- Written by Ajay Kini
- Posted on September 16, 2025
- Updated on September 16, 2025
- 665 Views
This feature allows configuring backup entries for static MPLS LFIB routes via EOS SDK RPC to be activated if its corresponding primary entries are unable to forward traffic due to next hops being unresolved or its corresponding interface being down. Any backup entries will not be activated to forward traffic until all primary entries are unviable. Thereby, backup entries configured for the Static MPLS routes are a mechanism to achieve fast failover when the primary path fails.
- Written by Nikhil Goyal
- Posted on December 20, 2024
- Updated on December 20, 2024
- 3247 Views
Topology Independent Fast Reroute, or TI-LFA, uses OSPF SR to build loop-free alternate paths along the post-convergence path. These loop-free alternates provide fast convergence.
- Written by Matthew Carrington-Fair
- Posted on December 18, 2024
- Updated on December 18, 2024
- 3068 Views
EOS 4.15.0F added support for a CLI knob to determine whether the L3 forwarding agent (responsible for programming FECs and routes into hardware) would react to BFD status events for an interface to update next-hop programming for FECs programmed in hardware. This required two events, one for the BFD session to transition to an “Up” status and a subsequent transition to a “Down” status. This is identical to how various protocols in EOS (i.e. BGP, IS-IS) leverage BFD for faster down detection, and is useful to allow the L3 forwarding agent to preemptively remove next hops that would later be deprogrammed due to protocol session status state.