CERN
   European Laboratory for Particle Physics
   1211 Geneva 23, Switzerland

   Phone:  +41 22 767-4967
   Fax:    +41 22 767-7155
   Telex:  419000 cer ch
   EMail: brian@dxcoms.cern.ch


   Yakov Rekhter
   cisco Systems
   170 West Tasman Drive
   San Jose, CA 95134

   Phone: (914) 528-0090
   EMail: yakov@cisco.com