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Configuring UDP Ports for RADIUS Plug-Ins

In RADIUS packets that RADIUS plug-ins send to a RADIUS server, the plug-in uses an identifier field to match requests to replies. This field provides for a maximum of 256 identifiers. Once all identifiers are used, the plug-in cannot send any more requests until it receives replies that match the requests already sent. In high-load systems, this limit can slow performance.

To overcome this limitation, you can configure a pool of UDP ports for RADIUS plug-ins. Having a pool of ports allows RADIUS plug-ins to create one queue per port to wait for RADIUS replies. Each queue can wait for 256 RADIUS packets. The RADIUS plug-ins send RADIUS packets through the pool of ports in a round-robin mode.

You can configure a global source UDP port or pool of ports that RADIUS plug-ins use to communicate with RADIUS servers. You can also configure UDP ports for each plug-in instance. If you do not configure a UDP port for a plug-in instance, the plug-in uses the global UDP port.

Configuring Global UDP Ports

To configure global UDP ports with SDX Configuration Editor:

  1. In the navigation pane, select a directory configuration object for the SAE that you want to configure.
  2. Select the Miscellaneous tab, and expand the Global RADIUS UDP Port section.
  3. Fill in the field as described in Global RADIUS UDP Port Field.

Global RADIUS UDP Port Field

Use the field in this section to specify a global UPD port for RADIUS plug-ins.

UDP Port


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