Remote lfa
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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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Remote lfa

Remote LFA


Alternate selection

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

Excellent Coverage (rule2)

Confirmed by independent study (Wandl/Verizon at Isocore 2010), or Cariden


100 coverage rule3

100% Coverage (rule3)

  • Rule3

    • Already available via non-automated PQ algorithm in 3 router implementations, under deployment


Excellent scale

Excellent Scale

  • Implicit LDP LSP to PQ (rule2) always exist

    • No new LSP required at all


Incremental deployment

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


Simple computation

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


Reality

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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