1. A method to process packets in a multi-tenant Software Defined Network (SDN) having a switch, comprising: for each tenant in a set of multiple tenants that use the SDN, assigning a particular port of the switch as an information processing port (IPP) for the tenant; maintaining a data set that associates a particular port with a particular tenant; configuring the switch according to information in the data set and at least one tenant-specific policy; and applying the at least one tenant-specific policy to a tenant-specific packet flow based on the IPP for the tenant.