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Autor(es) Olivier Bonaventure
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Changing one line in the LFIB

Consider the network shown below.

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
Failure of a link

In this network, the network operator claims that if the link R3-R5 fails, the failure can be quickly overcome. Explain his solution.