,---------------------------------------.
           ,-.   |IEEE Std. 802.1AS-2011 clause 10.3.12.2|
           | |   |---------------------------------------|
           |-|   |PortRoleSelection state machine        |
           `-'   |                                       |
             |   `---------------------------------------'
             |                                            
             |                                            
,------------------------.                                
|INIT_BRIDGE             |                                
|------------------------|                                
|updateRoleDisabledTree()|                                
`------------------------'                                
             |                                            
  ,-------------------.                                   
  |ROLE_SELECTION     |                                   
  |-------------------|                                   
  |clearReselectTree()|                                   
  |updateRolesTree()  |                                   
  |setSelectedTree()  |                                   
  `-------------------'