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This article describes how to monitor Cisco ASA VPN tunnels by monitoring a secondary variable from the Cisco MIB trees and using this information to infer the status of the tunnel.
Monitoring of the UP/Down status of a Cisco ASA VPN tunnel is not as straight forward as a regular physical or VLAN interface. This is because VPN tunnels fall outside the scope of RFC 1213 MIB's ifTabletree.