Why do I have to do an internal job interview?

by Amber
(Houston)

There is a job opening in my department that I really want. It would be a step up for me in responsibility. My company has the job posted to their website...which means they are accepting outside and inside candidates.

I'm annoyed my boss didn't even approach me about it. So, I went to him and asked him if he would consider me for the position. My boss told me to submit my resume and he would interview me.

Why do I have to do an internal interview?

My boss knows me well and the quality of my work. This seems like a big waste of time.