UC Santa Cruz

OPERA is a framework  recently introduced  that formalizes routing etiquettes based on path information.  New  rules derived from OPERA  to provide total ordering among paths are added to the  policy mechanisms used in IBGP and EBGP, which results in OPERA-based  BGP (OBGP).  OBGP is a complete  loop-free inter-domain multi-path routing solution based on IBGP and EBGP. OBGP is proven to be stable and loop-free at every instant. Well-known examples of systems in which IBGP and EBGP do not converge are used to illustrate the benefits of OBGP.