Cross replication set Up

Customer has 2 new VNX5300s in 2 seperate sites .They have a CIFS- (from Windows Clients ) only environment .

shares will be configured on new VNX5300’s. Half of the schools will get CIFS data from  the array on site 1  and the other half will get CIFS data from the array on site 2 . The design goal is to replicate the CIFS data from site 1  to site 2  and to replicate the CIFS data from site 2 to create a secondary copy at an alternate site.

Can any one please guide me on how I can set up the network connectivity between the two sites .customer  wants  all the Datas to be replicated and want to have a cross replication set up.Appreciate some insight .

thanks!