Internet Assigned Numbers Authority

Interior Gateway Protocol (IGP) Parameters

Created
2017-12-18
Last Updated
2023-10-13
Available Formats

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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 [RFC9350, Section 4]

IGP MSD-Types

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 [RFC9352]
42 SRH Max End Pop [RFC9352]
43 Unassigned
44 SRH Max H.encaps [RFC9352]
45 SRH Max End D [RFC9352]
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
[RFC9479]
Available Formats

CSV

IGP Metric-Type

Registration Procedure(s)
Standards Action
Reference
[RFC9350]
Available Formats

CSV
Type Description Reference
0 IGP Metric [RFC9350, Section 5.1]
1 Min Unidirectional Link Delay as defined in [RFC8570, Section 4.2] and [RFC7471, Section 4.2] [RFC9350, Section 5.1]
2 Traffic Engineering Default Metric as defined in [RFC5305, Section 3.7] and Traffic Engineering Metric as defined in [RFC3630, Section 2.5.5] [RFC9350, Section 5.1]
3 Bandwidth Metric (TEMPORARY - registered 2023-02-10, expires 2024-02-10) [draft-ietf-lsr-flex-algo-bw-con-05]
4-255 Unassigned

IGP Flexible Algorithm Definition Flags

Registration Procedure(s)
Standards Action
Reference
[RFC9350]
Available Formats

CSV
Bit Name Reference
0 Prefix Metric Flag (M-flag) [RFC9350, Sections 6.4 and 7.4]

Path Computation Element (PCE) Capability Flags

Registration Procedure(s)
IETF Review
Reference
[RFC9353]
Available Formats

CSV
Bit Capability Description Reference
0 Path computation with GMPLS link constraints [RFC5088]
1 Bidirectional path computation [RFC5088]
2 Diverse path computation [RFC5088]
3 Load-balanced path computation [RFC5088]
4 Synchronized paths computation [RFC5088]
5 Support for multiple objective functions [RFC5088]
6 Support for additive path constraints (max hop count, etc.) [RFC5088]
7 Support for request prioritization [RFC5088]
8 Support for multiple requests per message [RFC5088]
9 Global Concurrent Optimization (GCO) [RFC5557]
10 P2MP path computation [RFC8306]
11 Active stateful PCE capability [RFC8231]
12 Passive stateful PCE capability [RFC8231]
13 Active Stateful PCE with P2MP [RFC8623]
14 Passive Stateful PCE with P2MP [RFC8623]
15 Stateful PCE Initiation with P2MP [RFC8623]
16 FlowSpec [RFC9168]
17 TCP-AO Support [RFC9353]
18 PCEP over TLS support [RFC9353]
19-31 Unassigned

PCE Discovery (PCED) Sub-TLV Type Indicators

Registration Procedure(s)
Standards Action
Reference
[RFC9353]
Available Formats

CSV
Value Description Reference
0 Reserved [RFC9353][RFC5088]
1 PCE-ADDRESS [RFC9353][RFC5088]
2 PATH-SCOPE [RFC9353][RFC5088]
3 PCE-DOMAIN [RFC9353][RFC5088]
4 NEIG-PCE-DOMAIN [RFC9353][RFC5088]
5 PCE-CAP-FLAGS [RFC9353][RFC5088]
6 KEY-ID [RFC9353]
7 KEY-CHAIN-NAME [RFC9353]
8-65535 Unassigned