Re: [Bier] Comment on BIER-TE

Greg:

I think that the use-cases for BIER-TE are pretty clear:
It is at least the same ones as the ones SR has for steering traffic,
just for multicast traffic. On top of it, it also allows easy
controller define live-live multicast without having to bring in
complex new routing protocol like MRT into the network (live-live
is rarely a unicast requirement, so this is where multicast
requirements will be more than typical unicast).

The goals of the designs are also clear: It is designed to provide an 
evolution from RSVP-TE/P2MP for multicast with the same goals as the
evolution from RSVP-TE/P2P to SR. Aka: like SR for unicast, it provides
for multicast traffic engineering in a comparable lightweight 
signaling and state fashion as SR using the principle concepts of
BIER and expanding its architecture.

Of coure, SR is now a more inclusive framework also supporting other
functions, but i am not relating to those.

If any of this is not clear enough to you from the current draft
text, i am happy to improve this according to above text or more
detailed. Pls. let me know.

Cheers
    Toerless

On Wed, Aug 09, 2017 at 12:29:15PM -0700, Greg Mirsky wrote:
> Hi Toerless, Ice, et. al,
> I think that we arrived to realization that it may be helpful first to
> formulate the problem, requirements towards TE at BIER layer, if any.
> 
> Ice,
> we may have slightly different terminology in using 'topology', but you've
> captured my message - traffic engineering, as well as protection, may be
> better achieved in BIER's underlay, i.e. transport network. And segment
> routing with MPLS dataplane may fit the bill. Whether one uses distributed
> control plane or central controller, e.g. PCE - secondary issue.
> 
> Regards,
> Greg
> 
> On Wed, Aug 9, 2017 at 11:51 AM, IJsbrand Wijnands <ice@cisco.com> wrote:
> 
> > Toerless,
> >
> > > Now if you want to use traffic-engineering ("path engineering")
> > > to do steiner trees, IGP topologies will not help. If you want
> > > to do N-path load-splitting, you need N topologies, etc. pp.
> > > "Your mileage will vary" ;-)
> >
> > https://en.wikipedia.org/wiki/Wikipedia:Solutions_looking_for_a_problem
> >
> > :-)
> >
> > Thx,
> >
> > Ice.
> >
> > _______________________________________________
> > BIER mailing list
> > BIER@ietf.org
> > https://www.ietf.org/mailman/listinfo/bier
> >

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