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Registries included below
Standards Action
| 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 2019-06-06, expires 2020-06-06) | [draft-ietf-lsr-flex-algo] |
Expert Review
Uma Chunduri, Jeff Tantsura
| Value | Name | Reference |
|---|---|---|
| 0 | Reserved | [RFC8491] |
| 1 | Base MPLS Imposition MSD | [RFC8491] |
| 2 | Entropy Label Readable Depth (ERLD) (TEMPORARY - registered 2019-08-29, expires 2020-08-29) | [draft-ietf-isis-mpls-elc] |
| 3-250 | Unassigned | |
| 251-254 | Experimental Use | [RFC8491] |
| 255 | Reserved | [RFC8491] |