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Advertising Per- node Admin Tags in IS-IS draft-psarkar-isis-node-admin-tag- 01

Advertising Per- node Admin Tags in IS-IS draft-psarkar-isis-node-admin-tag- 01. Pushpasis Sarkar psarkar @ juniper.net Shraddha Hegde shraddha @ juniper.net Harish Raghuveer hraghuveer @ juniper.net Hannes Gredler hannes@juniper.net Stephane Litkowski stephane.litkowski @ orange.com

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Advertising Per- node Admin Tags in IS-IS draft-psarkar-isis-node-admin-tag- 01

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  1. Advertising Per-nodeAdmin Tags in IS-ISdraft-psarkar-isis-node-admin-tag-01 PushpasisSarkarpsarkar@juniper.net ShraddhaHegdeshraddha@juniper.net Harish Raghuveerhraghuveer@juniper.net Hannes Gredler hannes@juniper.net StephaneLitkowskistephane.litkowski@orange.com Bruno Decraenebruno.decraene@orange.com

  2. Rationale • Node color is used for describing path constraints • IP paths • MPLS paths • there is a category of path constraints which requires that a certain path should or should not be routed over a node with specific properties. • go over the packet-optical super-core • don't go over any other PE router • don't go over any other ASBR (hot potato) • don't go over equipment from vendor X • don’t go over nodes with limited hardware capabilities (e.g. LB) • don't go over equipment which is running software version x.y.z • de-prefer nodes which have not good hardware based latency measurements

  3. Re-using existing protocols ? (1) • Link colors as per RFC5305 ? • One has to tag all incoming links (=touching N nodes) to color a specific node

  4. Re-using existing protocols ? (2) • Prefix tags as per RFC5130 ? • No bijectionbetween a node (router-ID) and some prefix (which carries the tags) • In fact those are different name-spaces • What about L1L2 case for Prefix leaking ? • How to differentiate leaked prefixes vs. self-originated prefixes ? • No prefix tagging mechanism for OSPF yet • Looking for consistency across protocols • draft-hegde-ospf-node-admin-tag-01 • For MPLS/TE paths most implementations of Traffic Engineering Database (TED) schema support • Nodes • Links • But not Prefixes

  5. Per-Node Admin Tag subTLV 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type | Length | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Administrative Tag #1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Administrative Tag #2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ // // +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Administrative Tag #N | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • subTLVof Router-Cap TLV #242 (RFC 4971) • Unbound List of 32-Bit node colors

  6. Next Steps • Questions ? • Adoption as a WG item ?

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