Re: [Rtg-dt-encap-considerations] Proliferation of encapsulations ...

Erik Nordmark <nordmark@sonic.net> Thu, 21 May 2015 18:42 UTC

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Date: Thu, 21 May 2015 11:42:12 -0700
From: Erik Nordmark <nordmark@sonic.net>
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To: "Larry Kreeger (kreeger)" <kreeger@cisco.com>, "rtg-dt-encap-considerations@ietf.org" <Rtg-dt-encap-considerations@ietf.org>
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Subject: Re: [Rtg-dt-encap-considerations] Proliferation of encapsulations ...
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On 5/21/15 11:25 AM, Larry Kreeger (kreeger) wrote:
> The reason I was asking for examples was to understand whether it really
> was a separate encapsulation layer (e.g. GRE) versus just running directly
> over IP or Ethernet without and encapsulation (e.g. IP-in-IP).  Since you
> named both, then further clarification in the text might be needed to
> cover both cases (direct encapsulation and encapsulation using an
> additional header).
Those aspects matter if/when there is a push to get either more 
commonality and less different encapsulations, or extensibility 
mechanisms for such encapsulations.

But I chose the wording to stay away from such possibilities to avoid 
writing an essay on differences and similarities for different styles of 
encapsulations.

If we later end with some "Architectural considerations re: the 
profileration of encapsulations" then such a document would go into more 
detail.

    Erik

>
>   - Larry
>
> On 5/21/15 11:18 AM, "Erik Nordmark" <nordmark@sonic.net> wrote:
>
>> On 5/21/15 10:23 AM, Larry Kreeger (kreeger) wrote:
>>> Hi Erik,
>>>
>>> Where you wrote "where there might already exist an encapsulation over
>>> IP
>>> or Ethernet." do you think it would be useful to name a couple of
>>> examples?  e.g. are you referring to GRE or something else?
>> GRE, but also IP-in-IP.
>> I'm a but concerned having examples in the document since it might be
>> interpreted as those proposals/proponents doing something wrong. Such as
>> misinterpretation would make it harder to do something cooperative down
>> the road.
>>
>>     Erik
>>
>>>    - Larry
>>>
>>> On 5/21/15 10:12 AM, "Erik Nordmark" <nordmark@sonic.net> wrote:
>>>
>>>> Based on our discussion I propose adding this text to the scope
>>>> section:
>>>>
>>>> "While the origin and focus of this document is the routing area and in
>>>> particular NVO3, SFC, and BIER, the considerations apply to other
>>>> encapsulations that are being defined in the IETF and elsewhere. There
>>>> seems to be an increase in the number of encapsulations being defined
>>>> to
>>>> run over UDP, where there might already exist an encapsulation over IP
>>>> or Ethernet. Feedback on how these considerations apply in those
>>>> contexts is welcome."
>>>> Comments?
>>>>
>>>>
>>>> Once that is in place and the document is out I'll send a note to the
>>>> IESG to raise awareness.
>>>> In that note I'll include any examples we have. Is there something
>>>> other
>>>> than draft-xu-softwire-ip-in-udp and draft-ietf-trill-over-ip that we
>>>> should use as examples?
>>>>
>>>> Based on how that goes I'll raise the "profileration of encapsulations"
>>>> with the IAB later.
>>>>
>>>> Thanks,
>>>>      Erik
>>>>
>>>>
>>>>
>>>> _______________________________________________
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>