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. 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 igps draft gredler rtgwg igp label advertisement

Advertising MPLS labels in IGPsdraft-gredler-rtgwg-igp-label-advertisement

HannesGredler

<[email protected]>

IETF86

March2013


Motivation and rationale

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 1 increase r lfa coverage

Use case #1Increase (R-)LFA coverage


Pathologic topologies

Pathologic Topologies


Add one hop strict forwarding labels stack em

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


Use case 2 te by label stacking

Use case #2TE by label-stacking


Te by label stacking per neighbor labels

TE by label stacking per-neighbor labels


Use case 3 advertising te lsps

Use case #3Advertising TE LSPs


Advertise rsvp lsps as forwarding adjacency issue lsp path properties lost

Advertise RSVP LSPs as Forwarding AdjacencyIssue: LSP path properties lost


Advertise existing lsps eros allows path property correlation

Advertise existing LSPs & EROs-> Allows path property correlation


Use case 4 egress wan sdn control er

Use case #4EGRESS WAN SDN CONTROL(ER)


Current te framework only offers egress node control no good egress link control

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


Sdn ecmp weight controller and per neighbor label

SDN ECMP weight controller and per-neighbor label


Next steps

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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