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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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PowerPoint Slideshow about 'Remote LFA' - herman-ayers


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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