Hi Uma, The comments are inlined. Reza
From: Teas <[email protected]> on behalf of Uma Chunduri <[email protected]> Date: Thursday, February 11, 2021 at 7:26 PM To: TEAS WG <[email protected]> Cc: dmm <[email protected]> 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>], NAT64 [RFC6146<https://tools.ietf.org/html/rfc6146>], 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.
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