Interior Gateway Protocol (IGP) Parameters Created 2017-12-18 Last Updated 2020-12-04 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text 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 [IMG] CSV 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 2020-05-12, expires 2021-06-06) [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 [RFC-ietf-isis-mpls-elc-13] 3-40 Unassigned 41 SRH Max SL [draft-ietf-lsr-isis-srv6-extensions-08] 42 SRH Max End Pop [draft-ietf-lsr-isis-srv6-extensions-08] 43 Unassigned 44 SRH Max H.encaps [draft-ietf-lsr-isis-srv6-extensions-08] 45 SRH Max End D [draft-ietf-lsr-isis-srv6-extensions-08] 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