We needed IP feature sets to run BGP in our network. 12.2(26) went ok and allows us to implement DSCP in a PIP network. The IP (only) feature set works fine for BGP on the 3640, 2610's, and 1700's. ON the 1600's it as advertised as a choice to implement in the menu, but exclaims, "UNKNOWN ROUTING PROTOCOL" when you choose it. Is this just sloppy inconsistency, or a flaw in this particular ios.c1600-y-l.122-26a.bin