  Technology market is continuing a rapid growth phase where different resource
providers and Cloud Management Frameworks are positioning to provide ad-hoc
solutions -in terms of management interfaces, information discovery or billing-
trying to differentiate from competitors but that as a result remain
incompatible between them when addressing more complex scenarios like federated
clouds. Grasping interoperability problems present in current infrastructures
is then a must-do, tackled by studying how existing and emerging standards
could enhance user experience in the cloud ecosystem. In this paper we will
review the current open challenges in Infrastructure as a Service cloud
interoperability and federation, as well as point to the potential standards
that should alleviate these problems.
