Cell Relay Archive[Date Prev][Date Next][Thread Prev][Thread Next] [Date Index][Thread Index][Author Index][Subject Index] Re: Traffic Class and Scheduling Algorithm(s)
In article <396527E2.C112D498@mediaone.net>, cambria@world.std.com wrote: > (...) > Is there a discription of what cell scheduling algorithm(s) can be used > with various traffic classes? > > Is this even a valid question (e.g. if cells for different VCs, each > using a different traffic class (CBR, UBR, VBR-rt etc.) are being sent > out the same port, intuition tells me that the same algorithm would be > used, perhaps with different prameters. >(...) > Any help appriciated. > > Thanks, > MikeC > Hi, your intuition is right. The ATMF-specification TM 4.1 recommends the implementation of either a virtual scheduling algorithm or a leaky bucket algorithm at the network entrance as a generic cell rate algorithm. Either works with a pair of parameters. Fed with SCR and MBS (precisely: the derived Burst Tolerance) they check if the max burst size is exceeded. Fed with PCR and CDVT maintenance of the PCR is surveyed. Non compliant cells are discarded or CLP-tagged depending on the selected conformance definition. You may wish to look at http://www.atmforum.com/atmforum/specs/ approved.html and there Traffic Management (af-tm-0121.000) page 23 for details. Thomas Frieling (These are all my opinions and they do not necessarily match those of my employer.) Sent via Deja.com http://www.deja.com/ Before you buy.
|
|