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Remote LFA

Remote LFA. Alternate selection. Per-Prefix LFA Remote LFA with implicit LDP LSP to PQ node Remote LFA with explicit RSVP LSP to Q node rule 3 is optional and happens only if 100%-coverage is desired. Excellent Coverage ( rule2 ).

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Remote LFA

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  1. Remote LFA

  2. Alternate selection • Per-Prefix LFA • Remote LFA with implicit LDP LSP to PQ node • Remote LFA with explicit RSVP LSP to Q node rule 3 is optional and happens only if 100%-coverage is desired

  3. Excellent Coverage (rule2) Confirmed by independent study (Wandl/Verizon at Isocore 2010), or Cariden

  4. 100% Coverage (rule3) • Rule3 • Already available via non-automated PQ algorithm in 3 router implementations, under deployment

  5. Excellent Scale • Implicit LDP LSP to PQ (rule2) always exist • No new LSP required at all

  6. Incremental Deployment • Keep the LFA properties • No protocol change at all • Only requires new code at the node where RemoteLFA is enabled • Specifically, the PQ node does not require new code

  7. Simple computation • PQ is per-link not per-prefix • P set is known once per-prefix LFA is computed • Q set is a simple dijkstra

  8. Reality • One router implementation is FCS • A second one on the line • Others expected based on deployment discussion • Confirmed deployment projects

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