Internet Assigned Numbers Authority

                                                      Interior Gateway Protocol (IGP) Parameters

   Created
           2017-12-18

   Last Updated
           2021-11-23

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   Registries included below

     * IGP Algorithm Types
     * IGP MSD-Types
     * Link Attribute Application Identifiers

IGP Algorithm Types

   Registration Procedure(s)

 Standards Action

   Reference
           [RFC8665]

   Available Formats
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    Value                                                   Description                                                          Reference
           Shortest Path First (SPF) algorithm based on link metric. This is the standard shortest path algorithm as
   0       computed by the IGP protocol. Consistent with the deployed practice for link-state protocols, Algorithm 0     [RFC8665]
           permits any node to overwrite the SPF path with a different path based on its local policy.
           Strict Shortest Path First (SPF) algorithm based on link metric. The algorithm is identical to Algorithm 0
   1       but Algorithm 1 requires that all nodes along the path will honor the SPF routing decision. Local policy at   [RFC8665]
           the node claiming support for Algorithm 1 MUST NOT alter the SPF paths computed by Algorithm 1.
   2-127   Unassigned
   128-255 Flexible Algorithms (TEMPORARY - registered 2018-06-06, extension registered 2021-04-22, expires 2022-06-06)  [draft-ietf-lsr-flex-algo]

IGP MSD-Types

   Registration Procedure(s)

 Expert Review

   Expert(s)

 Uma Chunduri, Jeff Tantsura

   Reference
           [RFC8491]

   Available Formats
           [IMG]
           CSV

    Value            Name                         Reference
   0       Reserved                 [RFC8491]
   1       Base MPLS Imposition MSD [RFC8491]
   2       ERLD-MSD                 [RFC9088]
   3-40    Unassigned
   41      SRH Max SL               [RFC-ietf-lsr-isis-srv6-extensions-18]
   42      SRH Max End Pop          [RFC-ietf-lsr-isis-srv6-extensions-18]
   43      Unassigned
   44      SRH Max H.encaps         [RFC-ietf-lsr-isis-srv6-extensions-18]
   45      SRH Max End D            [RFC-ietf-lsr-isis-srv6-extensions-18]
   46-250  Unassigned
   251-254 Experimental Use         [RFC8491]
   255     Reserved                 [RFC8491]

Link Attribute Application Identifiers

   Registration Procedure(s)

 Expert Review

   Expert(s)

 Les Ginsberg, Chris Hopps

   Reference
           [RFC8919]

   Available Formats
           [IMG]
           CSV

   Bit               Name              Reference
   0    RSVP-TE (R-bit)                [RFC8919]
   1    Segment Routing Policy (S-bit) [RFC8919]
   2    Loop Free Alternate (F-bit)    [RFC8919]
   3-63 Unassigned

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