+------------------------------------------+
         |        Integrated Router/Bridges         |

         +-------+        +--------+        +-------+
         |       |    IRB1|        |IRB2    |       |
 H1 -----+  BD1  +--------+   PE1  +--------+  BD2  +------H3
         |(Seg-1)|        |(L3 Rtg)|        |(Seg-1)|
 H2 -----|       |        |        |        |       |
         +-------+        +--------+        +-------+
    |___________________|     |       |____________________|
               LAN1           |                   LAN2
                              |
                              |
         +-------+        +--------+        +-------+
         |       |    IRB1|        |IRB2    |       |
 H4 -----+  BD1  +--------+   PE2  +--------+  BD2  +------H5
         |(Seg-2)|        |(L3 Rtg)|        |(Seg-2)|
         |       |        |        |        |       |
         +-------+        +--------+        +-------+