You can use PDM to gain basic VPN status such as throughput, connections, etc.
You can use CiscoWorks Monitoring Center for Performance, Version 2.0, which is part of Cisco Works VMS (http://www.cisco.com/go/vms) for a more advanced view of the status of your VPN.
Here's more info from the Data Sheet for MC for Performance:
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CiscoWorks Monitoring Center for Performance, Version 2.0
The Monitoring Center for Performance 2.0 component, within the CiscoWorks VPN/Security Management Solution (VMS), is a web-based tool for monitoring and troubleshooting the health and performance of services that contribute to enterprise network security. The Monitoring Center for Performance enables users, without requiring expertise with IPSEC or other security technologies, to increase service availability by isolating, troubleshooting significant events in their network as they occur.
The Monitoring Center for Performance can monitor and troubleshoot health and performance of:
Cisco VPN Concentrators
Cisco VPN Routers
Cisco PIX Firewalls
Cisco Catalyst Firewall Service Modules
Cisco Catalyst VPN Service Modules
Cisco Catalyst CSM Service Modules
Cisco Catalyst SSL Service Modules
The Monitoring Center for Performance increases overall VPN and Firewall availability, by providing fault analysis. The software also increases operational efficiencies in reduced time to identify and correct system failures, by providing automated delivery of alerts. By taking advantage of the real time monitoring functionality, the operator can:
Monitor the status of all the VPN's and VPN-related aspects of all devices provisioned through the CiscoWorks VMS Management Centers respectively for Firewalls and VPN Routers, or directly via the Cisco VPN3000 Device Manager.
Graphically illustrate the correlation between various metrics associated with active VPNs
On a per device basis, identify all the networks and users connected by VPNs
Monitor the real time device statistics of Firewalls
Receive early notification of system failures.
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Hope this helps,
peter
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