yes and no:
http://www.cisco.com/en/US/products/hw/routers/ps259/prod_bulletin09186a00800921e4.htmlYou have the config correct, so if you apply the config to a non-802.3u, say a 802.3i (10Mbps Ethernet)
and it fails and the device is not on that list, or not in the feature navigator for supported devices, then no.
Take care
Billy