Manual Pages for UNIX Operating System command usage for man tswtclmt

IP Quality of Service Modules                      tswtclmt(7ipp)



NAME
     tswtclmt - Time Sliding Window Three Conformance Level Meter

DESCRIPTION
     The  Time  Sliding  Window  Three  Conformance  level  meter
     (tswtcl)  meters a traffic stream and determines the confor-
     mance level of its packets.


     Packets are deemed to belong to one  of  the  three  levels,
     Red,  Yellow  or  Green, depending on the committed and peak
     rate.


     The meter  provides  an  estimate  of  the  running  average
     bandwidth. It takes into account burstiness and smoothes out
     its estimate to  approximate the longer-term measured  send-
     ing rate of the traffic  stream.


     The estimated bandwidth  approximates  the  running  average
     bandwidth of the traffic stream over a specific window (time
     interval). tswtcl estimates the average  bandwidth  using  a
     time-based  estimator.  When  a  packet arrives for a class,
     tswtcl re-computes the average rate by using the rate in the
     last  window  (time  interval)  and the size of the arriving
     packet. The window is then slid to start at the current time
     (the packet arrival time). If the computed rate is less than
     the committed configuration parameter, the packet is  deemed
     Green;  else  if  the rate is less than the peak rate, it is
     Yellow; else Red. To avoid dropping multiple packets  within
     a  TCP  window,  tswtcl probabilistically assigns one of the
     three conformance level to the packet.

  Statistics
     The tswtcl module exports global  and  per-class  statistics
     through kstat:


     Global statistics:

       module: tswtclmt                         instance: 
         name: tswtclmt statistics              class 
               green_bits                      
               green_packets                   
               red_bits                        
               red_packets                     
               yellow_bits                     
               yellow_packets                  






SunOS 5.11          Last change: 12 Apr 2010                    1






IP Quality of Service Modules                      tswtclmt(7ipp)



ATTRIBUTES
     See attributes(5) for descriptions of the  following  attri-
     butes:



     __________________________________________________________________
    |       ATTRIBUTE TYPE        |          ATTRIBUTE VALUE          |
    |_____________________________|___________________________________|
    | Availability                | system/network/ipqos/ipqos-config |
    |_____________________________|___________________________________|


SEE ALSO
     ipqosconf(1M), dlcosmk(7ipp), dscpmk(7ipp),  flowacct(7ipp),
     ipqos(7ipp), ipgpc(7ipp), tokenmt(7ipp)


     RFC 2859, A Time Sliding Window Three Color Marker  (TSWTCM)
     W. Fang, N. Seddigh, B. Nandy, The Internet Society, 2000.



































SunOS 5.11          Last change: 12 Apr 2010                    2