Page 860 - Cloud computing: From paradigm to operation

5 Intercloud and interoperability

Appendix I

Use case of inter-cloud trust management
(This appendix does not form an integral part of this Recommendation.)

I.1 Use case template
The use cases developed in this appendix should adopt the following unified format for better readability and
convenient material organization.

Table I.1 – Use case template
Title The title of the use case
Description Scenario description of the use case

Roles Roles involved in the use case
Figure (optional) Figure to explain the use case, optional not mandatory
Pre-conditions (optional) The necessary pre-conditions that should be achieved before starting
the use case
Post-conditions (optional) The post-conditions that will be carried out after the termination of
current use case
Derived requirements Requirements derived from the use cases, whose detailed description
is presented in the dedicated chapter

I.2 Use case of trusted network function virtualization
This use case illustrates trust management aspect in inter-cloud. The federation pattern of inter-cloud used
to illustrate the use case is an example only.

Table I.2 – Trusted network function virtualization

Title Trusted network function virtualization
Description A CSC requests ''premium aoftware'' as a service (software as a service (SaaS)), respecting
network quality of service (QoS). The CSP (SaaS) forms inter-cloud federation pattern
among CSP(PaaS) and CSPs (network as a service (NaaS)). The CSP(SaaS) becomes contact
point for CSC. The CSP-A(NaaS) and CSP-B(NaaS) uses network function virtualization (NFV)
and SDN technologies to serve NaaS service. The CSP(SaaS) uses a trust management
system to keep track of CSP(NaaS) service. In case CSP-A(NaaS) performed out of schemes
used to compute trust, the SaaS service is automatically established between the CSP(SaaS)
and CSP-B(NaaS). Additionally, the CSP(SaaS) updates information on reputation of
CSPs(NaaS).
Roles CSC, CSP(SaaS), CSP(PaaS), CSP(NaaS).

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