VNF business process-study notes (4)

NSD management and NS life cycle management flow

NSD management process

1. The initiator initiates an NSD registration request.
2. After receiving the registration request, NFVO verifies the legitimacy of the NSD, such as:

a. Verify the existence of the VNF package of the VNF referenced in the NSD

b. Verify the existence of required elements

     3.NFVO stores the NSD into the directory.

     4.NFVO notifies the initiator that the NSD upload is successful.

NSD update process

1. The initiator initiates an NSD update request and submits the modified NSD to NFVO;
2. After receiving the NSD update request, NFVO verifies the existence and legality of the NSD, and checks whether the NSD is waiting to be deleted;
3. After passing the above check, NFVO notifies the directory to save a new version of NSD.
4. NFVO notifies the initiator that the NSD update is successful

NSD query process

1. The initiating party requests NFVO to query the NSD, including the conditions that the NSD needs to meet;
2. NFVO queries the directory for NSDs that meet the conditions and obtains NSD information;
3. NFVO feedbacks the queried NSD information to the initiator

NSD removal process

1. The initiator requests NFVO to delete the NSD;
2. NFVO checks and verifies the NSD deletion request, including checking whether the sender has permission, whether the NSD to be deleted exists, whether the NSD status is disabled, etc.;
3. After the verification is passed, NFVO notifies the directory to delete the NSD information;
4. NFVO reports the deleted NSD information to the initiator

NS instantiation process

First create the NSID identifier;

1) The initiator sends a request to instantiate a new network service to NFVO, carrying the NSID identifier;

2) After receiving the request, NFVO verifies the request: including operator permission verification and parameter verification;

3) NFVO verifies the feasibility of VNF instantiation (VNF Check Feasibility) to VNFM;

4) VNFM returns the verification result;

5-7) NFVO obtains the corresponding NSD based on the NSID, requests VIM to create a network connection based on the VNFFG associated with the NSD, and returns the execution result;

8) NFVO initiates VNF instantiation based on the VNF involved in the NSD;

9-11) NFVO notifies VIM to connect all VNFs to the network and returns the execution results;

12-13) NFVO connects VNF to external PNF through NMS and returns execution results;

14)NFVO returns the network service instantiation result