With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alL2tpStatsSessionOutOfWindow
ALTIGA L2tp Statistics Session Out Of Window
1.3.6.1.4.1.3076.2.1.2.16.3.1.30
This object returns a count of the number of payload packets that were received outside of the expected window for this session.
Back to ALTIGA-L2TP-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alL2tpStatsSessionOutOfWindow 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.