Internet Assigned Numbers Authority Border Gateway Protocol - Link State (BGP-LS) Parameters Created 2015-11-03 Last Updated 2025-03-17 Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registries included below • BGP-LS NLRI Types • BGP-LS Protocol-IDs • BGP-LS Well-Known Instance-IDs (OBSOLETE) • BGP-LS NLRI and Attribute TLVs • SRv6 BGP EPE SID Flags • BGP-LS Node Flags • BGP-LS MPLS Protocol Mask • BGP-LS IGP Prefix Flags • BGP-LS SR Segment Descriptor Types • BGP-LS SR Policy Metric Types BGP-LS NLRI Types Expert(s) Hannes Gredler (primary), Adrian Farrel (secondary) Reference [RFC9552] Available Formats [IMG] CSV Range Registration Procedures 1-64999 Expert Review 65000-65535 Private Use Type NLRI Type Reference 0 Reserved [RFC9552] 1 Node NLRI [RFC9552] 2 Link NLRI [RFC9552] 3 IPv4 Topology Prefix NLRI [RFC9552] 4 IPv6 Topology Prefix NLRI [RFC9552] 5 SR Policy Candidate Path NLRI [RFC-ietf-idr-bgp-ls-sr-policy-17] 6 SRv6 SID NLRI [RFC9514] 7 Stub Link NLRI [draft-ietf-idr-bgpls-inter-as-topology-ext-17] 8-1100 Unassigned 1101 Not to be allocated 1102-64999 Unassigned 65000-65535 Private Use [RFC9552] BGP-LS Protocol-IDs Expert(s) Hannes Gredler (primary), Adrian Farrel (secondary) Reference [RFC9552] Available Formats [IMG] CSV Range Registration Procedures 1-199 Expert Review 200-255 Private Use Protocol-ID NLRI information source protocol Reference 0 Reserved [RFC9552] 1 IS-IS Level 1 [RFC9552] 2 IS-IS Level 2 [RFC9552] 3 OSPFv2 [RFC9552] 4 Direct [RFC9552] 5 Static configuration [RFC9552] 6 OSPFv3 [RFC9552] 7 BGP [RFC9086] 8 RSVP-TE [draft-ietf-idr-bgp-ls-te-path-01] 9 Segment Routing [RFC-ietf-idr-bgp-ls-sr-policy-17] 10-199 Unassigned 200-255 Private Use [RFC9552] BGP-LS Well-Known Instance-IDs (OBSOLETE) Registration Procedure(s) Registry closed Reference [RFC9552] Available Formats [IMG] CSV Identifier Routing Universe Reference 0 Default Layer 3 Routing topology [RFC9552] 1-31 Unassigned 32 - 2^64-1 Private use - not recorded [RFC9552] BGP-LS NLRI and Attribute TLVs Expert(s) Hannes Gredler (primary), Adrian Farrel (secondary) Reference [RFC9552] Available Formats [IMG] 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 [RFC9552] 256 Local Node Descriptors [RFC9552, Section 5.2.1.2] 257 Remote Node Descriptors [RFC9552, Section 5.2.1.3] 258 Link Local/Remote Identifiers [RFC9552, Section 5.2.2] 259 IPv4 interface address [RFC9552, Section 5.2.2] 260 IPv4 neighbor address [RFC9552, Section 5.2.2] 261 IPv6 interface address [RFC9552, Section 5.2.2] 262 IPv6 neighbor address [RFC9552, Section 5.2.2] 263 Multi-Topology Identifier [RFC9552, Section 5.2.2.1] 264 OSPF Route Type [RFC9552, Section 5.2.3.1] 265 IP Reachability Information [RFC9552, Section 5.2.3.2] 266 Node MSD [RFC8814] 267 Link MSD [RFC8814] 268-269 Unassigned 270 Remote AS Number [draft-ietf-idr-bgpls-inter-as-topology-ext-17] 271 IPv4 Remote ASBR ID [draft-ietf-idr-bgpls-inter-as-topology-ext-17] 272 IPv6 Remote ASBR ID [draft-ietf-idr-bgpls-inter-as-topology-ext-17] 273-511 Unassigned 512 Autonomous System [RFC9552, Section 5.2.1.4] 513 BGP-LS Identifier (deprecated) [RFC9552, Section 5.2.1.4] 514 OSPF Area-ID [RFC9552, Section 5.2.1.4] 515 IGP Router-ID [RFC9552, Section 5.2.1.4] 516 BGP Router-ID [RFC9086] 517 BGP Confederation Member [RFC9086] 518 SRv6 SID Information [RFC9514] 519-549 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-ietf-idr-bgp-ls-sr-policy-17] 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 [RFC9552, Section 5.3.1.1] 1025 Opaque Node Attribute [RFC9552, Section 5.3.1.5] 1026 Node Name [RFC9552, Section 5.3.1.3] 1027 IS-IS Area Identifier [RFC9552, Section 5.3.1.2] 1028 IPv4 Router-ID of Local Node [RFC9552, Section 5.3.1.4/Section 5.3.2.1] 1029 IPv6 Router-ID of Local Node [RFC9552, Section 5.3.1.4/Section 5.3.2.1] 1030 IPv4 Router-ID of Remote Node [RFC9552, Section 5.3.2.1] 1031 IPv6 Router-ID of Remote Node [RFC9552, Section 5.3.2.1] 1032 S-BFD Discriminators [RFC9247] 1033 Unassigned 1034 SR Capabilities [RFC9085, Section 2.1.2] 1035 SR Algorithm [RFC9085, Section 2.1.3] 1036 SR Local Block [RFC9085, Section 2.1.4] 1037 SRMS Preference [RFC9085, Section 2.1.5] 1038 SRv6 Capabilities [RFC9514] 1039 Flexible Algorithm Definition [RFC9351] 1040 Flexible Algorithm Exclude-Any Affinity [RFC9351] 1041 Flexible Algorithm Include-Any Affinity [RFC9351] 1042 Flexible Algorithm Include-All Affinity [RFC9351] 1043 Flexible Algorithm Definition Flags [RFC9351] 1044 Flexible Algorithm Prefix Metric [RFC9351] 1045 Flexible Algorithm Exclude SRLG [RFC9351] 1046 Flexible Algorithm Unsupported [RFC9351] 1047-1087 Unassigned 1088 Administrative group (color) [RFC9552, Section 5.3.2] 1089 Maximum link bandwidth [RFC9552, Section 5.3.2] 1090 Max. reservable link bandwidth [RFC9552, Section 5.3.2] 1091 Unreserved bandwidth [RFC9552, Section 5.3.2] 1092 TE Default Metric [RFC9552, Section 5.3.2.3] 1093 Link Protection Type [RFC9552, Section 5.3.2] 1094 MPLS Protocol Mask [RFC9552, Section 5.3.2.2] 1095 IGP Metric [RFC9552, Section 5.3.2.4] 1096 Shared Risk Link Group [RFC9552, Section 5.3.2.5] 1097 Opaque Link Attribute [RFC9552, Section 5.3.2.6] 1098 Link Name [RFC9552, Section 5.3.2.7] 1099 Adjacency SID [RFC9085, Section 2.2.1] 1100 LAN Adjacency SID [RFC9085, Section 2.2.2] 1101 PeerNode SID [RFC9086] 1102 PeerAdj SID [RFC9086] 1103 PeerSet SID [RFC9086] 1104 Unassigned 1105 RTM Capability [RFC8169] 1106 SRv6 End.X SID [RFC9514] 1107 IS-IS SRv6 LAN End.X SID [RFC9514] 1108 OSPFv3 SRv6 LAN End.X SID [RFC9514] 1109-1113 Unassigned 1114 Unidirectional Link Delay [RFC8571] 1115 Min/Max Unidirectional Link Delay [RFC8571] 1116 Unidirectional Delay Variation [RFC8571] 1117 Unidirectional Link Loss [RFC8571] 1118 Unidirectional Residual Bandwidth [RFC8571] 1119 Unidirectional Available Bandwidth [RFC8571] 1120 Unidirectional Utilized Bandwidth [RFC8571] 1121 Graceful-Link-Shutdown TLV [RFC8379] 1122 Application-Specific Link Attributes [RFC9294] 1123-1151 Unassigned 1152 IGP Flags [RFC9552, Section 5.3.3.1] 1153 IGP Route Tag [RFC9552, Section 5.3.3.2] 1154 IGP Extended Route Tag [RFC9552, Section 5.3.3.3] 1155 Prefix Metric [RFC9552, Section 5.3.3.4] 1156 OSPF Forwarding Address [RFC9552, Section 5.3.3.5] 1157 Opaque Prefix Attribute [RFC9552, Section 5.3.3.6] 1158 Prefix-SID [RFC9085, Section 2.3.1] 1159 Range [RFC9085, Section 2.3.5] 1160 IS-IS Flood Reflection [draft-ietf-idr-bgp-ls-isis-flood-reflection-02] 1161 SID/Label [RFC9085, Section 2.1.1] 1162 SRv6 Locator [RFC9514] 1163-1169 Unassigned 1170 Prefix Attributes Flags [RFC9085, Section 2.3.2] 1171 Source Router Identifier [RFC9085, Section 2.3.3] 1172 L2 Bundle Member Attributes [RFC9085, Section 2.2.3] 1173 Extended Administrative Group [RFC9104] 1174 Source OSPF Router-ID [RFC9085, Section 2.3.4] 1175-1179 Unassigned 1180 SPF Capability (DEPRECATED) [RFC-ietf-lsvr-bgp-spf-51] 1181 Sequence Number [RFC-ietf-lsvr-bgp-spf-51, Section 5.2.4] 1182 IPv4 Link Prefix Length (DEPRECATED) [RFC-ietf-lsvr-bgp-spf-51] 1183 IPv6 Link Prefix Length (DEPRECATED) [RFC-ietf-lsvr-bgp-spf-51] 1184 SPF Status [RFC-ietf-lsvr-bgp-spf-51, Sections 5.2.1.1, 5.2.2.2, 5.2.3.1] 1185 Address Family Link Descriptor [RFC-ietf-lsvr-bgp-spf-51, 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-ietf-idr-bgp-ls-sr-policy-17] 1202 SR Candidate Path State [RFC-ietf-idr-bgp-ls-sr-policy-17] 1203 SR Candidate Path Name [RFC-ietf-idr-bgp-ls-sr-policy-17] 1204 SR Candidate Path Constraints [RFC-ietf-idr-bgp-ls-sr-policy-17] 1205 SR Segment List [RFC-ietf-idr-bgp-ls-sr-policy-17] 1206 SR Segment [RFC-ietf-idr-bgp-ls-sr-policy-17] 1207 SR Segment List Metric [RFC-ietf-idr-bgp-ls-sr-policy-17] 1208 SR Affinity Constraint [RFC-ietf-idr-bgp-ls-sr-policy-17] 1209 SR SRLG Constraint [RFC-ietf-idr-bgp-ls-sr-policy-17] 1210 SR Bandwidth Constraint [RFC-ietf-idr-bgp-ls-sr-policy-17] 1211 SR Disjoint Group Constraint [RFC-ietf-idr-bgp-ls-sr-policy-17] 1212 SRv6 Binding SID [RFC-ietf-idr-bgp-ls-sr-policy-17] 1213 SR Policy Name [RFC-ietf-idr-bgp-ls-sr-policy-17] 1214 SR Bidirectional Group Constraint [RFC-ietf-idr-bgp-ls-sr-policy-17] 1215 SR Metric Constraint [RFC-ietf-idr-bgp-ls-sr-policy-17] 1216 SR Segment List Bandwidth [RFC-ietf-idr-bgp-ls-sr-policy-17] 1217 SR Segment List Identifier [RFC-ietf-idr-bgp-ls-sr-policy-17] 1218-1219 Unassigned 1220 NRP [draft-ietf-idr-bgp-ls-sr-policy-nrp-00] 1221-1249 Unassigned 1250 SRv6 Endpoint Behavior [RFC9514] 1251 SRv6 BGP PeerNode SID [RFC9514] 1252 SRv6 SID Structure [RFC9514] 1253-64999 Unassigned 65000-65535 Private Use [RFC9552] SRv6 BGP EPE SID Flags Registration Procedure(s) Standards Action Reference [RFC9514] Available Formats [IMG] CSV Bit Description Reference 0 Backup Flag (B-Flag) [RFC9514] 1 Set Flag (S-Flag) [RFC9514] 2 Persistent Flag (P-Flag) [RFC9514] 3-7 Unassigned BGP-LS Node Flags Registration Procedure(s) Expert Review Expert(s) Adrian Farrel, Hannes Gredler Reference [RFC9552] Available Formats [IMG] CSV Bit Description Reference 0 Overload Bit (O-bit) [RFC9552] 1 Attached Bit (A-bit) [RFC9552] 2 External Bit (E-bit) [RFC9552] 3 ABR Bit (B-bit) [RFC9552] 4 Router Bit (R-bit) [RFC9552] 5 V6 Bit (V-bit) [RFC9552] 6-7 Unassigned BGP-LS MPLS Protocol Mask Registration Procedure(s) Expert Review Expert(s) Adrian Farrel, Hannes Gredler Reference [RFC9552] Available Formats [IMG] CSV Bit Description Reference 0 Label Distribution Protocol (L-bit) [RFC9552] 1 Extension to RSVP for LSP Tunnels (R-bit) [RFC9552] 2-7 Unassigned BGP-LS IGP Prefix Flags Registration Procedure(s) Expert Review Expert(s) Adrian Farrel, Hannes Gredler Reference [RFC9552] Available Formats [IMG] CSV Bit Description Reference 0 IS-IS Up/Down Bit (D-bit) [RFC9552] 1 OSPF "no unicast" Bit (N-bit) [RFC9552] 2 OSPF "local address" Bit (L-bit) [RFC9552] 3 OSPF "propagate NSSA" Bit (P-bit) [RFC9552] 4-7 Unassigned BGP-LS SR Segment Descriptor Types Registration Procedure(s) Expert Review Expert(s) Unassigned Reference [RFC-ietf-idr-bgp-ls-sr-policy-17] Available Formats [IMG] CSV Code Point Segment Descriptor Reference Change Controller 0 Reserved [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 1 (Type A) SR-MPLS Label [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 2 (Type B) SRv6 SID as IPv6 address [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 3 (Type C) SR-MPLS Prefix SID as IPv4 Node Address [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 4 (Type D) SR-MPLS Prefix SID as IPv6 Node Global Address [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 5 (Type E) SR-MPLS Adjacency SID as IPv4 Node Address & Local Interface ID [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 6 (Type F) SR-MPLS Adjacency SID as IPv4 Local & Remote Interface Addresses [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 7 (Type G) SR-MPLS Adjacency SID as pair of IPv6 Global Address & Interface ID for [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF Local & Remote nodes 8 (Type H) SR-MPLS Adjacency SID as pair of IPv6 Global Addresses for the Local & [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF Remote Interface 9 (Type I) SRv6 END SID as IPv6 Node Global Address [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 10 (Type J) SRv6 END.X SID as pair of IPv6 Global Address & Interface ID for Local [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF & Remote nodes 11 (Type K) SRv6 END.X SID as pair of IPv6 Global Addresses for the Local & Remote [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF Interface 12-255 Unassigned BGP-LS SR Policy Metric Types Registration Procedure(s) Expert Review Expert(s) Unassigned Reference [RFC-ietf-idr-bgp-ls-sr-policy-17] Available Formats [IMG] CSV Code Point Metric Type Reference Change Controller 0 IGP [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 1 Min Unidirectional Delay [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 2 TE [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 3 Hop Count [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 4 SID List Length [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 5 Bandwidth [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 6 Avg Unidirectional Delay [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 7 Unidirectional Delay Variation [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 8 Loss [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF 9-127 Unassigned 128-255 User Defined [RFC-ietf-idr-bgp-ls-sr-policy-17] IETF Licensing Terms