Optical Fast Reroute Adrian Farrel : Old Dog Consulting • Protect close to the fault to minimize fault propagation times • Best-effort recovery pending end-to-end rerouting • Applicable to all MPLS traffic (RSVP-TE and LDP) Why use Fast Reroute (FRR) in Packet Networks? Facility Backup MPLS FRR Features • Protection LSPs locally computed or pre-planned • Resources guaranteed, shared, or best-effort • Protected traffic filtered by priority • FRR requires knowledge of “exit label” Issues in Optical Networks • LSP nesting not possible in homogeneous networks • Labels are synonymous with resources • Statistical multiplexing can’t be done • Best-effort traffic delivery doesn’t make sense One-to-One FRR

LSP Stitching For Span Protection GMPLS Segment Protection (RFC 4873) Optical FRR : Options for Deployment Path Resv Switch configuration LSP Stitching (RFC 5150) • Looks like one-to-one FRR • Pre-planned or on-demand • 1+1 or 1:1 protection • Switchover coordination with Notify LSP Stitching For Span Protection • 1+1 or 1:1 protection on span • Pre-planned • End-to-end LSP stitched to protection segment • Signaling like hierarchical LSPs GMPLS Segment Protection (RFC 4873) • Complex, overlapping protection spans • Source-based planning and signaling • Association object relates all LSPs • 1:n, m:n, and extra traffic schemes OLD DOG CONSULTING