If you’re running an LNS terminating PPP sessions on Cisco, here’s a quick tip for forcing a reconnect of an end user session.
First find the session that you’re after and wanting to clear
lns-1#show vpdn session | i 09033847111 30532 29804 31238 firstname.lastname@example.org, Vi2.6 est 1w5d 510 lns-1#
Take the Interface name from the session and run the below to clear it. This will force the session to re-establish.
lns-1#clear interface Virtual-Access2.6