RFC 2698 (rfc2698) - Page 3 of 5

A Two Rate Three Color Marker

RFC 2698             A Two Rate Three Color Marker        September 1999


3. Metering

   The behavior of the Meter is specified in terms of its mode and two
   token buckets, P and C, with rates PIR and CIR, respectively.  The
   maximum size of the token bucket P is PBS and the maximum size of the
   token bucket C is CBS.

   The token buckets P and C are initially (at time 0) full, i.e., the
   token count Tp(0) = PBS and the token count Tc(0) = CBS.  Thereafter,
   the token count Tp is incremented by one PIR times per second up to
   PBS and the token count Tc is incremented by one CIR times per second
   up to CBS.

   When a packet of size B bytes arrives at time t, the following
   happens if the trTCM is configured to operate in the Color-Blind
   mode:

     o If Tp(t)-B RFC 2597], the color can be coded as the drop precedence of the
   packet.






Heinanen & Guerin            Informational