With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alPPPoEStatsIfDuration
Statistics If Duration
1.3.6.1.4.1.3076.2.1.2.40.2.1.15
Number of seconds since the session was established.
Back to ALTIGA-PPPOE-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alPPPoEStatsIfDuration on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.