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Advertising MPLS labels in IGPs draft-gredler-rtgwg-igp-label-advertisement

Advertising MPLS labels in IGPs draft-gredler-rtgwg-igp-label-advertisement. Hannes Gredler <hannes@juniper.net>. IETF86 March 2013. Motivation and Rationale. R-LFA implementation requires more tight integration of LDP and IGP B i-directional notification path between protocols

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Advertising MPLS labels in IGPs draft-gredler-rtgwg-igp-label-advertisement

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  1. Advertising MPLS labels in IGPsdraft-gredler-rtgwg-igp-label-advertisement HannesGredler <hannes@juniper.net> IETF86 March2013

  2. Motivation and Rationale • R-LFA implementation requires more tight integration of LDP and IGP • Bi-directional notification path between protocols • MPLS transport label distribution are Session oriented protocols • You need to have a session with a neighbor in order to receive/distribute bindings • Interesting use cases for >1 hop distribution of transport labels

  3. Use case #1Increase (R-)LFA coverage

  4. Pathologic Topologies

  5. Add one-hop strict forwarding labels (stack ‘em)

  6. Use case #2TE by label-stacking

  7. TE by label stacking per-neighbor labels

  8. Use case #3Advertising TE LSPs

  9. Advertise RSVP LSPs as Forwarding AdjacencyIssue: LSP path properties lost

  10. Advertise existing LSPs & EROs-> Allows path property correlation

  11. Use case #4EGRESS WAN SDN CONTROL(ER)

  12. Current TE framework only offers egress Node control.-> No good Egress Link control

  13. SDN ECMP weight controller and per-neighbor label

  14. Next Steps • Yesterday (20130313) submission isis-wg • draft-previdi-filsfils-isis-segment-routing-00 • Core is advertising “segments” for source routing • IGP disseminates “segment” • Some similarities (IGP label) • Some discrepancies (Advertising existing labels, Global labels) • Working with authors to assess draft merge

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