Are you ready to move on? Either internally or externally? Here's how you go about it.
First, revise your resume.
Seriously, even if you are hoping to be promoted internally and stay within the same department with the same boss. Even if you are looking for simply a “growth promotion” where you essentially stay in the same job, but with greater responsibility and (hopefully!) better pay. Here's why: Your boss doesn't know everything you do. No boss does. Not because the boss is bad, but because bosses are busy. Your resume should focus on your accomplishments, not your tasks.
Writing up your resume, even if you don't actually show it to anyone, helps you realize where your strengths and weaknesses are. It also can give you a sense of satisfaction to see, in black and white, what you've really accomplished in your current job.