Page 296 - Cloud computing: From paradigm to operation

1 Framework and requirements for cloud computing

Inter-cloud federation

CSP B
s
CSC 1 Service X
p
CSP A p s CSP C
Service Y p
CSC 2

s
Service Z
CSC 3 CSP E CSP D

p Primary CSP Y.3511(14)_F8-3
s Secondary CSP

Figure 8-3 – CSP A offering services as the primary CSP
with the help of secondary CSPs
Inter-cloud federation

CSP B

CSC 1 Service X

CSP A CSP C
Service Y s
CSC 2

p
Service Z
CSC 3 CSP E p s CSP D

p Primary CSP Y.3511(14)_F8-4
s Secondary CSP

Figure 8-4 – CSP E offering services as the primary CSP
with the help of secondary CSPs

A given CSP can act as a primary CSP and secondary CSP, i.e., using the services of secondary CSPs (e.g., CSP
A in Figure 8-3) and providing services to a primary CSP (e.g., CSP A in Figure 8-4).
8.2.3 Network connectivity

In order to deliver cloud services based on the use of inter-cloud computing, network connectivity is required
among the involved CSCs, primary CSPs and secondary CSPs. Specifically, this includes:
– Connectivity between peer CSPs. By means of this connectivity, a primary CSP can interwork with
the secondary CSPs to request a service (e.g., backup of data or transfer of virtual machines between
connected CSPs). In some cases, this connectivity is provided on-demand; the connectivity is
established instantaneously as the need arises and removed after the need disappears;

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