With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
alL2tpStatsSessionRecvZLB
ALTIGA L2tp Statistics Session Receive ZLB
1.3.6.1.4.1.3076.2.1.2.16.3.1.28
This object returns the total number of Zero Length Body acknowlegement payload packets received for this session.
Back to ALTIGA-L2TP-STATS-MIB MIB page.
IPHost Network monitor allows you to monitor alL2tpStatsSessionRecvZLB on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.