What are the critical things to monitor on a switch and a router?
Uplinks on switches. Physical interfaces on routers. Routing protocols/ neighbors on routers.
CPU and memory on each.
Which routing protocol are the routers running? Which vendor/ model?
Cisco/eigrp
uplinks and interfaces on routers... node status.
You can modify BGP alert for use with EIGRP:
Routing Neighbor Down alert does not trigger for EIGRP - SolarWinds Worldwide, LLC. Help and Support
When you list resources on the router, are you given the option to monitor EIGRP? If so, ensure that you select it. (I don't have a way to test...hence my question.)