This article gives the links to documents pertaining to Virtual Machine Traffic Optimization or VMTO configuration

VMTO is an effective mechanism to route traffic to the optimal gateway when a host or VM is relocated within or between datacenters. The following documents help in understanding this concept better: 

• Configure VMTO for EVPN : https://www.juniper.net/documentation/us/en/software/nce/sg-005-data-center-fabric/topics/task/vmto.html
• Products supporting VMTO :  https://apps.juniper.net/feature-explorer/feature/7350?fn=Ingress%20Virtual%20Machine%20Traffic%20Optimization%20(VMTO)
• Ingress VM traffic optimization : https://www.juniper.net/documentation/us/en/software/junos/evpn/topics/concept/evpn-ingress-vmto.html