Virtual Network Visualization
OpenSolaris supports virtual networks using virtual interfaces connected with virtual switches.
This feature was introduced with Project Crossbow in OpenSolaris 2009.06.
To visualize the internal network(s), I created a perl script which takes the output of dladm show-link and generates a dot-File, which then can be rendered using Graphviz.
Here's an example:

As DokuWiki is much better with code-formating, you can find all the details here: http://andunix.net/solaris/dladm2dot