nanog (oct2002): ISP/researcher interaction bgp enhancements to prevent persistent route oscillations major factors for route oscillation: dependency of IBGP updates sometimes circular dependency partial information by RR or confederation withdraws (over reduction) amplifies the issue partial order (due to MED) in route selection suggestions: modify route reflection spec, allow advertisement of multiple paths issues: non-deterministic routing can be demonstrated within full mesh topology MEDs prevent reasoning about routing policies though existing references encourage use of MEDs to influence inbound policies how much are we facing limitations of distance vector protocol and inherent limitations of same can't tell what tie-breakers cause route selection..