Matthias, are you referring to Hub-based KB 5115, "
Simplified Explanation of Routed Connection Setup for the DFE"?  
The original source document was drafted in pre-Policy days (Jun 11 2003).  
If this document is not a match, then a few more clues - such as product, era, or author - might help to focus the search.  
That EOS document should provide a good baseline to evolve an EXOS-related discussion.  
Thank you.