Once you have created a map, you will need to be able to read it. The links on the graph might display different colours. The colours show the status of the link.
The Event status key:
It is possible that an interface can be selected and graphed, but has no alarms associated with it. It will therefore be grey. This happens when there are no thresholds set for that link.
By default, Iris has thresholds set for all traffic, errors and discards. Clicking on Events -> Current Events will indicate what Iris is monitoring.