On the System Manager web console, click Users > Administrators.
In the navigation pane, click User Services > External Authentication.
On the External Identity Repositories page, click Configure in the Authentication Servers section.
On the Authentication Servers page, select the Provision RADIUS Server option.
In the Provision RADIUS Server section, enter the relevant information.
You must create two records in the external RADIUS server with the same shared secret for both the primary security server and the backup security server IP address.
Click Save.
Note:
Ensure that the Linux iptable firewall setting on both the primary and the backup security service has UDP port as the source port.