The MPLS WG Archive

[David Charlap <David.Charlap@marconi.com>]

Vasanthi Thirumalai wrote:
> 
> I responded once before on this issue and my feeling is that it is
> Peak data rate. But someone on the list disagreed. I guess it also
> depends to a large extent on the type of the system. For instance
> on an optical system, you may have a choice of dicrete bandwdths
> to choose from - say OC-12, OC-48 or OC-192. In such a case the
> peak data rate seems more appropriate.

If you're on a network where there is no room for fuzziness in your
request, then it's not a big deal to generate a TSPEC where r == p.

As I wrote in response to Julia's message, IntServ objects do not define
a single "bandwidth" parameter.  Instead, they define 3 (5 for
guaranteed service) parameters which are used to define a specific
queueing algorithm.

If your hardware does not support this queueing model, then the
parameters must be massaged to fit what your hardware does support. 
There is no generalized way to do this.  The "right thing" will depend
on what your hardware's queueing model is.

-- David