In order to use the Ethernet bridging functionality, you'll need the userspace tools. These programs and documentation are available at http://www.linuxfoundation.org/en/Net:Bridge. The download page is http://prdownloads.sourceforge.net/bridge. If you still have questions, don't hesitate to post to the mailing list (more info https://lists.linux-foundation.org/mailman/listinfo/bridge).