Interior Gateway Protocol (IGP) Parameters
2017-12-18
2020-12-04
IGP Algorithm Types
Standards Action
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.
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.
2-127
Unassigned
128-255
Flexible Algorithms
(TEMPORARY - registered 2018-06-06, extension registered 2020-05-12, expires 2021-06-06)
IGP MSD-Types
Expert Review
Uma Chunduri, Jeff Tantsura
0
Reserved
1
Base MPLS Imposition MSD
2
ERLD-MSD
3-40
Unassigned
41
SRH Max SL
42
SRH Max End Pop
43
Unassigned
44
SRH Max H.encaps
45
SRH Max End D
46-250
Unassigned
251-254
Experimental Use
255
Reserved
Link Attribute Application Identifiers
Expert Review
Les Ginsberg, Chris Hopps
0
RSVP-TE (R-bit)
1
Segment Routing Policy (S-bit)
2
Loop Free Alternate (F-bit)
3-63
Unassigned