3Com 3C15500 - Network Director - PC, User Manual

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Key Concepts 103
Director at the end of the discovery process. Always check the Discovery
report first when your discovered network map appears to be incorrect.
Sometimes clouds appear in the core of the network when a key, core
device has not been discovered properly:
Figure 25 Clouds – Core Device Failed to be Fully Discovered
Hover the mouse over the links to each of the Switches. If one of them
shows no unit or port details, it is likely that this switch should have been
positioned where the cloud is. If all the switches give unit and port
details, it is likely that there is another device that should be positioned
where the cloud is, but that was not detected by 3Com Network Director.
Other Clouds
Sometimes 3Com Network Director deliberately shows clouds, even
when it successfully communicated with all devices during the topology
process. These are: