Status update for WG lsr

The Link-State Routing (LSR) Working Group is chartered to document current protocol implementation practices and improvements, protocol usage scenarios, maintenance and extensions of the link-state interior gateway routing protocols (IGPs) - specifically IS-IS, OSPFv2, and OSPFv3. The LSR Working Group was formed by merging the ISIS and OSPF WGs and assigning all their existing adopted work at the time of chartering to LSR.

Current areas of interest in the LSR WG include:

 * Segment Routing Extensions: The IS-IS, OSPFv2, and OSPFv3 extensions for the MPLS data plane are either on the RFC queue or in the final review cycle. 

   - OSPF Segment Routing Extensions - https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-extensions/
   - IS-IS Segment Routing Extensions - https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extensions/
   - OSPFv3 Segment Routing Extensions - https://datatracker.ietf.org/doc/draft-ietf-ospf-ospfv3-segment-routing-extensions/
   - Segment Routing in the MPLS Data Plane - https://datatracker.ietf.org/doc/draft-ietf-spring-segment-routing-mpls/


 * Segment Routing Extensions based for IPv6 are being developed. 

   - IS-IS Extensions to Support Routing over IPv6 Data Plane - https://datatracker.ietf.org/doc/draft-bashandy-isis-srv6-extensions/

 * YANG Modeling: The base OSPF YANG Model has completed WG last call and is ready for publication request. The base IS-IS model will follow shortly. We have various model drafts for extensions that can be progressed now that the base models are nearly publication. The relevant YANG model drafts include:

 * The following YANG models are awating AD Review:     

    - YANG Data Model for OSPF Protocol - https://datatracker.ietf.org/doc/draft-ietf-ospf-yang/
    - YANG Data Model for IS-IS Protocol - https://datatracker.ietf.org/doc/draft-ietf-isis-yang-isis-cfg/

 *  The following are being developed.

    - YANG Data Model for OSPF Segment Routing - https://datatracker.ietf.org/doc/draft-ietf-ospf-sr-yang/
    - YANG Data Model for IS-IS Segment Routing - https://datatracker.ietf.org/doc/draft-ietf-isis-sr-yang/
    - YANG Model for OSPFv3 Extended LSAs - https://datatracker.ietf.org/doc/draft-acee-lsr-ospfv3-extended-lsa-yang/

 * Computation Optimizations: There are both WG documents and individual proposals to improve the LSR route computation. These include: 

    - IGP Flexible Algorithm - https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/
    - OSPF Routing with Cross-Address Family Traffic Engineering Tunnels - https://datatracker.ietf.org/doc/draft-ietf-ospf-xaf-te/

 * Link Attribute Advertisement: OSPF and ISIS will allow application specific link attributes. These drafts will be WG last called shortly after IETF 104. 

    - IS-IS TE App - https://datatracker.ietf.org/doc/draft-ietf-isis-te-app/
    - OSPF Link Traffic Engineering (TE) Attribute Reuse - https://datatracker.ietf.org/doc/draft-ietf-ospf-te-link-attr-reuse/

 * Data Center (DC) Routing Optimizations - We have adopted the base dynamic flooding draft. This draft doesn't specify the algorithm and work on algorithms can now proceed in separate drafts. 

 * The following are WG documents with updates at Prague: 

    - IS-IS Spine Leaf - https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-spine-leaf-ext
    - Dynamic flooding - https://datatracker.ietf.org/doc/draft-ietf-lsr-dynamic-flooding

At IETF 104, there will be updates on existing WG documents as well as presentations on following new work:

     - IS-IS Invalid TLV - https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-invalid-tlv
     - Update to IS-IS SRv6 - https://datatracker.ietf.org/doc/draft-bashandy-isis-srv6-extensions
     - OSPFv3 BIER Extensions - https://datatracker.ietf.org/doc/draft-psenak-bier-ospfv3-extensions/
     - OSPF Admin Tags - https://datatracker.ietf.org/doc/draft-acee-lsr-ospf-admin-tags
     - OSPF Reverse Metric - https://datatracker.ietf.org/doc/draft-ketant-lsr-ospf-reverse-metric
     - OSPF BFD Strict Mode - https://datatracker.ietf.org/doc/draft-ketant-lsr-ospf-bfd-strict-mode
     - Updates to Flooding Reduction - https://datatracker.ietf.org/doc/draft-cc-lsr-flooding-reduction/
     - OSPFv3 Extended LSA YANG Model - https://datatracker.ietf.org/doc/draft-acee-lsr-ospfv3-extended-lsa-yang/
     - Hierarchial IS-IS - https://datatracker.ietf.org/doc/draft-li-hierarchical-isis/
     - IS-IS Area Abstraction - https://www.ietf.org/id/draft-li-lsr-isis-area-abstraction-00.txt

Document Status:

  * Since the last IETF in Bangkok, the following RFC have been published:

    - RFC 8444 - OSPFv2 Extensions for Bit Index Explicit Replication (BIER) – BIER WG Document
    - RFC 8476 – Signaling Maximum SID Depth (MSD) using OSPF
    - RFC 8491 – Signaling Maximum SID Depth (MSG) using ISIS
    - RFC 8500 – IS-IS with Reverse Metric
    - RFC 8510 - OSPF Link-Local Signaling (LLS) Extensions for Local Interface ID Advertisement
    - RFC 8570 – RFC 7810 Correction of IS-IS TE Metric Extensions encoding 

  * The following drafts are on the RFC Queue waiting for missed references:

    - Advertising L2 Bundle Member Link Attributes in IS-IS -  draft-ietf-isis-l2bundles-07.txt– Waiting on ISIS SR Extensions. 
    - The Tunnel Encapsulations OSPF Router Information draft-ietf-ospf-encapsulation-cap-09 – Waiting on IDR Tunnel Encap Draft (To be presented in IDR) 
    - OSPF Extensions for Segment Routing - draft-ietf-ospf-segment-routing-extensions-27 - Waiting on “Segment Routing with MPLS Data Plane” and “Segment Routing InterOp with LDP"
    -  OSPFv3 Extensions for Segment Routing  - draft-ietf-ospf-ospfv3-segment-routing-extensions-23 – Also waiting on same drafts. 

  * The following drafts are in the AD review process:

    - H-bit Support for OSPFv2 draft-ietf-ospf-ospfv2-hbit-06 – Waiting on authors for revised update for simple comments for over 100 days!
    - IS-IS Extensions for Segment Routing draft-ietf-isis-segment-routing-extensions-22 – Comments recently provided and revised ID required
    - YANG Data Model for OSPF Protocol - draft-ietf-ospf-yang-21 – Waiting on AD Review
    - YANG Data Model for IS-IS Protocol - draft-ietf-isis-yang-isis-cfg-35 – Waiting on AD Review
    - OSPF Routing with Cross-Address Family Traffic Engineering Tunnels - draft-ietf-ospf-xaf-te-05 – Publication just requested. 

  * The following drafts are in WG last call:

    - Restart Signaling for IS-IS - draft-ietf-lsr-isis-rfc5306bis-01
 
  * The following drafts will be WG last called soon:

    - IS-IS TE Attributes per application - draft-ietf-isis-te-app-05.txt 
    - OSPF Link Traffic Engineering (TE) Attribute Reuse - draft-ietf-ospf-te-link-attr-reuse-06.txt 

   * The following are new WG documents:

    - Dynamic Flooding on Dense Graphs - draft-ietf-lsr-dynamic-flooding-00
    - IS-IS Routing for Spine-Leaf Topology - draft-ietf-lsr-isis-spine-leaf-ext-01 
    - OSPF Extension for Prefix Originator - draft-ietf-lsr-ospf-prefix-originator-00 
    - IGP extension for PCEP security capability support in the PCE discovery - draft-ietf-lsr-pce-discovery-security-support-00

   * The following are existing WG documents:

    - Signaling Entropy Label Capability and Entropy Readable Label Depth Using - IS-IS draft-ietf-isis-mpls-elc-06 - Authors need to bring forward
    - Signaling Entropy Label Capability and Entropy Readable Label-stack Depth Using OSPF - draft-ietf-ospf-mpls-elc-07 - Authors need to bring forward
    - IGP Flexible Algorithm draft-ietf-lsr-flex-algo-01.txt - Work on implementations in progress
    - YANG Data Model for OSPF SR (Segment Routing) Protocol draft-ietf-ospf-sr-yang-07 - To be progressed now that base YANG documents are with AD
    - YANG Data Model for IS-IS Segment Routing draft-ietf-isis-sr-yang-05 - To be progressed now that base YANG documents are with AD 

Date: March 24th, 2019
         

       





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