The exhibit presents packets being transmitted inside an LSP's multi-segment primary path going from router R1 to router R8. The LSP also has a standby secondary path, and Seamless-BFD has been enabled on the primary path. The link between routers R1 and R2 fails, and fast re-route (FRR) is triggered. As a result, router R1 forwards the packets to router R3 and adds the proper FRR encapsulation to reach which router?
When the link between routers R1 and R2 fails, router R1 triggers fast re-route (FRR) to ensure continuity of the packet flow. In this scenario, router R1 would forward the packets to router R3 and add the proper FRR encapsulation to reach router R4, which is the tail-end of the active segment. This is because router R4 is the next-hop in the Segment Routing path from where the packet can continue its journey towards the destination as per the original path.
In case Seamless-BFD enabled, Secondary Path will be used for Head-end FRR.
C is correct
C is the correct answer