BFD-Triggered Local Repair for Rapid Convergence

Enables to configure BFD and MPLS ping for fast-failure detection without relying on fast physical level detection. With links between routers, when a route goes down, the rpd recalculates the next best path. When MPLS-FRR is enabled, ifl messages are flooded to all FPCs. The edge FPC enables the bypass MPLS LSP tunnel. Lastly, all routes are repaired and sent through the bypass MPLS LSP tunnel. The amount of time it takes to repair all routes is proportional to the number of routes.