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ONF Liaison Statement


5 April 2018


Update on ONF OIMT OTCC work on modelling of the Controller

+ Reply to: SG15-LS112: LS on Initiation of approval of SDN Architecture Recommendations

+ Reply to: ZSM (18)000046r5: Formation of a new ETSI ISG for Zero Touch Network and Service Management



Nurit Sprecher ( )


ITU-T Study Group 15

Hing-Kam Lam: Rapporteur Q14/15 ( )

Scott Mansfield: Associate Rapporteur Q14/15 ( )

Stephen Shew: Rapporteur Q12/15 ( )



Nan Chen, President MEF ( )

Kevin Vachon, COO MEF ( )








Timon Sloane (ONF Vice President of Marketing and Ecosystem)



Reply to



Nigel Davis (OIMT Co-Chair)

Kam Lam (OIMT Co-Chair)

Lyndon Ong (OTCC Chair)


Dear colleagues,

SG15: Thank you for the information you provided in your liaison statement SG15-LS112. The statement and attachments have been considered in detail and it is clear that there are many areas where information exchange and potentially collaboration would be beneficial.

ZSM: Thank you again for the information you provided in your liaison statement ZSM(18)000046r5 dated 12 January. This liaison statement provides some updates on our response from 22 February.

The ONF OIMT (Open Information Model and Tooling) and OTCC (Open Transport Configuration and Control) projects are focussed on Operation Automation in a mixed technology context with the aim to automate operational processes runtime including design, deployment, monitoring and optimization. The primary focus of the work is representing the network and control systems using information models and generating, from those, interfaces/APIs that can be used between controllers, orchestrators and other devices related to the control of the services provided by the network and the control of the control system itself.

As a consequence, intertwined with this work is the construction of an architecture of the control system (built on earlier work in ONF TR-521 v1.1 ). In the this work automated management is considered to be control (i.e. the Management Control Continuum).

During the recent ONF interim meeting in London, 12 March – 16 March, there were discussions on various updates to the ONF Core Model. It was felt by the attendees that, in the context of your work, the modelling of the control system may be of particular interest.

An initial form of the Control System model is provided in ONF TR-512 v1.3.1-info (which is publicly available at ) but significant enhancements are proposed for V1.4 (due to be published Q2 2018).

The model includes a representation of:

  • The control function of the controller/device
  • The port through which communication to the control function is achieved
  • The view provided by the control function to the external controller etc.
  • A representation of the message structure used between the controllers

The adjustments/additions in 1.4 include:

  • Naming consistency
  • More uniform modelling of constraints
  • Emphasis of the “through-to-about” pattern
  • Tying up of the control model with the model of operations

The model work aligns well with the architecture described in ONF TR-521 v1.1 which emphasizes a recursion of control.

In addition, TR-512 model also covers other aspects of network control that may also be of interest including a representation of:

  • The detailed control element related to protection switching and restoration
  • Generalized processing functionality
  • The rules for the assembly of a system (scheme) of components that provide a particular function

Updates in the area mentioned above will be provided as work progresses. If there are any specific aspects that are of particular interest where your team need further clarity or there are aspects where work of your team that may provide further insight in this area to help ONF modelling progress, it would be appreciate if these could be detailed in a reply to this liaison statement.



Kam LAM, Co-Chair OIMT Project

Nigel Davis, Co-Chair OIMT Project

Lyndon Ong, Chair OTCC Project