This gauge reports the total number of VPDN tunnels (L2F, L2TP, or PPTP) that are currently active on this router, system-wide. An administrator monitors it as a top-level capacity and health indicator, since a sudden drop can mean tunnels are failing to establish or are being torn down unexpectedly, while a value near a known platform maximum signals the box is close to its tunnel capacity. For example, a network operations team might alert if this value falls to zero on a router that is supposed to be terminating dozens of remote-access VPDN tunnels.