We are currently using WhatsUp Gold to monitor up/down time for our Network Devices, including Cisco Routers, Switches, VPN and Firewall. When any one of the monitored devices go down, it will send me an alert.
WhatsUp Gold is an industry leading product providing excellent monitoring and reporting capabilities for systems and resources that allow us as the customer to work proactively before system outages occur, which minimizes potential downtime
We use WhatsUp Gold to identify issues quickly and monitor repeated issues to help develop a more complete root cause. Keep in mind you can accomplish all of your inventory needs by using WhatsUp Gold.