Consider the network shown below.
![https://inginious.info.ucl.ac.be/course/lingi2142-QCM/mpls-pre-frr/mpls-pre-frr.png](https://inginious.info.ucl.ac.be/course/lingi2142-QCM/mpls-pre-frr/mpls-pre-frr.png)
R1
sends packets with label L7
while R2
sends packets with label L4
The LFIB of the different routers are configured as follows.
Router R3
Label | Nexthop | Operation |
L7 | R5 | SWAP(L6) |
L4 | R5 | SWAP(L9) |
Router R5
Label | Nexthop | Operation |
L9 | R4 | POP |
L6 | R7 | POP |
Router R6
Label | Nexthop | Operation |
L9 | R8 | SWAP(L1) |
Router R8
Label | Nexthop | Operation |
L1 | R5 | POP |