text: The systems’ IP addresses are, by default, in remote copy port group 0. Ports in port group 0 
  are not considered for creating remote copy data paths between two systems. For 
  partnerships to be established over IP links directly, IP ports must be configured in remote 
  copy group 1 if a single inter-site link exists, or in remote copy groups 1 and 2 if two inter-site 
  links exist. 