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                  _______________________________
                 /    _________     _________    \
From Peer A --->|(A)-|Best     |   |         |-[A]|--->To Peer A
From Peer B --->|(B)-|Path     |-->|Local-RIB|-[B]|--->To Peer B
From Peer C --->|(C)-|Selection|   |         |-[C]|--->To Peer C
From Peer D --->|(D)-|_________|   |_________|-[D]|--->To Peer D
                 \_______________________________/

Key:  (X) - 'In'  Filter applied to Peer X's announcements
      [X] - 'Out' Filter applied to announcements to Peer X