1. Scope and Approach of ONF OIMT Internet Protocol Work Items
oimt2019.KL _Scope&Approach-of-IP-WorkItems
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ONF OIMT & OTCC Sydney Joint Meeting
CICT-FiberHome Kam LAM、Xiang YUN

2. The IP modeling landscape
We recognize that
IETF is the body that owns the Internet Protocol (IP) forwarding technologies
In IETF the IP requirements and protocols are specified in RFCs or Working Group internet drafts (I-D) if not yet published as RFC
In IETF the data models are currently specified in YANG
In IETF there is no protocol-neutral information model. UML is not and will not be used for modeling.
In OIMT, currently there are two new work items related to IP technologies, namely
wi9 IP Switching
wi53 IP Routing
Before starting the modeling, we need to have consensus among ourselves on
The scope of the works
The relationship of the models to the IETF specifications, in particular the IETF YANG modules
The approach of modeling
The position of the wi9-UML and wi53-UML models with respect to the Core Model and TAPI model

3. IETF IP Routing YANGs YANG Github: https://github.com/YangModels/yang
Yang Module
Import types from Yang module
Augment to Yang module
Routing
ietf-interfaces, ietf-yang-types,
- -
Rtg ISIS
ietf-routing, ietf-inet-types, ietf-yang-types, ietf-interfaces, ietf-key-chain, ietf-routing-types, iana-routing-types, ietf-bfd-types
ietf-routing,
ietf-interfaces
Rtg BFD
ietf-bfd-types, ietf-routing
ietf-routing
Segment Routing (SR) *
(*draft-ietf-spring-sr-yang-12.pdf)
ietf-inet-types, ietf-routing, ietr-interfaces, ietf-routing-types, ietf-segment-routing-common
SR Common *
ietf-inet-types
BGP
ietf-routing-policy, ietf-bgp-types, ietf-inet-types, ietf-yang-types
BGP SR
Ietf-routing-types, ietf-inet-types, ietf-routing-policy, ietf-bgp, ietf-bgp-policy, ietf-bgp-types, ietf-srv6-types
ietf-bgp,
Ietf-routing-policy
YANG Github:
Note: There are SR related I-D draft-ietf-isis-segment-routing-extensions, draft-ietf-idr-bgp-ls-segment- routing-ext, & draft-ietf-pce-segment-routing. But no YANG has been defined yet.

4. OIMT IP Modeling approach
Map the IETF YANG modules into UML as IP UML models
These IP UML models form the base of IP-Technology-specific UML models
Similar position as the ITU-T transport-technology-specific base models G.875, G.8082, etc.
These IP-Technology-specific base UML models
Can be augmented with operator/vendor-specific features (e.g. to support 5G, ECC/DCN) by using the Spec approach
Pruning/refactoring as needed for API-specific applications, such as TAPI

5. OIMT WI-53 IP Routing (Segment Routing)
Purpose –IP Routing YANG mapping and assessment
Specifically
Map the IETF relevant YANG modules into UML
Assess how the IP UML model fit into (align with) the Core model
Includes – IP Routing YANG and relevant Segment Routing extension YANG
Excludes – Other routing protocols: ISIS, BGP, OSPF, BFD;
External Dependencies – IETF YANG modules specified in RFC and WG Internet Drafts
Assumptions – The IP-specific UML base model could be extended with operator/vender-specific features (e.g. for supporting 5G, ECC/DCN applications) using the Core Spec model approach. Model (not technology) pruning/refactoring could apply as needed for API-specific applications, such as TAPI
Risks – Should not change the base IP forwarding technology.

6. IP Switching? What is IP Switching? Wikipedia: Techopedia:
Cannot find a clear definition of IP Switching
Layer 3 switching in the context of multilayer switch (MLS)
MLS: A multilayer switch (MLS) is a computer networking device that switches on OSI layer 2 like an ordinary network switch and provides extra functions on higher OSI layers.
Layer 3 switching: Layer 3 switching is solely based on (destination) IP address stored in the header of IP datagram. The difference between a layer 3 switch and a router is the way the device is making the routing decision. Traditionally, routers use microprocessors to make forwarding decisions in software, while the switch performs only hardware-based packet switching.
Techopedia:
IP Switching is a routing technique which routes data packets faster than traditional routing by using Layer 3 Switches.
IP Switching is performed by implementing Layer 3 switches which employ ASIC hardware and transferring via ATM Switches. This speeds up the whole routing process. IP Switching establishes a virtual circuit in ATM switches whenever it needs to route packets that are high priority or packets that are destined for an external network.
IP Switching is also known as multi-layer switching because it performs Layer 3 based routing as well as Layer 2 switching.

7. OIMT WI-9 IP Switching
Long Description of WI-9 “IP switching” in oimt2018.KL _oimt-work-items.xlsx:
IP driven by requirements from ECC/DCN ensuring we have core support (IMP, OT, TAPI brigade
* Extending over time to “full” IP via appropriate collaboration and federation
Need better understanding on what to achieve
Purpose –
Specifically –
Includes –
Excludes –
External Dependencies –
Assumptions –
Risks –

8. THANKS! 