I don't know if it is still the case with ESXi 5 but with 4.1 if the Management interface and the vMotion interface were configured on the same subnet, even if they used different vSwitches, then the vMotion traffic went out of the pNIC configured for Management, even of the vMotion vmkernel port was configured to use a different pNIC on the same vSwitch as detailed above. See ESXi4.1 vMotion using incorrect vmnic | Pelicano Computer Services
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