RFC4098 - Terminology for Benchmarking BGP Device Convergence in the Control Plane

   1.  Tup(1,TDx) means Device x sends 1 route

   2.  Tup(S,TDx) means Device x sends a train, S, of routes

   3.  Tup(DFT,TDx) means Device x sends an approximation of a full
       default-free table.

   The basic criterion for selecting a "better" route is the final
   tiebreaker defined in RFC 1771, the router ID.  As a consequence,
   this memorandum uses the following descriptor events, which are
   routes selected by the BGP selection process rather than simple
   updates:

   1.  Tbest   -- The current best path.

   2.  Tbetter -- Advertise a path that is better than Tbest.

   3.  Tworse  -- Advertise a path that is worse than Tbest.

6.2.  Device Convergence in the Control Plane

   Definition:
      A routing device is said to have converged at the point in time
      when the DUT has performed all actions in the control plane needed
      to react to changes in topology in the context of the test
      condition.

   Discussion:
      For example, when considering BGP convergence, the convergence
      resulting from a change that alters the best route instance for a
      single prefix at a router would be deemed to have occurred when
      this route is advertised to its downstream peers.  By way of
      contrast, OSPF convergence concludes when SPF calculations have
      been performed and the required link states are advertised onward.
      The convergence process, in general, can be subdivided into three
      distinct phases:

      *  convergence across the entire Internet,

      *  convergence within an Autonomous System,

      *  convergence with respect to a single device.

      Convergence with respect to a single device can be

      *  convergence with regard to data forwarding process(es)

      *  convergence with regard to the routing process(es), the focus

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