Re: [Teas] draft-ietf-teas-ietf-network-slice-definition-00

"Rokui, Reza (Nokia - CA/Ottawa)" <reza.rokui@nokia.com> Fri, 12 February 2021 14:46 UTC

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From: "Rokui, Reza (Nokia - CA/Ottawa)" <reza.rokui@nokia.com>
To: Uma Chunduri <umac.ietf@gmail.com>, TEAS WG <teas@ietf.org>
CC: dmm <dmm@ietf.org>
Thread-Topic: [Teas] draft-ietf-teas-ietf-network-slice-definition-00
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Date: Fri, 12 Feb 2021 14:46:48 +0000
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Subject: Re: [Teas] draft-ietf-teas-ietf-network-slice-definition-00
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Hi Uma,
The comments are inlined.

Reza



From: Teas <teas-bounces@ietf.org> on behalf of Uma Chunduri <umac.ietf@gmail.com>
Date: Thursday, February 11, 2021 at 7:26 PM
To: TEAS WG <teas@ietf.org>
Cc: dmm <dmm@ietf.org>
Subject: [Teas] draft-ietf-teas-ietf-network-slice-definition-00

Dear All,

2 questions on this draft:

1.
Section 4.2 defines 'IETF Network Slice endpoints'

It Says -

" o They are conceptual points of connection of a consumer network,

      network function, device, or application to the IETF network

      slice.  This might include routers, switches, firewalls, WAN,

      4G/5G RAN nodes, 4G/5G Core nodes, application acceleration, Deep

      Packet Inspection (DPI), server load balancers, NAT44 [RFC3022<https://tools.ietf.org/html/rfc3022>]2>],

      NAT64 [RFC6146<https://tools.ietf.org/html/rfc6146>]6>], HTTP header enrichment functions, and TCP

      optimizers."





I presume 4G/5G RAN nodes, you meant eNB, gNB-DU, gNB-CU-UP etc. If yes,

there was a question from one of the 3GPP delegates on how this can be called as

'IETF Network Slice Endpoint'?



[Reza] Yes 4G/5G RAN nodes means eNB, gNB-DU, gNB-CU-UP etc. However, the fundamental aspect to be considered for IETF Network Slice is that it is technology-agonistic.

Note that also that RAN nodes for example have two logical components; Radio components and transport component. The IETF Network Slice addresses the connectivity from Transport component of RAN (which in today’s technology it is the data-path) to other endpoints. It is called 'IETF Network Slice Endpoint' because user’s traffic starts from this entry point.



I guess, we ought to be cognizant when we tag 'IETF' for some of

these definitions.



The above also mentions 4G/5G Core nodes aka SGW/PGW/all-variants-of-UPFs and

these are again not typically 'IETF Network Slice Endpoints'.

[Reza] As mentioned above the 'IETF Network Slice  and 'IETF Network Slice Endpoint are technology-agnostics. In draft these nodes are are called DAN (Device, Application, NF) which shows its true technology-agnostics.



Could you please give your thoughts here?

[Reza]



2.



Section 1 says



"IETF network slices are created and managed within the scope of one

   or more network technologies (e.g., IP, MPLS, optical). :





Obviously, optical is a bigger topic and if we talk about optical solutions like

OTN (Layer 1)  and SPN (Layer 1.5) are more controlled by other SDOs. SPN has

a complete slicing solution with not much bearing to IETF.



So, could you please expand 'optical' in the list above? Is it the  various optical control plane

specifications done here, you were referring to?



--

Uma C.