Critical Alerts for Router/ISP Down or Unreachable

Critical Alerts for Router/ISP Down or Unreachable

I'm looking for the best way to configure monitoring alerts ONLY for when the router/switch/ISP/Power is down/unreachable. I'm in the process of setting up thresholds, templates, and alerts but had to disable temporarily as were getting many email alerts. Ill eventually re-enable alerts for CPU, Mem, buffer, tempatyre, packet loss etc.... We have over 30+ branch offices and our primary way we would like to monitor is by getting a CRITICAL ALERT/email notification if the router uplink is unreachable. Any suggestions on the best way to set this up? Thank You
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