Re: [CCAMP] 答复: WG adoption poll on draft-zheng-ccamp-yang-otn-slicing-03

I support WG Adoption.

I did have some questions and thankfully Aihua has answered mine as well.

Regards

Gyan

On Fri, Jan 14, 2022 at 5:20 PM Aihua Guo <aihuaguo.ietf@gmail.com> wrote:

> Hi Adrian, Daniele and Igor,
>
> IMHO an OTN slice, like an IETF network slice, is used to represent an
> intent from a (internal or external) customer's view. This intent includes
> a combination of resource requirements which can be expressed by
> connectivities or topologies, along with the common and OTN
> technology-specific SLOs. Customers usually do not care how an OTN slice is
> realized at the control plane and/or data plane, and VPN is one of the
> possible realizations.
>
> To summarize, an L1VPN with QoS parameters can be considered as a possible
> realization of an OTN slice.
>
> Also, if I understand it correctly, L1VPN is implemented using the control
> plane per rfc4878 and is not targeted as an NBI model.
>
> Thanks,
> Aihua
>
> On Fri, Jan 14, 2022 at 11:57 AM Adrian Farrel <adrian@olddog.co.uk>
> wrote:
>
>> I think there is a difference between a L3/L2 VPN and a L1VPN that is to
>> do with the nature of connectivity in the underlying network. A packet VPN
>> is expressed as a set of edge points and the edge connectivity capacities,
>> but not the edge-to-edge capacities. A L1VPN (at least for some L1
>> technologies – but not all?) has to be expressed in terms of edge-to-edge
>> capacities because you cannot do “on-demand” traffic routing within the
>> network – the flow markings are at a macro level.
>>
>>
>>
>> From that perspective, I’d agree that L1VPN is close to L1 slicing. It
>> would be good to hear the authors spell out the differences that they
>> obviously have in mind.
>>
>>
>>
>> But, not only did Daniele ask his question in TEAS, he also go an answer
>> 😊. There are service models in which a network slice may look like a
>> “VPN with QoS” – those are the enhanced VPN cases. But there are also
>> service models where the edge-to-edge flows are spelled out in more detail
>> than in a VPN.
>>
>>
>>
>> Ciao,
>>
>> Adrian
>>
>>
>>
>> *From:* Daniele Ceccarelli <daniele.ceccarelli@ericsson.com>
>> *Sent:* 14 January 2022 16:14
>> *To:* Igor Bryskin <i_bryskin@yahoo.com>; zhangfatai=
>> 40huawei.com@dmarc.ietf.org; adrian@olddog.co.uk; 'CCAMP' <ccamp@ietf.org
>> >
>> *Subject:* RE: [CCAMP] 答复: WG adoption poll on
>> draft-zheng-ccamp-yang-otn-slicing-03
>>
>>
>>
>> Indeed a very good question…which is similar to the more generic question
>> of what is the difference between a LxVPN with QoS (e.g a L3VPN bound to a
>> TE tunnel) and a slice which I tried to ask in TEAS (but that’s a different
>> story).
>>
>> Let’s focus on the difference between L1VPN and OTN slice here.
>>
>>
>>
>> BR
>> Daniele
>>
>>
>>
>> *From:* CCAMP <ccamp-bounces@ietf.org> *On Behalf Of *Igor Bryskin
>> *Sent:* den 14 januari 2022 09:34
>> *To:* zhangfatai=40huawei.com@dmarc.ietf.org; Fatai Zhang <
>> zhangfatai=40huawei.com@dmarc.ietf.org>; adrian@olddog.co.uk; 'Fatai
>> Zhang' <zhangfatai=40huawei.com@dmarc.ietf.org>; 'CCAMP' <ccamp@ietf.org>
>> *Subject:* Re: [CCAMP] 答复: WG adoption poll on
>> draft-zheng-ccamp-yang-otn-slicing-03
>>
>>
>>
>> Hi Fatai,
>>
>>
>>
>> I like that you and Adrian like my style, but I did ask questions before
>> the last IETF. The basic one is this:
>>
>> When I explain my wife what IETF network slice is, I say: Remember, we
>> have this thing called IP VPN?  Network slice is roughly IP VPN with QOS
>> parameters.
>>
>>
>>
>> Considering that L1VPN cannot be without QOS, my question to the authors
>> what is the difference between L1VPN and OTN slice?
>>
>>
>>
>> Cheers,
>>
>> Igor
>>
>> Sent from Yahoo Mail on Android
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>>
>>
>>
>> On Fri, Jan 14, 2022 at 2:00 AM, Fatai Zhang
>>
>> <zhangfatai=40huawei.com@dmarc.ietf.org> wrote:
>>
>> _______________________________________________
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>>
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