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Re: [Detnet] Implementing the discussion at IETF 97 on architecture doc

Lou Berger <lberger@labn.net> Thu, 09 March 2017 14:12 UTC

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To: "Pascal Thubert (pthubert)" <pthubert@cisco.com>, "jouni.korhonen@broadcom.com" <jouni.korhonen@broadcom.com>, "detnet@ietf.org" <detnet@ietf.org>
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From: Lou Berger <lberger@labn.net>
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Date: Thu, 09 Mar 2017 09:12:31 -0500
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Cc: "draft-ietf-detnet-architecture@ietf.org" <draft-ietf-detnet-architecture@ietf.org>
Subject: Re: [Detnet] Implementing the discussion at IETF 97 on architecture doc
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Pascal,

    Another thing to consider bringing into the Architecture document
are some of the diagrams and related text from Section 3 of
draft-ietf-detnet-dp-alt.  I think the whole section, with the exception
of the last two paragraphs on page 5, is good text to bring over.  

Lou
(as contributor, co-author of dp-alt)

On 3/9/2017 3:06 AM, Pascal Thubert (pthubert) wrote:
> I agree, Jouni, 
>
> we seem to be placing the horses before the cart.
> Let us comment out that text for now.
>
> Take care,
>
> Pascal
>
> -----Original Message-----
> From: Jouni Korhonen [mailto:jouni.korhonen@broadcom.com] 
> Sent: mercredi 8 mars 2017 21:37
> To: Pascal Thubert (pthubert) <pthubert@cisco.com>; detnet@ietf.org
> Cc: draft-ietf-detnet-architecture-all@tools.ietf.org
> Subject: Re: [Detnet] Implementing the discussion at IETF 97 on architecture doc
>
> Hi,
>
> [snip]
>
>> 4.9.2.  Flow attribute mapping between layers
>>
>>
>>    Transport of DetNet flows over multiple technology domains may
>>    require that lower layers are aware of specific flows of higher
>>    layers.  Such an "exporting of flow identification" is needed each
>>    time when the forwarding paradigm is changed on the transport path
>>    (e.g., two LSRs are interconnected by a L2 bridged domain, etc.).
>>    The three main forwarding methods considered for deterministic
>>    networking are:
>>
>>    o  IP routing
>>
>>    o  MPLS label switching
>>
>>    o  Ethernet bridging
>>
>>    The simplest solution for generalized flow identification could be to
>>    define a unique Flow-ID triplet per DetNet flow (e.g., [IP: "IPv6-
>>    flow-label"+"IPv6-address"; MPLS: "PW-label"+"LSP-label"; Ethernet:
> The discussion on this part has not yet completed in DP design team. I am a bit worried writing this specific part down before we actually know how we are going to implement on the data plane. The above is not, as far as I understand, aligned with the DT progress. To get around the chicken-egg thing here either defer documenting for now or emphasize more that the above is an example.
>
> - Jouni
>
>>    "VLAN-ID"+"MAC-address").  This triplet can be used by the DetNet
>>    encoding function of technology border nodes (where forwarding
>>    paradigm changes) to adapt to capabilities of the next hop node.  It
>>    means that a packet may contain multiple (forwarding paradigm
>>    specific) Flow-IDs during its transport.  Technology border nodes may
>>    add / remove a (forwarding paradigm specific) Flow-ID.
> [snap]
>
>> What do you think?
>>
>>
>>
>> Pascal and Norm
>>
>>
>>
>> _______________________________________________
>> detnet mailing list
>> detnet@ietf.org
>> https://www.ietf.org/mailman/listinfo/detnet
>>
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