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Radius Accounting for L2TP's LAC


We've setup the VPDN (using L2TP) using RADIUS as AAA server. The authentication part has no problem for both LAC and LNS using two RADIUS servers.

For example when the user login using, the LAC will authenticate to LAC radius server using and then the LNS will authenticate to the LNS radius server using the full name

But for AAA accounting, both the LAC and LNS will use as the user ID to send the RADIUS accounting. In the LAC RADIUS server, only user ID exists. My RADIUS servr will drop this accounting packet. Is it possible to configure the LAC router to use as the user ID to send the RADIUS accounting?




Re: Radius Accounting for L2TP's LAC

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.