Re: [sfc] is current SFC architecture supporting different types of SFC header formats?

To reinforce Carlos' point, the architecture document is quite careful 
not to specify how the required information is encoded in the header. 
It is up to the WG to select a single such encapsulation that meets the 
requirements from among the multiple choices being presented in 
individual drafts.

Yours,
Joel

On 12/4/14, 10:18 AM, Carlos Pignataro (cpignata) wrote:
> Hi Georgios,
>
> Please see inline.
>
>> On Dec 4, 2014, at 9:40 AM, Georgios Karagiannis <georgios.karagiannis@huawei.com> wrote:
>>
>> Hi Carlos,
>>
>> Please note that I do not mean to use different SFC encapsulations simultaneously.
>>
>
> Thanks for the clarification.
>
>>  From what I understood from IETF'91 meeting discussions, the Generic SFC encapsulation technique has not yet been selected by the SFC WG.
>>
>> I think that this means that the SFC architecture draft cannot be in favor for one specific
>> SFC encapsulation technique and at the same time excluding other techniques.
>>
>
> Yes. Again, the SFC architecture document does not concern itself or take any position on any specifics for any encapsulation format. It does specify the functions that the SFC encapsulation need to fulfill.
>
>> My question is:
>>
>> Can the following two SFC encapsulation techniques be supported by the functions described in the SFC architecture draft?:
>>
>> o) Single Marking Code Point, like format, see section 5.1 on boucadair draft, see below.
>>
>> o) Explicit Route List, like format, see section 5.3 on boucadair draft, see below.
>>
>
> I see — this is a question for draft-boucadair-sfc-design-analysis and not for draft-ietf-sfc-architecture. Meaning, it would be up to the proposed encapsulation to show how they realize the functions of the architecture.
>
> That said, I do not see an “SF Map Index” in the architecture document, for example.
>
> Thanks,
>
> Carlos.
>
>> http://www.ietf.org/id/draft-boucadair-sfc-design-analysis-03.txt
>>
>> Best regards,
>> Georgios
>>
>>
>>
>>
>>> -----Original Message-----
>>> From: Carlos Pignataro (cpignata) [mailto:cpignata@cisco.com]
>>> Sent: Thursday, December 04, 2014 3:02 PM
>>> To: Georgios Karagiannis
>>> Cc: sfc@ietf.org
>>> Subject: Re: [sfc] is current SFC architecture supporting different types of
>>> SFC header formats?
>>>
>>> Hi, Georgios,
>>>
>>> Do you mean different SFC Encapsulations simultaneously? The SFC charter
>>> says:
>>>
>>> <snip>
>>> 3. Generic SFC Encapsulation: This document will describe a single
>>>    service-level data plane encapsulation format that:
>>>
>>> </snip>
>>>
>>> Because interoperability is the goal.
>>>
>>> Looking at that section, the terminology does not seem to align to the arch
>>> and problem-statement documents. Also, that section seems to describe a
>>> pseudo-format, not a format. The architecture describes the functions in
>>> Section 4.1 and other places.
>>>
>>> Thanks,
>>>
>>> Carlos.
>>>
>>> On 12/4/14, 8:55 AM, "Georgios Karagiannis"
>>> <georgios.karagiannis@huawei.com> wrote:
>>>
>>>> Hi Carlos,
>>>>
>>>> Thanks for your answer!
>>>>
>>>> Does this mean that the SFC architecture is allowing the use of
>>>> different Service Function Chaining Header (SFC encapsulation) formats?
>>>>
>>>> I am referring to the different SFC encapsulation formats that are
>>>> discussed in section 5 of the following ID:
>>>> http://www.ietf.org/id/draft-boucadair-sfc-design-analysis-03.txt
>>>>
>>>> Best regards,
>>>> Georgios
>>>>
>>>>
>>>>> -----Original Message-----
>>>>> From: Carlos Pignataro (cpignata) [mailto:cpignata@cisco.com]
>>>>> Sent: Thursday, December 04, 2014 2:46 PM
>>>>> To: Georgios Karagiannis
>>>>> Cc: sfc@ietf.org
>>>>> Subject: Re: [sfc] is current SFC architecture supporting different
>>>>> types of  SFC header formats?
>>>>>
>>>>> Hi, Georgios,
>>>>>
>>>>> The SFC architecture document concerns itself with the functions and
>>>>> not the  format.
>>>>>
>>>>> Thanks,
>>>>>
>>>>> Carlos.
>>>>>
>>>>>> On Dec 4, 2014, at 5:17 AM, Georgios Karagiannis
>>>>> <georgios.karagiannis@huawei.com> wrote:
>>>>>>
>>>>>> Hi all,
>>>>>>
>>>>>> Please note that I was reviewing the SFC architecture draft, see
>>>>> below, and
>>>>> I have a question:
>>>>>> http://www.ietf.org/id/draft-ietf-sfc-architecture-02.txt
>>>>>>
>>>>>>
>>>>>> Can you please let me know if the current version of the SFC
>>>>>> architecture allows the use of different Service Function Chaining
>>>>> Header
>>>>> formats?
>>>>>>
>>>>>> These formats and their analysis can be found in Section 5 of the
>>>>> following
>>>>> draft:
>>>>>>
>>>>>> http://www.ietf.org/id/draft-boucadair-sfc-design-analysis-03.txt
>>>>>>
>>>>>>
>>>>>> If that is not the case, please elaborate why.
>>>>>>
>>>>>> Best regards,
>>>>>> Georgios
>>>>>>
>>>>>>
>>>>>> _______________________________________________
>>>>>> sfc mailing list
>>>>>> sfc@ietf.org
>>>>>> https://www.ietf.org/mailman/listinfo/sfc
>>>>
>>
>
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