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diff --git a/docs/requirements/use_cases/multiple_backends.rst b/docs/requirements/use_cases/multiple_backends.rst new file mode 100644 index 0000000..0d4ab13 --- /dev/null +++ b/docs/requirements/use_cases/multiple_backends.rst @@ -0,0 +1,37 @@ +.. This work is licensed under a Creative Commons Attribution 4.0 International License. +.. http://creativecommons.org/licenses/by/4.0 +.. (c) Bin Hu + +Network Function Virtualization (NFV) brings the need of supporting multiple networking +back-ends in virtualized infrastructure environment. + +First of all, a Service Providers' virtualized network infrastructure will consist of +multiple SDN Controllers from different vendors for obvious business reason. +Those SDN Controllers may be managed within one cloud or multiple clouds. +Jointly, those VIMs (e.g. OpenStack instances) and SDN Controllers need to work +together in an interoperable framework to create NFV services in the Service +Providers' virtualized network infrastructure. It is needed that one VIM (e.g. OpenStack +instance) shall be able to support multiple SDN Controllers at back-end. + +Secondly, a Service Providers' virtualized network infrastructure will serve multiple, +heterogeneous administrative domains, such as mobility domain, access networks, +edge domain, core networks, WAN, enterprise domain, etc. The architecture of +virtualized network infrastructure needs different types of SDN Controllers that are +specialized and targeted for specific features and requirements of those different domains. +The architectural design may also include global and local SDN Controllers. And multiple +local SDN Controllers may be managed by one VIM (e.g. OpenStack instance). + +Furthermore, even within one administrative domain, NFV services could also be quite diversified. +Specialized NFV service needs specialized and dedicated SDN Controller too. Thus a Service +Provider needs to use multiple APIs and back-ends simultaneously in order to provide +users with diversified services at the same time. At the same time, for a particular NFV service, +the new networking APIs need to be agnostic of the back-ends. + +Therefore, it is expected that in NFV networking service domain: + +* One OpenStack instance shall support multiple APIs and SDN Controllers simultaneously + +* Interoperability is needed among multi-vendor SDN Controllers at back-end + +* New NFV Networking APIs shall be agnostic of back-ends + |