Advertising mpls labels in igps draft gredler rtgwg igp label advertisement
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Advertising MPLS labels in IGPs draft-gredler-rtgwg-igp-label-advertisement PowerPoint PPT Presentation

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Advertising MPLS labels in IGPs draft-gredler-rtgwg-igp-label-advertisement. Hannes Gredler <[email protected]>. 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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Advertising MPLS labels in IGPsdraft-gredler-rtgwg-igp-label-advertisement


<[email protected]>



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

Use case #1Increase (R-)LFA coverage

Pathologic Topologies

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

Use case #2TE by label-stacking

TE by label stacking per-neighbor labels

Use case #3Advertising TE LSPs

Advertise RSVP LSPs as Forwarding AdjacencyIssue: LSP path properties lost

Advertise existing LSPs & EROs-> Allows path property correlation


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

SDN ECMP weight controller and per-neighbor label

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, Gloab labels)

    • Working with authors to assess draft merge

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