- %AT-5-FDDICOMPAT : AppleTalk FDDI neighbor [atalk_address] using obsolete FDDI addressing CISCO IOS Another AppleTalk router on the FDDI ring is running a release of the router software earlier than 9.0(2). Routers running these early software releases use an encapsulation for AppleTalk on FDDI rings that is not compatible with the Apple FDDITalk implementation. Upgrade the routers running the software releases ... Login to see more Cisco IOS Comments