I imagine it similar to a tracert. If the signal/snmp has to go through a device to get to the device being monitored then there should be a dependency option. I like nickzourdos representation of what the interface might look like. I have multiple nodes that pass through 3 or 4 routers/switches before getting to the poller simply because they are on different sites. I started creating dependencies but stopped because I had other things more pressing on my plate (veiled bacon reference...but I digress). I'm not sure how that would work in an SNMP world or if it's more a function of ICMP.
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