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This is enabled by installing two Ethernet NICs per target server, with a minimum bandwidth of 1 Gbs each.
For additional details, see https://cwiki.apache.org/confluence/display/VCL/Network+Layout
Note from above that under some possible operational modes, only one NIC is required (e.g., when accessing the IBM Smart Cloud). Under other circumstances (e.g., controlling blades) more than two NICs may be recommended.