. Note that Accounting
Interim Updates are not issued by the RADIUS Accounting
Client, unless so requested by the RADIUS Server in an Access
Accept packet.