Page 624 - Cloud computing: From paradigm to operation

3 XaaS

Network capabilities can be delivered through any combination of the three types of cloud capabilities. In
particular, network capabilities could support cloud computing in aspects of interconnection of the CSP and
the CSC, topology and route related functionality to share topologies, discovery related functionality to
perform other services needed by inter-cloud related activities as well as other functionalities related to
monitoring, protection, verification, etc.
Network functionality can be provided as a composite NaaS service where the NaaS service consists of more
than one network functionality services. Hierarchically nested NaaS composite services can also be provided.
Composite NaaS services could apply for different NaaS capabilities types provided to CSC according to the
performance objectives expressed in the service level agreement (SLA).

Figure 6-1 – High-level concept of NaaS

Appendix II provides NaaS use cases in which the three cloud capabilities types (i.e., application, platform
and infrastructure capabilities) are provided to the CSC.
Appendix III provides considerations on the CSP's network related activities.
NOTE 4 – Regarding the network connectivity, one important difference between Infrastructure as a Service (IaaS) and
NaaS is that IaaS is a cloud service category that is offered in only one flavour of cloud capability type, and that is
infrastructure capabilities type [ITU-T Y.3500]. However, NaaS is a cloud service category that can be offered in all three
cloud capabilities types.

7 Functional requirements of NaaS application
This clause provides requirements of NaaS application derived from the use cases described in Appendix II.

7.1 Performance

– NaaS application performance is recommended to be manageable to satisfy the CSC's needs.
– It is recommended that NaaS CSP monitors the utilization and delivery performance of NaaS
application.

– NaaS application is recommended to be provided to the CSC according to the performance
objectives expressed in the SLA.

7.2 Operation and management

– The operation of NaaS application is required to be manageable and deterministic in accordance
with the CSP operational policies.
– It is recommended that each NaaS application be managed by NaaS CSP efficiently and
automatically, complying with the CSP's common framework of service management and service
operation management.

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