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Optical Fast Reroute Adrian Farrel : Old Dog Consulting

OLD DOG CONSULTING. Why use Fast Reroute (FRR) in Packet Networks?. • 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). MPLS FRR Features.

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Optical Fast Reroute Adrian Farrel : Old Dog Consulting

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  1. OLD DOG CONSULTING Why use Fast Reroute (FRR) in Packet Networks? • 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) 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” Facility Backup 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 Optical Fast RerouteAdrian Farrel : Old Dog Consulting

  2. OLD DOG CONSULTING Path Resv Path Resv Switch configuration Optical FRR : Options for Deployment 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

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