RE: IETF54- Informal discussion on BC Model for DS-TE

["Ash, Gerald R (Jerry), ALASO" <gash@att.com>]

Francois,

> > > I don't think it would make any sense to sacrifice (i) or (ii) just for the
> > > sake of not using preemption.

> >It is possible to achieve (i) and (ii) *without* using preemption (you 
> >don't have to 'sacrifice' anything).  For example, use of dynamic 
> >bandwidth reservation together with maximum allocation is one approach 
> >(such a 'BC model' has been used in large-scale applications for many years).

> Could you detail this BC model?

It's described already in http://www.ietf.org/internet-drafts/draft-ietf-tewg-qos-routing-04.txt.  More specifically, see Section 3.4.2 of ANNEX 3 (PDF version at http://www.research.att.com/~jrex/jerry/annex3-tewg-qos-routing-04.txt.pdf).  See also Section 3.3 for the description of dynamic bandwidth reservation and Section 3.9 for modeling results showing the effectiveness of the method.

I'll plan to write a short I-D focusing on the maximum allocation with reservation (MAR) BC model when I return from vacation (which I'm now on :-)

Thanks,
Jerry