We use DMVPN tunnels as our backup circuit. All of these run through cable modems.
I want to get monitoring up to inform when the DMVPN tunnels lose connectivity. I'm having trouble with this.
I have tried creating an alert when the routing adjacency drops to the far end of the tunnel, which isn't working. I need the alert to only trigger when both tunnels are down simultaneously.
Trigger Alert when: All child conditions must be satisfied (AND)
Routing Neighbors Instance is <IP of operations end of DMVPN tunnel #1)
Routing Neighbors Instance is <IP of operations end of DMVPN tunnel #2)
At least one child condition must be satsfied (OR)
Routing Neighbors Protocol Orion Status is equal to Down
Routing Neighbors Is Deleted is equal to Yes.
I had thought to create an alert that triggered on the operational status of the interface using a Custom Node Poller based on devices being in the DMVPN group. However, as long as the port on the cable modem and the port on the switch are up, this won't trigger the alert for monitoring effectively enough to be useful, as far as I can tell.
Any suggestions would be appreciated. I've tried multiple suggestions based on searches for DMVPN alerting, but none of them address my specific needs.
