Re: [Roll-bier-dt] roll-bier-dt

Toerless Eckert <tte@cs.fau.de> Fri, 19 October 2018 13:14 UTC

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Date: Fri, 19 Oct 2018 15:14:12 +0200
From: Toerless Eckert <tte@cs.fau.de>
To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
Cc: Carsten Bormann <cabo@tzi.org>, "roll-bier-dt@ietf.org" <roll-bier-dt@ietf.org>
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Subject: Re: [Roll-bier-dt] roll-bier-dt
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On Fri, Oct 19, 2018 at 12:36:06PM +0000, Pascal Thubert (pthubert) wrote:
> Hello Toerless:
> 
> Well, there is as Carsten says a multicast support for RPL storing mode, but not for non-storing. This is where Carsten's draft comes in to play.

Sure. As said, i may not have correctly captured what Mcr was explaining,

> In normal BIER, the bits indicate the routers, don't they? So there's an IP packet inside, correct, like in my tunnel mode? But then I expect it is the same packet for all destinations. So how does htat work, is it a mcast packet or do all the destination have a same IP address?

"Proper BIER" (TM) (the stuff done by BIER-WG) has defined its own
encapsulation header (RFC8296) that sits on top of MPLS or ethernet and
that has its own next-proto field/registry, so it can be followed
by IP or anything else that BIER-WG feels deserves a code point in
that registry.

Cheers
    Toerless

> Pascal
> 
> > -----Original Message-----
> > From: Roll-bier-dt <roll-bier-dt-bounces@ietf.org> On Behalf Of Toerless Eckert
> > Sent: vendredi 19 octobre 2018 14:21
> > To: Carsten Bormann <cabo@tzi.org>
> > Cc: roll-bier-dt@ietf.org
> > Subject: Re: [Roll-bier-dt] roll-bier-dt
> > 
> > That was me taking notes what Michael said, and maybe i didn't transcribe it
> > correctly. Hope Michael is subscribed here to answer.
> > 
> > I think i was more wondering about the suport of compressed IP multicast
> > headders in 6LowPan because that is unclear to me and we probably need to
> > take one of the DT meetings to detail more what extensions we need to do for
> > 6LowPan to support BIER.
> > 
> > Cheers
> >     Toerless
> > 
> > On Fri, Oct 19, 2018 at 07:45:50AM +0200, Carsten Bormann wrote:
> > > On Oct 19, 2018, at 04:56, Toerless Eckert <tte@cs.fau.de> wrote:
> > > >
> > > > https://raw.githubusercontent.com/toerless/roll-bier/master/notes/18
> > > > 1017-roll-bier-notes.txt
> > >
> > > What do you mean with ???RPL does not support multicast.????  MOP=3?
> > > (That is of course storing mode only, and storing mode doesn???t exist :-), so
> > you have a point.
> > > That???s why we did ccast, to fill in multicast for non-storing mode.)
> > >
> > > Grüße, Carsten
> > 
> > --
> > ---
> > tte@cs.fau.de
> > 
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> > Roll-bier-dt@ietf.org
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