text: During the VLAN configuration for each IP address, the VLAN settings for the local and 
  failover ports on two nodes of an I/O Group can differ. To avoid any service disruption, 
  switches must be configured so that the failover VLANs are configured on the local switch 
  ports and the failover of IP addresses from a failing node to a surviving node succeeds. If 
  failover VLANs are not configured on the local switch ports, there are no paths to the IBM 
  Spectrum Virtualize system nodes during a node failure and the replication fails. 
  
  Consider the following requirements and procedures when implementing VLAN tagging: 
  
  (cid:2) VLAN tagging is supported for IP partnership traffic between two systems. 
  
  (cid:2) VLAN provides network traffic separation at the layer 2 level for Ethernet transport. 
  
  (cid:2) VLAN tagging by default is disabled for any IP address of a node port. You can use the CLI 
  or GUI to optionally set the VLAN ID for port IPs on both systems in the IP partnership. 
  
  (cid:2) When a VLAN ID is configured for the port IP addresses that are used in remote copy port 
  groups, appropriate VLAN settings on the Ethernet network must also be configured to 
  prevent connectivity issues. 
  
  Setting VLAN tags for a port is disruptive. Therefore, VLAN tagging requires that you stop the 
  partnership first before you configure VLAN tags. Restart the partnership after the 
  configuration is complete. 