3Com WX1200 Reference Manual page 311

If you specify a RADIUS server group as the first method and a user is
denied access by the RADIUS server, no authentication and
authorization are attempted with the other methods specified in the
list.
If you specify LOCAL as the first method and a user is not in the local
user database on the WX, authentication and authorization are
attempted with a RADIUS server group if one is defined in the method
list.
The authentication methods you select are also used for authorization.
9 Click Next.
10 To enable an accounting rule for the SSID, select Enabled.
By default, accounting rules you configure in 3WXM are disabled, which
means 3WXM does not add the rules to the switch's configuration.
11 Select one of the following record options:
Select Start-Stop to specify that records are sent at the start of a
session and the end of a session.
Select Stop-Only to specify that records are sent only at the end of a
session.
12 Select the accounting method(s) in the Available RADIUS Server Groups
list and click Add.
The options and processing are the same as those for authentication
methods. (See step 8.)
13 Click Finish.
Viewing and Configuring 802.1X Network Access Rules 311