Link Aggregation with Aiport Extreme and a TEG-160WS

I have a early 2008 Mac Pro which is currently connected to my home network using a Airport Extreme Dual Band Gigabit router.

I had a hard disk fail, and decided to improve the reliability of my storage by upgrading to an NAS. I just bought a Synology DS1511+ NAS which has two ethernet ports that can be combined using Link Aggregation.

I also bought a Trendnet TEG-160WS 16-port switch which supports link aggregation.

My plan is to keep the Airport Extreme as my connection to the WAN, and connect the Trendnet to the Airport Extreme. I would then connect all of my computers and my ethernet printer to the Trendnet. I plan on using both ethernet ports on my MacPro to set up link aggregation, and will do the same with the DS1511+.

I am assuming (hoping) that the local network traffic will all stay within the Trendnet switch so that I will be able to take advantage of the link aggregation for transfers between my Mac Pro and the DS1511+. Is this a correct assumption?

Any help / advice would be greatly appreciated.

Thanks!

Ron Miller