BFR1         (BFIR)
               /L11  \L12
              /       \
          BFR2         BFR3
         /L21 \L22    /L31 \L32
        /      \     /      \
       BFR4  BFR5   BFR6  BFR7
        \      /     \      /
         \    /       \    /
          BFR8         BFR9
              \       /
               \     /
                BFR10         (BFER)

  BIFT entry in BFR1:
  ------------------------------------------------------------------
  | 0:6   |  ECMP({forward_connected(L11, BFR2),                   |
  |       |        forward_connected(L12, BFR3)}, seed1)           |
  ------------------------------------------------------------------

  BIFT entry in BFR2:
  ------------------------------------------------------------------
  | 0:7   |  ECMP({forward_connected(L21, BFR4),                   |
  |       |        forward_connected(L22, BFR5)}, seed1)           |
  ------------------------------------------------------------------

  BIFT entry in BFR3:
  ------------------------------------------------------------------
  | 0:7   |  ECMP({forward_connected(L31, BFR6),                   |
  |       |        forward_connected(L32, BFR7)}, seed1)           |
  ------------------------------------------------------------------

  BIFT entry in BFR4, BFR5:
  ------------------------------------------------------------------
  | 0:8   |  forward_connected(Lxx, BFR8)  |xx differs on BFR4/BFR5|
  ------------------------------------------------------------------

  BIFT entry in BFR6, BFR7:
  ------------------------------------------------------------------
  | 0:8   |  forward_connected(Lxx, BFR9)  |xx differs on BFR6/BFR7|
  ------------------------------------------------------------------

  BIFT entry in BFR8, BFR9:
  ------------------------------------------------------------------
  | 0:9   |  forward_connected(Lxx, BFR10) |xx differs on BFR8/BFR9|
  ------------------------------------------------------------------