Nagios Support Forum

We have a pretty big environment so the network map just turns out to be a huge blob of test overlaying each other. It would be nice to be able to start filtering by say service groups or hostgroups so that this function can display a network map that's useful. Unless there are suggestions?

You can try using the Hypermap instead of the "Network Status Map". With hypermap, you can zoom in/out by scrolling the mouse wheel, you can re-position a host in the center, etc. If you really want to use the "Network Status Map", you could try the "new" map in Nagios Core (not the legacy one):
It has some extra options, compared to the "legacy" one. In fact, we will be adding it to XI as well.

You can also try a "workaround" with the "legacy" map - set up dummy hosts, corresponding to your hostgroups, i.e. linux-servers, windows-servers, websites, etc. Set up each of the dummy hosts as a parent of the members of the corresponding hostgroups. Make sure, all of the parent-child relationships are set up properly.
Note: This may or may not work with your setup, depending on how large it is.