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Advertising Per- node Admin Tags in IS-IS draft-psarkar-isis-node-admin-tag- 03

This draft provides guidelines on the implementation of node-admin tags in IS-IS, including their semantics and applications for routing purposes. It also introduces a new TLV for node admin tags.

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Advertising Per- node Admin Tags in IS-IS draft-psarkar-isis-node-admin-tag- 03

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  1. Advertising Per-nodeAdmin Tags in IS-ISdraft-psarkar-isis-node-admin-tag-03 PushpasisSarkarpsarkar@juniper.net ShraddhaHegdeshraddha@juniper.net Harish Raghuveerharish.r.prabhu@gmail.com Hannes Gredler hannes@juniper.net StephaneLitkowskistephane.litkowski@orange.com Bruno Decraenebruno.decraene@orange.com

  2. Summary of Updates • Node-admin tags • Guidelines on Implementation • Applications

  3. Node Admin Tags Semantics • Meaning of a node-admin tag is • Local to the network operator. • But unique across all the nodes in the same administrative domain. • Independent of the order the nodes are tagged with. • Facilitate any routing applications, that • Require advertisement of any node characteristics within the network deployment. • No need to define well-known values for each new characteristic required to be advertised.

  4. Implementations Guidelines • TLV 242 [RFC 4971] has 2 flooding scopes • Global (across Level 1 and Level 2, S-bit = 1) • Per-level (one per level, S-bit = 0) • MUST allow configuring tag values per flooding scope. • If already configured under global scope • MUST NOT allow configuring same tag value in any of Per-level scope. • If already configured under per-level scope for specific level • MAY allow configuring same value under per-level scope for the other level. • MUST NOT allow configuring same tag value in the global scope. • For MT deployments[RFC5120], MUST NOT allow configuring same tag value under different topologies.

  5. Applications • Auto-Discovery of Services. • Policy-based Path Selection. • Including/excluding specific sets of node characteristics. • Selection of Primary paths (using route-policies) • Selection of FRR Backup paths (draft-ietf-rtgwg-lfa-mageability) • TE path computations using • Node-preference constraints • Node-exclusion constraints. • Policy-based Explicit routing.

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

  7. Background Slides

  8. Prior Art • Link colors [RFC5305] • Does not really represent a node characteristic. • Even if used to represent node characteristic, all incoming links need to be colored (one per node characteristic type).

  9. Prior Art • Prefix tags [RFC5130] • If the router-ID is considered the prefix representing the node • Router-ID encoded in TLV134 or TLV242. • Corresponding tag encoded in TLVs 135, 235, 236 and 237. • Additional implementation complexity • No prefix tagging mechanism for OSPF yet • Looking for consistency across protocols • draft-ietf-ospf-node-admin-tag-00 • Most Traffic Engineering Database (TED) schema support • Nodes • Links • But not Prefixes

  10. Basic Concepts • Per-Node Admin Tags • 32-bit unsigned integer value. • Represents a specific node characteristic exhibited by one or more nodes in the network • One per type of node characteristic. • Facilitates logical grouping of nodes in network, that suites deployment needs. • One tag per group (per node characteristic type). • Multiple nodes exhibiting same characteristics • Belong to a group, • Tagged with same tag value. • Single node exhibiting multiple characteristics • Belongs to multiple groups. • Tagged with multiple tag values(one per group or node characteristics).

  11. 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 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ • SubTLV of Router-Cap TLV #242 (RFC 4971) • Unbound List of 32-Bit node colors (TLV-max-size costraints still applies)

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