The usefulness of a network map is not just about looking good. If it is understood what data each link is produced from, it can be used safely in map maintenance decisions.
Basic approach
Neighborhood information, MAC forwarding record, and IP routing relationship do not have the same evidentiary strength. Seeing the device behind a port does not always prove a direct physical cable connection. If there are conflicting sources, uncertainty must be preserved.
Application steps
- Keep the source and observation time of each line visible.
- Represent verified neighborhood with different line shapes than routing inference.
- Keep devices whose physical connection is unknown in a separate group instead of automatically connecting them to the gateway.
Practical example
If twenty devices appear in the FDB record of an uplink port, the map should not show them all plugged directly into the first switch. If the switch is unknown, it would be better to present it as a direction or uncertainty.
Interpret the result correctly
A map is the view at the time of scanning; continuous real-time monitoring should not be assumed. Renew the sources after cable replacement. Include the line description used when sharing the report; the recipient does not have to guess the meaning of the dotted line.
Source and follow-up reading
Protocol or command details: RFC 4188. The steps and example scenario are IPScans editorial narrative.