3Com Switch 8800 Family Configuration Guide

Configuring RADIUS Protocol 251
Perform the following configuration in RADIUS scheme view.
By default, selection of RADIUS accounting option is disabled.
Setting a Real-time
Accounting Interval
To implement real-time accounting, it is necessary to set a real-time accounting
interval. After the attribute is set, NAS will transmit the accounting information of
online users to the RADIUS server regularly.
You can use the following command to set a real-time accounting interval.
Perform the following configuration in RADIUS scheme view.
minute specifies the real-time accounting interval in minutes. The value shall be a
multiple of 3.
The value of minute is related to the performance of NAS and RADIUS server. The
smaller the value is, the higher the performances of NAS and RADIUS are required.
When there are a large amount of users (more than 1000, inclusive), we suggest a
larger value. The following table recommends the ratio of minute value to the
number of users.
By default, minute is set to 12 minutes.
Setting the Maximum
Times of Real-time
Accounting Request
Failing to be Responded
RADIUS server usually checks if a user is online with timeout timer. If the RADIUS
server has not received the real-time accounting packet from NAS for long, it will
consider that there is device failure and stop accounting. Accordingly, it is
necessary to disconnect the user at NAS end and on RADIUS server synchronously
when some unpredictable failure exists. 3Com Series Switches support to set
maximum times of real-time accounting request failing to be responded. NAS will
disconnect the user if it has not received real-time accounting response from
RADIUS server for some specified times.
Tab le 216 Enable the selection of RADIUS accounting option
Operation Command
Enable the selection of RADIUS accounting option accounting optional
Disable the selection of RADIUS accounting option undo accounting optional
Tab le 217 Set a real-time accounting interval
Operation Command
Set a real-time accounting interval timer realtime-accounting minute
Restore the default value of the interval undo timer realtime-accounting
Tab le 218 Recommended real-time accounting intervals for different number of users
Number of users Real-time accounting interval in minutes
1 to 99 3
100 to 499 6
500 to 999 12
Š1000 Š15