One option you may want to try is a view limitation. Edit the actual view and pop in Vendor = 'Cisco' or Vendor = 'Windows'. You'd end up creating two views, but it should get you what you're looking for.
Good thought. Doesn't work, but a good idea I had forgotten about. A very hard coded view.
this is actually not possible but it is a very good request. I've created a feature request for this.