+-----------------------------------------------------+
       |                                                     |
       |                      VPN2 Link                      |
       |              |<-------------------->|               |
       |              |                      |               |
       |      VPN2+---+---+              +---+---+VPN2       |
       |       TP1| VN1   |  Tunnel PM   |  VN3  |TP2        |
       |       ---+ PE A  |==============|  PE B +----       |
       |vpn-access+-------+              +-------+ vpn-access|
       |-interface|                              | -interface|
       |          |##############################|           |
       |          |inter-vpn-access-interface PM |           |
       |                                                     |
       +-----------------------------------------------------+
       |                                                     |
       |                                                     |
+----+ |        TP+-----+ Link  +---+ Link  +-----+TP        | +----+
| CE4+-+----------+ N1  +-------+-N2+-------+  N3 +----------+-+CE5 |
+----+ |       1-1+-----+1-2 2-1+---+2-2 3-1+-----+3-2       | +----+
       |                                                     |
       |                                                     |
       +-----------------------------------------------------+

       Legend:
         N:  node   
         VN: VPN Node 
         TP: Termination Point 
         -:  Link