The most interesting one for your needs will be the objects in the CISCO-IPSEC-FLOW-MONITOR-MIB. You'll probably want to look at the cipSecTunnelTable objects in particular.
Advantage of VPNTTG over other SNMP based monitoring software’s is following: Other (commonly used) software’s are working with static OID numbers, i.e. whenever tunnel disconnects and reconnects, it gets assigned a new OID number. This means that the historical data, gathered on the connection, is lost each time. However, VPNTTG works with VPN peer’s IP address and it stores for each VPN tunnel historical monitoring data into the SQL server and into the RRD (Round Robin Database) file.
HTH
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