In an scenario like the one described, since ISG is working as DHCP relay, the releasing of the IP address will have to be initiated by the client dy sending a DHCP release. ISG cannot do anything on it's own to trigger the release.
When the subscriber powers off the PC, does the PC DHCP client sends a DHCP release? If so, is the DHCP release relayed by ISG to the DHCP server? If the client doesn't send the release, then, as explained, I'm affraid there is not much ISG can do about it. You will have to handle that using the lease timer.
policy-map type service KEEP keepalive attempts 2 protocol ARP ! policy-map type control TESTRAD class type control always event session-start 5 service-policy type service name KEEP 20 authorize aaa list ISG-AUTHOR identifier circuit-id
It's up to you to apply good keepalive parameters, but in a nutshell it does send ARP or ICMP keepalive in case of idle link. If there is no answer from client CPE, then the session is terminated.
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