A trap message processed for discovery purposes conveys one of the following conditions for a device in the managed network:
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A device, not yet in the modeled topology, was started.
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A device, already in the modeled topology, was equipped with an additional field replaceable unit (FRU) or had an FRU removed; for example, a card was inserted into the device.
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A device, already in the modeled topology, had a TCP connection closed by a remote application; for example, a Telnet session to the device was terminated.