BGP-LS Consumer
                         ^
                         |
                        RR0
                 (BGP Route Reflector)
                      /      \
                     /        \
              a1    /   a0     \    a1
         R1 ------ R2 -------- R3 ------ R4
     a1  |                               |  a1
         |                               |
         R5 ---------------------------- R6
                        a1