Interior Gateway Protocol (IGP) Parameters

Registries included below

IGP Algorithm Types

Registration Procedure(s)

Standards Action

Reference

[RFC8665]

Available Formats

CSV

Value	Description	Reference
0	Shortest Path First (SPF) algorithm based on link metric. This is the standard shortest path algorithm as computed by the IGP protocol. Consistent with the deployed practice for link-state protocols, Algorithm 0 permits any node to overwrite the SPF path with a different path based on its local policy.	[RFC8665]
1	Strict Shortest Path First (SPF) algorithm based on link metric. The algorithm is identical to Algorithm 0 but Algorithm 1 requires that all nodes along the path will honor the SPF routing decision. Local policy at the node claiming support for Algorithm 1 MUST NOT alter the SPF paths computed by Algorithm 1.	[RFC8665]
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]

Registration Procedure(s)

Expert Review

Expert(s)

Uma Chunduri, Jeff Tantsura

Reference

[RFC8491]

Available Formats

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]

Registration Procedure(s)

Expert Review

Expert(s)

Les Ginsberg, Chris Hopps

Reference

[RFC8919]

Available Formats

CSV