Some of the /interface bridge settings relate to the intrinsic bridge-to-CPU port rather than the bridge itself, see http://forum.mikrotik.com/t/routeros-bridge-mysteries-explained/147832/1
Some of the /interface bridge settings relate to the intrinsic bridge-to-CPU port rather than the bridge itself, see http://forum.mikrotik.com/t/routeros-bridge-mysteries-explained/147832/1