> From: Paul Koning > That was then adopted by OSI as IS-IS, and further tweaked to become > OSPF.
Err, no. OSPF was not a descendant of IS-IS - it was a separate development, based mainly on the ARPANET's original link state routing. (I can't recall if John Moy and I took a lot from the later 'area' version of the ARPANET link state, although we knew of it.) I think we became aware of IS-IS as OSPF progressed, and IIRC John 'borrowed' a few ideas (maybe the sequence number thing). IS-IS was later evolved to handle both OSI and IP addresses (and has, I assume, since been extended to handle IPv6 too). Noel