Page 301 - Cloud computing: From paradigm to operation

Framework and requirements for cloud computing 1

Secondary
cloud service
provider
Catalogue of
service offerings
Connectivity between
secondary CSPs and
primary CSP
Primary
cloud
service
provider
Catalogue of
service offerings
Connectivity between
primary CSP and CSPs
CSC 1 CSC 2 CSC 3
Cloud service customers
Y.3511(14)_F8-9

Figure 8-9 – Primary and secondary CSPs and relevant network connectivity

As illustrated in Figure 8-9, the CSCs use services provided by the primary CSP. The catalogue of service
offerings in the primary CSP includes services from the secondary CSP. Since the CSCs use services through
the primary CSP, the primary CSP is responsible for ensuring that the service levels provided to the CSC meet
the SLA.

8.3.4 Interactions in the case of inter-cloud intermediary
Figure 8-10 shows the interactions involving a CSC and multiple CSPs in the case of the inter-cloud
intermediary pattern.

Primary CSP Secondary CSPs

CSC CSP A CSP B CSP C
1) Service information collection/registration

2) Service catalogue creation
3) Service selection
4a) Service offering (by primary CSP A directly)

4b) Service offering (by secondary CSP B via primary CSP A)

4c) Service offering (by secondary CSP C via primary CSP A)

Y.3511(14)_F8-10

Figure 8-10 – Interactions in inter-cloud intermediary pattern

Along with the service offering, the description hereafter shows the interactions involving multiple CSPs. The
steps as shown in Figure 8-10 are as follows:
1) The primary CSP collects service information from the secondary CSPs, or the secondary CSPs
register their services to the primary CSP. Difference in terms of SLAs is negotiated as well;
2) The primary CSP creates the catalogue of service offerings by combining the list of hosted services
and the services provided by the secondary CSPs;

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