text: Figure 4-42 Example fabric port configuration 
  
  This configuration includes the following characteristics: 
  
  (cid:2) It consists of four nodes, where nodes 1 and 2 are in a system at site A and nodes 3 and 4 
  are in a system at site B. 
  
  (cid:2) Each site has two switches (switch 1 and 2 at site A; switch 3 and 4 at site B). 
  
  (cid:2) Each node has two adapters (A and B). 
  
  (cid:2) Each adapter has four ports where the port is named P nodeid adapterid portnumber; for 
  example, port 3 on adapter B of node 4 is named P4B3. 
  
  The positions in the mask represent the Fibre Channel I/O port IDs with ID 1 in the rightmost 
  position. In this example, ports A1, A2, A3, A4, B1, B2, B3, and B4 correspond to FC I/O port 
  IDs 1, 2, 3, 4, 5, 6, 7 and 8. 
  
  To set the local port mask, use the**chsystem**command. Limit local node-to-node 
  communication to ports A1, A2, A3, and A4 by applying a port mask of 00001111 to both 
  systems, as shown in Example 4-1. 