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

[Aihua Guo <[e-mail]>]

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 <[e-mail]> 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 <[e-mail]>
> *Sent:* 14 January 2022 16:14
> *To:* Igor Bryskin <[e-mail]>; zhangfatai=
> [e-mail]; [e-mail]; 'CCAMP' <[e-mail]>
> *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 <[e-mail]> *On Behalf Of *Igor Bryskin
> *Sent:* den 14 januari 2022 09:34
> *To:* zhangfatai=[e-mail]; Fatai Zhang <
> zhangfatai=[e-mail]>; [e-mail]; 'Fatai
> Zhang' <zhangfatai=[e-mail]>; 'CCAMP' <[e-mail]>
> *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=[e-mail]> wrote:
>
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