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Re: [trill] [sfc] Fwd: Mail regarding draft-ietf-trill-over-ip

"Templin, Fred L" <Fred.L.Templin@boeing.com> Wed, 06 May 2015 14:37 UTC

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From: "Templin, Fred L" <Fred.L.Templin@boeing.com>
To: Joe Touch <touch@isi.edu>, Dave Dolson <ddolson@sandvine.com>, Xuxiaohu <xuxiaohu@huawei.com>, Donald Eastlake <d3e3e3@gmail.com>, "trill@ietf.org" <trill@ietf.org>
Thread-Topic: [trill] [sfc] Fwd: Mail regarding draft-ietf-trill-over-ip
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Date: Wed, 06 May 2015 14:37:00 +0000
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Subject: Re: [trill] [sfc] Fwd: Mail regarding draft-ietf-trill-over-ip
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Hi Joe,

> -----Original Message-----
> From: Joe Touch [mailto:touch@isi.edu]
> Sent: Tuesday, May 05, 2015 5:28 PM
> To: Templin, Fred L; Dave Dolson; Xuxiaohu; Donald Eastlake; trill@ietf.org
> Cc: nvo3@ietf.org; int-area@ietf.org; sfc@ietf.org
> Subject: Re: [trill] [sfc] Fwd: Mail regarding draft-ietf-trill-over-ip
> 
> 
> 
> On 5/5/2015 3:43 PM, Templin, Fred L wrote:
> >> Then what you're saying is that the tunnel ingress - as an app - has
> >> > flows that are distinguishable by the net. That can happen with any
> >> > application.
> >
> > But, that's just it - when the original source does the probing the data
> > packets are always part of the same application - always. When the
> > tunnel ingress probes, it may be asked to encapsulate the data
> > pacekts of many applications.
> 
> An "application" is a source of packets.
> 
> At a tunnel, the ingress arriving packets are that source - they ARE the
> "application".
> 
> To correlate flow IDs to behavior within that flow - i.e., to the user
> programs that generate the packets that arrive at the ingress - requires
> the ingress to somehow infer those flows, unless they're explicitly
> marked by the user applications.
> 
> That's a known limitation of any tunnel ingress. It's equally true of
> the user application if there are four people using one application, and
> you want 'flow' to map back to an individual person.

We are still not reaching. The concern is that if some tunneled packets
take a different network path than others then there is a chance that
the probes will take a different path than the data. The only way I know
to prevent that is to always set the Flow Label in the encapsulation
header to some fixed value (e.g., 0).

Thanks - Fred
fred.l.templin@boeing.com

> Joe

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