Page 525 - Cloud computing: From paradigm to operation

Cloud Computing management 2

Figure 7-1 – Illustration of NaaS-related metadata positions

Operation support system (OSS)-NaaS service catalogue functional components (see clause 8.3.1 of
[ITU-T Y.3515]) includes a listing of all cloud services of NaaS cloud service providers (CSPs) including the
relevant NaaS services. NaaS service data model, NaaS service operational policy data model and NaaS
resource data model are needed in this functional component for NaaS service instantiation.

The service capabilities (NaaS) functional component (see clause 8.2.3 of [ITU-T Y.3515]) in the service layer
provides capabilities exposed to the NaaS cloud service customer (CSC) according to the NaaS service data
model and NaaS service operational policy data model selected by the NaaS CSC through business level
interactions with the NaaS CSP.

7.1 NaaS service data model
The NaaS service data model (see clause 8.3.1 of [ITU-T Y.3515]) describes the specific network service based
on the characteristic of the service that can be used for service delivery, e.g., L3VPN and L2VPN data models
under development of the working groups L3SM [b-L3SM] and L2SM [b-L2SM] of IETF.

7.2 NaaS service operational policy data model
The NaaS service operational policy data model (see clause 8.3.1 of [ITU-T Y.3515]) describe high-level
network-wide polices for a given NaaS service, which can be input into the network management function
(within a software-defined networking (SDN) controller, an orchestrator, or a network element), and
combined with the NaaS service data model and mapped into a target configuration of network elements,
e.g., generic policy data model described in [b-SUPA] of IETF. The network management function can control
the configuration and monitor the network elements and services according to such policies.

7.3 NaaS resource data model
The NaaS resource data model (see clause 8.3.1 of [ITU-T Y.3515]) describes topology of NaaS CSP's resources
across different layers and reflects the attributes and operational parameters of given NaaS resources
(e.g., network services (NSs), NFs, virtualised resources, physical resources).

7.4 Relationship among metadata in NaaS service
The NaaS service operational policy data model can manage and adjust service behaviours as necessary. The
NaaS service operational policy data model and the NaaS service data model have a one-to-many
relationship.
The NaaS service operational policy data model can manage and adjust resources behaviour as necessary.
The NaaS service operational policy data model and the NaaS resource data model have a one-to-many
relationship.

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