Border Gateway Protocol - Link State (BGP-LS) Parameters

Created

2015-11-03

Last Updated

2026-10-12

Available Formats

BGP-LS NLRI Types

Expert(s)

Hannes Gredler (primary), Adrian Farrel (secondary)

Reference

RFC 9552: Distribution of Link-State and Traffic Engineering Information Using BGP

Available Formats

CSV

Range	Registration Procedures
1-64999	Expert Review
65000-65535	Private Use

Type	NLRI Type	Reference
0	Reserved	RFC 9552
1	Node NLRI	RFC 9552
2	Link NLRI	RFC 9552
3	IPv4 Topology Prefix NLRI	RFC 9552
4	IPv6 Topology Prefix NLRI	RFC 9552
5	SR Policy Candidate Path NLRI	RFC 9857
6	SRv6 SID NLRI	RFC 9514
7	Inter-AS Link NLRI	RFC-ietf-idr-bgpls-inter-as-topology-ext-46
8-1100	Unassigned
1101	Not to be allocated
1102-64999	Unassigned
65000-65535	Private Use	RFC 9552

BGP-LS Protocol-IDs

Expert(s)

Hannes Gredler (primary), Adrian Farrel (secondary)

Reference

RFC 9552: Distribution of Link-State and Traffic Engineering Information Using BGP

Available Formats

CSV

Range	Registration Procedures
1-199	Expert Review
200-255	Private Use

Protocol-ID	NLRI information source protocol	Reference
0	Reserved	RFC 9552
1	IS-IS Level 1	RFC 9552
2	IS-IS Level 2	RFC 9552
3	OSPFv2	RFC 9552
4	Direct	RFC 9552
5	Static configuration	RFC 9552
6	OSPFv3	RFC 9552
7	BGP	RFC 9086
8	RSVP-TE	draft-ietf-idr-bgp-ls-te-path-01
9	Segment Routing	RFC 9857
10-199	Unassigned
200-255	Private Use	RFC 9552

BGP-LS Well-Known Instance-IDs (OBSOLETE)

Registration Procedure(s)

Registry closed

Reference

RFC 9552: Distribution of Link-State and Traffic Engineering Information Using BGP

Available Formats

CSV

Identifier	Routing Universe	Reference
0	Default Layer 3 Routing topology	RFC 9552
1-31	Unassigned
32 - 2^64-1	Private use - not recorded	RFC 9552

BGP-LS NLRI and Attribute TLVs

Expert(s)

Hannes Gredler (primary), Adrian Farrel (secondary)

Reference

RFC 9552: Distribution of Link-State and Traffic Engineering Information Using BGP

Available Formats

CSV

Range	Registration Procedures
0-255	Reserved (not to be allocated)
256-64999	Expert Review
65000-65535	Private Use

TLV Code Point	Description	Reference
0-255	Reserved	RFC 9552
256	Local Node Descriptors	RFC 9552, Section 5.2.1.2
257	Remote Node Descriptors	RFC 9552, Section 5.2.1.3
258	Link Local/Remote Identifiers	RFC 9552, Section 5.2.2
259	IPv4 interface address	RFC 9552, Section 5.2.2
260	IPv4 neighbor address	RFC 9552, Section 5.2.2
261	IPv6 interface address	RFC 9552, Section 5.2.2
262	IPv6 neighbor address	RFC 9552, Section 5.2.2
263	Multi-Topology Identifier	RFC 9552, Section 5.2.2.1
264	OSPF Route Type	RFC 9552, Section 5.2.3.1
265	IP Reachability Information	RFC 9552, Section 5.2.3.2
266	Node MSD	RFC 8814
267	Link MSD	RFC 8814
268-269	Unassigned
270	Remote AS Number	RFC-ietf-idr-bgpls-inter-as-topology-ext-46
271	IPv4 Remote ASBR ID	RFC-ietf-idr-bgpls-inter-as-topology-ext-46
272	IPv6 Remote ASBR ID	RFC-ietf-idr-bgpls-inter-as-topology-ext-46
273-511	Unassigned
512	Autonomous System	RFC 9552, Section 5.2.1.4
513	BGP-LS Identifier (deprecated)	RFC 9552, Section 5.2.1.4
514	OSPF Area-ID	RFC 9552, Section 5.2.1.4
515	IGP Router-ID	RFC 9552, Section 5.2.1.4
516	BGP Router-ID	RFC 9086
517	BGP Confederation Member	RFC 9086
518	SRv6 SID Information	RFC 9514
519-534	Unassigned
535	BGP Route Type	draft-ietf-idr-bgp-ls-bgp-only-fabric-06
536-549	Unassigned
550	Tunnel ID	draft-ietf-idr-bgp-ls-te-path-01
551	LSP ID	draft-ietf-idr-bgp-ls-te-path-01
552	IPv4/6 Tunnel Head-end address	draft-ietf-idr-bgp-ls-te-path-01
553	IPv4/6 Tunnel Tail-end address	draft-ietf-idr-bgp-ls-te-path-01
554	SR Policy Candidate Path Descriptor	RFC 9857
555	MPLS Local Cross Connect	draft-ietf-idr-bgp-ls-te-path-01
556	MPLS Cross Connect Interface	draft-ietf-idr-bgp-ls-te-path-01
557	MPLS Cross Connect FEC	draft-ietf-idr-bgp-ls-te-path-01
558-1023	Unassigned
1024	Node Flag Bits	RFC 9552, Section 5.3.1.1
1025	Opaque Node Attribute	RFC 9552, Section 5.3.1.5
1026	Node Name	RFC 9552, Section 5.3.1.3
1027	IS-IS Area Identifier	RFC 9552, Section 5.3.1.2
1028	IPv4 Router-ID of Local Node	RFC 9552, Section 5.3.1.4, 5.3.2.1
1029	IPv6 Router-ID of Local Node	RFC 9552, Section 5.3.1.4, 5.3.2.1
1030	IPv4 Router-ID of Remote Node	RFC 9552, Section 5.3.2.1
1031	IPv6 Router-ID of Remote Node	RFC 9552, Section 5.3.2.1
1032	S-BFD Discriminators	RFC 9247
1033	Unassigned
1034	SR Capabilities	RFC 9085, Section 2.1.2
1035	SR Algorithm	RFC 9085, Section 2.1.3
1036	SR Local Block	RFC 9085, Section 2.1.4
1037	SRMS Preference	RFC 9085, Section 2.1.5
1038	SRv6 Capabilities	RFC 9514
1039	Flexible Algorithm Definition	RFC 9351
1040	Flexible Algorithm Exclude-Any Affinity	RFC 9351
1041	Flexible Algorithm Include-Any Affinity	RFC 9351
1042	Flexible Algorithm Include-All Affinity	RFC 9351
1043	Flexible Algorithm Definition Flags	RFC 9351
1044	Flexible Algorithm Prefix Metric	RFC 9351
1045	Flexible Algorithm Exclude SRLG	RFC 9351
1046	Flexible Algorithm Unsupported	RFC 9351
1047	IP Algorithm	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1048	IP Algorithm Prefix Reachability	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1049	Flexible Algorithm Exclude Minimum Bandwidth	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1050	Flexible Algorithm Exclude Maximum Link Delay	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1051	Flexible Algorithm Reference Bandwidth	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1052	Flexible Algorithm Bandwidth Thresholds	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1053	Flexible Algorithm Exclude Any Reverse Affinity	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1054	Flexible Algorithm Include Any Reverse Affinity	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1055	Flexible Algorithm Include All Reverse Affinity	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1056	Generic Metric	draft-ietf-idr-bgp-ls-flex-algo-ext-01
1057-1087	Unassigned
1088	Administrative group (color)	RFC 9552, Section 5.3.2
1089	Maximum link bandwidth	RFC 9552, Section 5.3.2
1090	Max. reservable link bandwidth	RFC 9552, Section 5.3.2
1091	Unreserved bandwidth	RFC 9552, Section 5.3.2
1092	TE Default Metric	RFC 9552, Section 5.3.2.3
1093	Link Protection Type	RFC 9552, Section 5.3.2
1094	MPLS Protocol Mask	RFC 9552, Section 5.3.2.2
1095	IGP Metric	RFC 9552, Section 5.3.2.4
1096	Shared Risk Link Group	RFC 9552, Section 5.3.2.5
1097	Opaque Link Attribute	RFC 9552, Section 5.3.2.6
1098	Link Name	RFC 9552, Section 5.3.2.7
1099	Adjacency SID	RFC 9085, Section 2.2.1
1100	LAN Adjacency SID	RFC 9085, Section 2.2.2
1101	PeerNode SID	RFC 9086
1102	PeerAdj SID	RFC 9086
1103	PeerSet SID	RFC 9086
1104	Link MTU	draft-ietf-idr-bgp-ls-link-mtu-12
1105	RTM Capability	RFC 8169
1106	SRv6 End.X SID	RFC 9514
1107	IS-IS SRv6 LAN End.X SID	RFC 9514
1108	OSPFv3 SRv6 LAN End.X SID	RFC 9514
1109-1113	Unassigned
1114	Unidirectional Link Delay	RFC 8571
1115	Min/Max Unidirectional Link Delay	RFC 8571
1116	Unidirectional Delay Variation	RFC 8571
1117	Unidirectional Link Loss	RFC 8571
1118	Unidirectional Residual Bandwidth	RFC 8571
1119	Unidirectional Available Bandwidth	RFC 8571
1120	Unidirectional Utilized Bandwidth	RFC 8571
1121	Graceful-Link-Shutdown TLV	RFC 8379
1122	Application-Specific Link Attributes	RFC 9294
1123-1151	Unassigned
1152	IGP Flags	RFC 9552, Section 5.3.3.1
1153	IGP Route Tag	RFC 9552, Section 5.3.3.2
1154	IGP Extended Route Tag	RFC 9552, Section 5.3.3.3
1155	Prefix Metric	RFC 9552, Section 5.3.3.4
1156	OSPF Forwarding Address	RFC 9552, Section 5.3.3.5
1157	Opaque Prefix Attribute	RFC 9552, Section 5.3.3.6
1158	Prefix-SID	RFC 9085, Section 2.3.1
1159	Range	RFC 9085, Section 2.3.5
1160	IS-IS Flood Reflection	draft-ietf-idr-bgp-ls-isis-flood-reflection-02
1161	SID/Label	RFC 9085, Section 2.1.1
1162	SRv6 Locator	RFC 9514
1163-1169	Unassigned
1170	Prefix Attributes Flags	RFC 9085, Section 2.3.2
1171	Source Router Identifier	RFC 9085, Section 2.3.3
1172	L2 Bundle Member Attributes	RFC 9085, Section 2.2.3
1173	Extended Administrative Group	RFC 9104
1174	Source OSPF Router-ID	RFC 9085, Section 2.3.4
1175-1179	Unassigned
1180	SPF Capability (DEPRECATED)	RFC 9815
1181	Sequence Number	RFC 9815, Section 5.2.4
1182	IPv4 Link Prefix Length (DEPRECATED)	RFC 9815
1183	IPv6 Link Prefix Length (DEPRECATED)	RFC 9815
1184	SPF Status	RFC 9815, Section 5.2.1.1, 5.2.2.2, 5.2.3.1
1185	Address Family Link Descriptor	RFC 9815, Section 5.2.2.1
1186-1199	Unassigned
1200	MPLS-TE Path State	draft-ietf-idr-bgp-ls-te-path-01
1201	SR Binding SID	RFC 9857
1202	SR Candidate Path State	RFC 9857
1203	SR Candidate Path Name	RFC 9857
1204	SR Candidate Path Constraints	RFC 9857
1205	SR Segment List	RFC 9857
1206	SR Segment	RFC 9857
1207	SR Segment List Metric	RFC 9857
1208	SR Affinity Constraint	RFC 9857
1209	SR SRLG Constraint	RFC 9857
1210	SR Bandwidth Constraint	RFC 9857
1211	SR Disjoint Group Constraint	RFC 9857
1212	SRv6 Binding SID	RFC 9857
1213	SR Policy Name	RFC 9857
1214	SR Bidirectional Group Constraint	RFC 9857
1215	SR Metric Constraint	RFC 9857
1216	SR Segment List Bandwidth	RFC 9857
1217	SR Segment List Identifier	RFC 9857
1218	Path Segment sub-TLV	draft-ietf-idr-bgp-ls-sr-policy-path-segment-11
1219	Reverse Segment List sub-TLV	draft-ietf-idr-bgp-ls-sr-policy-path-segment-11
1220	NRP	draft-ietf-idr-bgp-ls-sr-policy-nrp-00
1221-1249	Unassigned
1250	SRv6 Endpoint Behavior	RFC 9514
1251	SRv6 BGP PeerNode SID	RFC 9514
1252	SRv6 SID Structure	RFC 9514
1253-64999	Unassigned
65000-65535	Private Use	RFC 9552

SRv6 BGP EPE SID Flags

Registration Procedure(s)

Standards Action

Reference

RFC 9514: Border Gateway Protocol - Link State (BGP-LS) Extensions for Segment Routing over IPv6 (SRv6)

Available Formats

CSV

Bit	Description	Reference
0	Backup Flag (B-Flag)	RFC 9514
1	Set Flag (S-Flag)	RFC 9514
2	Persistent Flag (P-Flag)	RFC 9514
3-7	Unassigned

BGP-LS Node Flags

Registration Procedure(s)

Expert Review

Expert(s)

Adrian Farrel, Hannes Gredler

Reference

RFC 9552: Distribution of Link-State and Traffic Engineering Information Using BGP

Available Formats

CSV

Bit	Description	Reference
0	Overload Bit (O-bit)	RFC 9552
1	Attached Bit (A-bit)	RFC 9552
2	External Bit (E-bit)	RFC 9552
3	ABR Bit (B-bit)	RFC 9552
4	Router Bit (R-bit)	RFC 9552
5	V6 Bit (V-bit)	RFC 9552
6-7	Unassigned

BGP-LS MPLS Protocol Mask

Registration Procedure(s)

Expert Review

Expert(s)

Adrian Farrel, Hannes Gredler

Reference

RFC 9552: Distribution of Link-State and Traffic Engineering Information Using BGP

Available Formats

CSV

Bit	Description	Reference
0	Label Distribution Protocol (L-bit)	RFC 9552
1	Extension to RSVP for LSP Tunnels (R-bit)	RFC 9552
2-7	Unassigned

BGP-LS IGP Prefix Flags

Registration Procedure(s)

Expert Review

Expert(s)

Adrian Farrel, Hannes Gredler

Reference

RFC 9552: Distribution of Link-State and Traffic Engineering Information Using BGP

Available Formats

CSV

Bit	Description	Reference
0	IS-IS Up/Down Bit (D-bit)	RFC 9552
1	OSPF "no unicast" Bit (N-bit)	RFC 9552
2	OSPF "local address" Bit (L-bit)	RFC 9552
3	OSPF "propagate NSSA" Bit (P-bit)	RFC 9552
4-7	Unassigned

BGP-LS SR Segment Descriptor Types

Registration Procedure(s)

Expert Review

Expert(s)

Matthew Bocci, Zafar Ali

Reference

RFC 9857: Advertisement of Segment Routing Policies Using BGP - Link State

Available Formats

CSV

Code Point	Segment Descriptor	Reference	Change Controller
0	Reserved	RFC 9857	IETF
1	Type A Segment	RFC 9857	IETF
2	Type B Segment	RFC 9857	IETF
3	Type C Segment	RFC 9857	IETF
4	Type D Segment	RFC 9857	IETF
5	Type E Segment	RFC 9857	IETF
6	Type F Segment	RFC 9857	IETF
7	Type G Segment	RFC 9857	IETF
8	Type H Segment	RFC 9857	IETF
9	Type I Segment	RFC 9857	IETF
10	Type J Segment	RFC 9857	IETF
11	Type K Segment	RFC 9857	IETF
12-255	Unassigned

BGP-LS SR Policy Metric Types

Registration Procedure(s)

Expert Review

Expert(s)

Stephane Litkowski, Jie Dong

Reference

RFC 9857: Advertisement of Segment Routing Policies Using BGP - Link State

Available Formats

CSV

Code Point	Metric Type	Reference	Change Controller
0	IGP	RFC 9857	IETF
1	Min Unidirectional Delay	RFC 9857	IETF
2	TE	RFC 9857	IETF
3	Hop Count	RFC 9857	IETF
4	SID List Length	RFC 9857	IETF
5	Bandwidth	RFC 9857	IETF
6	Avg Unidirectional Delay	RFC 9857	IETF
7	Unidirectional Delay Variation	RFC 9857	IETF
8	Loss	RFC 9857	IETF
9-127	Unassigned
128-255	User Defined	RFC 9857	IETF