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Overview

CPS stores the yang model of the mounted devices in CPS-Core database. It is handled by CPS-DMI Plugin which fetches the yang models of the devices registered at AAI and stores in CPS.

As the VNF/PNF registry in AAI is not supported for Slicing use case, the mounted nodes will be directly published to the CPS-DMI Plugin by SDN-C.

A new karaf feature is needed to communicate the node-id to CPS-DMI plugin. This will be achieved by registering a cm-handle with DMI-Plugin.

RPC Details

RPC Name: addCMHandle

Functionality:

  1. This RPC makes use of the onDataTreeChanged event from DataTreeChangeListener to detect, if any node is added to network-topology https://localhost:8086/restconf/config/network-topology:network-topology

  2. If the ModificationType is 'WRITE', a new notification is published to dmaap to add the cmhandle.

  3. If the ModificationType is 'DELETE', the notification to remove the cmhandle will be published. - TBC with CPS Team

       cmhandle format:

      

       Reference: CPS-352 : Create yang-model for DMI-registry data

       where,

       cm-handle-id is node id

       dmi-service-name is Kubernetes service name of the DMI Plugin


RPC Yang: CMHandle-API.yang

yang tree:


Yang-model Discovery  


Interfaces:

  1. Mount Request to SDN-R
<node xmlns="urn:TBD:params:xml:ns:yang:network-topology"> 
<node-id>new-netconf-device id</node-id> 
<host xmlns="urn:opendaylight:netconf-node-topology">127.0.0.1</host> 
<port xmlns="urn:opendaylight:netconf-node-topology">17830</port> 
<username xmlns="urn:opendaylight:netconf-node-topology">admin</username> 
<password xmlns="urn:opendaylight:netconf-node-topology">admin</password> 
<tcp-only xmlns="urn:opendaylight:netconf-node-topology">false</tcp-only> 
</node>

     2. New Feature at SDN-R to publish the cm-handle

      feature: addCMHandle

      Dmaap Topic: CM_HANDLE (TBC)

    3. Receive the DMaap notification

      curl -k --header "Content-Type: application/json" --request GET https://<ip>:30226/events/CM_HANDLE

    4 & 5. Fetch the module sets and yang model from SDN-R using RESTConf API (CPS-DMI Plugin takes care of it)

       Yang model: https://<ip>:<port>/restconf/operations/network-topology:network-topology/topology/topology-netconf/node/{node-id}/yang-ext:mount/ietf-netconf-monitoring:get-schema

       Initial-config data:

       DMI Plugin should be able to fetch the initial RAN Configuration data as well (not shown in the sequence diagram).

      https://<ip>:<port>/restconf/config/network-topology:network-topology/topology/topology-netconf/node/{node-id}/yang-ext:mount/ran-network:ran-network

Discussion with CPS Team on 28-09-2021:


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