*>Any links out there? Can't seem to find any that do OSI over IP tunnelling.* *>I can find those that will allow me to enable IS-IS routing for CLNS or do IP over OSI tunneling. None for OSI over IP tunnelling. Any pointers are appreciated*. What router are you using ? Enabling IS-IS routing should be as simple as: (in config mode - enable clns routing) clns routing (in config mode 0 define the area name + address) router isis <clns > net <NSAP Address> (in interface/subinterface - enable ISIS on a particular interface) clns router isis <area name> you can do the clns tests: ping clns <nsap address> show clns neighbours look around the cisco site - there were some docs there some times ago. http://www.ciscopress.com/articles/article.asp?p=31213 Regards, Josiah