Re: [CCAMP] [Teas] Decision point on scope of draft-ietf-teas-ietf-network-slices

Hi Igor,

I am not sure I fully understand what do you mean with “top-down” versus “bottom-up”

However, after having read the “creating VNs on the fly”, I have got the feeling that with “bottom-up” you are considering the cases where the connectivity is setup a-priori before receiving any request from the customer while with “top-down” you are considering the cases where the connectivity is setup “on-demand” based on a request received from the consumer

Could you please confirm/correct my understanding?

Thanks, Italo

From: Igor Bryskin [mailto:i_bryskin@yahoo.com]
Sent: giovedì 10 marzo 2022 01:47
To: adrian@olddog.co.uk; Adrian Farrel <adrian@olddog.co.uk>; 'Daniele Ceccarelli' <daniele.ceccarelli@ericsson.com>; 'TEAS WG' <teas@ietf.org>; 'CCAMP' <ccamp@ietf.org>
Subject: Re: [Teas] [CCAMP] Decision point on scope of draft-ietf-teas-ietf-network-slices

Hi Adrian,

In response to Igor’s series of emails:

  *   If a 5G RAN is supported over an OTN then the concept of an e2e slice requires that there is something that can be called a transport network slice supported by the OTN.
IB:. I think to achieve this it would take basic OTN service delivering non-IP client over p2p links, something OTN has been doing for decades.

  *   If the IETF Network Slicing Service YANG module is agnostic of the underlay network, then it should be possible for any network technology to have a go at supporting it.
IB: This includes not just OTN, of course,  but also flexE. microwave, OCh, physical fiber, lease line, PW and pretty much anything else that can deliver bits from A to B. To paraphrase my favorite Gert's question: what is not a transport slice according to the framework?

  *   If a vendor does not want to implement or an operator does not want to support slicing over an OTN, that is a free choice.
IB: of course.

  *   If the concept of slicing an OTN is no different from building a VN or a set of LSPs in that network, why is this whole thing a big deal?
IB: As one Austrian guy said  "sometimes a cigar is just a cigar" and should be called cigar, rather than, say, tobaco slice );
Yes, it is not big deal if we stick to VNs, which normally are bottom up network building constructs. But it could become a rather big deal if one tries to engage OTN directly in the top down netwrk slicing process by, for example, creating VNs on the fly.

Cheers,
Igor

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On Wed, Mar 9, 2022 at 12:01 PM, Adrian Farrel
<adrian@olddog.co.uk<mailto:adrian@olddog.co.uk>> wrote:
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