site to site migration VMware

Hi,

We are migrating from one datasenter to another. Site A to Site B. (not sure if site is right term)

What communication need to be in place for migration ? copying everything to new datasenter and enabling. Do esxi host subnets need to talk to each other ?

subnet A <-> subnet B

subnet A1 <-> subnet B1 ??

subnet A2 <-> subnet B2 ?? I am having issues routing to this subnet because of overlapping subnet B2 in new site.

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Vcenter site A = subnet A

esxi host1 site A = subnet A1

esxi host2 site A = subnet A2

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Vcenter site B = subnet B

esxi host1 site B= subnet B1

esxi host2 site B = subnet B2

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