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

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Fri, 19 October 2018 13:20 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: Toerless Eckert <tte@cs.fau.de>
CC: Carsten Bormann <cabo@tzi.org>, "roll-bier-dt@ietf.org" <roll-bier-dt@ietf.org>
Thread-Topic: [Roll-bier-dt] roll-bier-dt
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Subject: Re: [Roll-bier-dt] roll-bier-dt
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Sure, but the mystery to me is what goes transported with BIER.
Because that is the heart of the problem we are facing in this DT.
If BIER transports a same IP packet to multiple destinations, then they must all accept the same packet.
Moreover, if the destination is not the router indicated by the bit but a neighbor or a set of neighbors to that router, then the inner packet must indicate that.
All in all, that tells me that the transported packet is IP multicast.

What do I miss?

Take care,

Pascal

> -----Original Message-----
> From: Toerless Eckert <tte@cs.fau.de>
> Sent: vendredi 19 octobre 2018 15:14
> To: Pascal Thubert (pthubert) <pthubert@cisco.com>
> Cc: Carsten Bormann <cabo@tzi.org>rg>; roll-bier-dt@ietf.org
> Subject: Re: [Roll-bier-dt] roll-bier-dt
> 
> 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/note
> > > > > s/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
> > >
> > > _______________________________________________
> > > Roll-bier-dt mailing list
> > > Roll-bier-dt@ietf.org
> > > https://www.ietf.org/mailman/listinfo/roll-bier-dt
> 
> --
> ---
> tte@cs.fau.de