We prefer to use Panduit Style cable management for a really clean look when installing a switch in a 19" rack. They look nice, but they’re a little pricey. A 2U 19" double-sided horizontal cable manager can run approximately $50. If you’re on a budget, you can get the spiral binders that are used to bind papers together and tape them to the top of your switch. Leave a gap large enough to run your patch cables from the back to the front of the switch and feed the patch cables through the spirals for a neat appearance. You can get a 100-binding comb for less than $40.