Before the release of VMware vSphere 5, designing a vMotion network was relatively easy as it was straightforward. vMotion in VMware vSphere 5.0 and above is able to leverage multiple NICs. By default, a single vMotion will use only one NIC regardless of how many NICs are set up for vMotion. Running multiple vMotions at the same time will utilize multiple NICs. Implementing a multi-NIC vMotion will allow a single vMotion operation to use multiple NICs at once and reduce the duration of that operation.