Sophomore year internship to Junior Year Internship within the same bank

I've got a sophomore year internship at a well-known bank (not within IB) and I'm curious about how to go about leveraging that for my junior year internship within their IBD at the same bank? I am speaking in terms of going about networking, speaking to HR, get recs from the people I work with this summer (if they could give recs since they won't be in the IB division)  Any advice would be appreciated. I am not at a target so I feel like working internally to get into IB would be the easiest case to break in.