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Most universities use visualization today and most of them run their own vmware WMware (or similar) clusters. The next logical step is to outsource the operation of the vmware WMware cluster itself to a commercial hosting provider. There are indications that several universities are thinking about taking this step in the near future and are expecting the NREN to facilitate the transition. The transition from locally managed visualization to remote hosted visualization will take place over the course of several years and may never fully finish - some services may need to reside on locally managed (much smaller) clusters. Hence we need to prepare for a situation where universities sometimes buy visualization service from commercial providers and sometimes use local resources - perhaps shared between collaborating campuses.
In either case a core requirement will be that services can be moved easily between hosting providers, eg between a local to a commercial externally operated cluster as part of a transition process to the commercial vendor or between two commercial vendors when switching vendors. In order for that move to be painless it is imperative to avoid IP renumbering. This in turn implies that the network layer must support private networks on layer 2. Furthermore the number of transitions (eg moves of hosts) will probably be relatively large which means that the provisioning of private layer 2 networks must be available to end-users or at least to university local tech support.
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