You can also find some Cisco documents on SRB, which are also available in the Documentation CD http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/srb.pdf http://www.cisco.com/univercd/cc/td/doc/cisintwk/ito_doc/srb.htm Both documents above are the same (htm/pdf) but lack for the number of bits each field of the Routing Control Field has. That information can be found on the following document: http://www.cisco.com/warp/public/100/46.html and also you will notice the difference of naming with "http://www.loopy.org/rif.cgi", something very important for us,the non-english speaking people. While Cisco Doc speaks of: "Directed frame", RIF Generator says: "Specific Route" "All route explorer" is "all rings, all routes" and "Single route explorer" becomes "Spanning route." Another document on Token Ring's Bitswapping http://www.cisco.com/warp/public/100/48.shtml Ruben _________________________________________________________________ Descargue GRATUITAMENTE MSN Explorer en http://explorer.msn.es/intl.asp Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=18884&t=18884 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]