+--------------+                                   
|VPN-NODE      |                                
|           +--+-------+                          
|           | NET-ACC-1| Primary                      
|           |          +------------------               
|           +--+-------+                                
|              |                       
|           +--+-------+                     
|           | NET-ACC-2| Secondary                  
|           |          +------------------
|           +--+-------+                  
|              |                                    
+--------------+