Internet Assigned Numbers Authority IS-IS TLV Codepoints Created 2003-05-06 Last Updated 2024-04-17 Note For IS-IS registries and value ranges maintained via the "Expert Review" [RFC8126] registration procedure, guidance for IESG-designated experts can be found in [RFC7370]. Available Formats [IMG] XML [IMG] HTML [IMG] Plain text Registries included below • IS-IS Top-Level TLV Codepoints • IS-IS Authentication Type Codes • IS-IS Sub-TLVs for Reverse Metric TLV • IS-IS Sub-TLVs for TLVs Advertising Neighbor Information • IS-IS Neighbor Link-Attribute Bit Values • IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability • IS-IS Bit Values for Prefix Attribute Flags Sub-TLV • IS-IS Group Address Type Codes for GADDR-TLV • IS-IS Sub-TLVs for MT-Port-Cap-TLV • IS-IS Sub-TLVs for MT-Capability TLV • IS-IS Sub-TLVs for IS-IS Router CAPABILITY TLV • IS-IS Sub-Sub-TLVs for SRv6 Capabilities Sub-TLV • IS-IS SRv6 Capabilities Sub-TLV Flags • IS-IS Application Identifiers for Generic Information TLV • IS-IS Sub-Sub-TLVs for BIER Info Sub-TLV • IS-IS Sub-TLVs for Segment Identifier/Label Binding TLVs • IS-IS Sub-Sub-TLV Codepoints for Application-Specific Link Attributes • IS-IS Sub-TLVs for Application-Specific SRLG TLV • IS-IS Sub-Sub-TLVs for SRv6 SID Sub-TLVs • IS-IS SRv6 Locator TLV Flags • IS-IS SRv6 End SID Sub-TLV Flags • IS-IS SRv6 Adjacency SID Sub-TLVs Flags • IS-IS Sub-Sub-TLVs for Flexible Algorithm Definition Sub-TLV • IS-IS Sub-Sub-TLVs for Flood Reflection Discovery Sub-TLV • IS-IS Sub-TLVs for the Area Proxy TLV IS-IS Top-Level TLV Codepoints Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description Top-level TLVs for the IS-IS protocol Reference [RFC3563][RFC6233][RFC7356][RFC8918] Note IETF SHALL keep JTC1/SC6 informed of TLV codepoint values allocated, and JTC1/SC6 SHALL refer allocation requests arising within JTC1 constituencies to the IANA registry process. Note Codepoints greater than 255 can only be used in PDUs designated to support extended TLVs. Available Formats [IMG] CSV Value Name IIH LSP SNP Purge Status/Reference 0 Reserved [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 1 Area Addresses y y n n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 2 IIS Neighbors n y n n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 3 ES Neighbors n y n n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 4 Part. DIS n y n n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 5 Prefix Neighbors n y n n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 6 IIS Neighbors y n n n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] 7 Instance Identifier y y y y [RFC8202] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 8 Padding y n n n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 9 LSP Entries n n y n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 10 Authentication y y y y Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.][RFC6233] 11 ESN TLV y n y n [RFC7602] 12 Opt. Checksum y n y n [RFC3358] 13 Purge Originator Identification n n n y [RFC6232] [RFC8918] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 14 LSPBufferSize n y n n Routeing Exchange Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] 15 Router-Fingerprint y y n y [RFC8196] 16 Reverse Metric y n n n [RFC8500] 17 IS-IS Area Node IDs n y n n [RFC-ietf-lsr-dynamic-flooding-18] 18 IS-IS Flooding Path n y n n [RFC-ietf-lsr-dynamic-flooding-18] 19 IS-IS Flooding Request y n n n [RFC-ietf-lsr-dynamic-flooding-18] 20 Area Proxy n y n n [RFC-ietf-lsr-isis-area-proxy-12] Flooding Parameters TLV (TEMPORARY - 21 registered 2022-03-15, extension y n y n [draft-ietf-lsr-isis-fast-flooding-02] registered 2024-01-12, expires 2025-03-15) 22 Extended IS reachability n y n n [RFC5305] 23 IS Neighbor Attribute n y n n [RFC5311] 24 IS Alias ID n y n n [RFC5311] 25 L2 Bundle Member Attributes n y n n [RFC8668] 26 Unassigned 27 SRv6 Locator n y n n [RFC9352] Zone ID (TEMPORARY - registered 28 2020-11-20, extension registered n y n n [draft-ietf-lsr-isis-ttz-08] 2023-10-10, expires 2024-11-20) 29-41 Unassigned 42 DECnet Phase IV y n n n DEC (ancient) 43-65 Unassigned 66 Lucent Proprietary n y n n 67-125 Unassigned 126 IPv4 Algorithm Prefix Reachability n y n n [RFC9502, Section 6.1] 127 IPv6 Algorithm Prefix Reachability n y n n [RFC9502, Section 6.2] 128 IP Int. Reach n y n n [RFC1195][RFC5302] 129 Prot. Supported y y n n [RFC1195] 130 IP Ext. Address n y n n [RFC1195][RFC5302] 131 IDRPI n y y n [RFC1195] 132 IP Intf. Address y y n n [RFC1195] 133 Illegal n n n n [RFC1195] (not used) 134 Traffic Engineering router ID n y n n [RFC5305] 135 Extended IP reachability n y n n [RFC5305] 136 Unassigned 137 Dynamic Name n y n y [RFC5301] [RFC6233] 138 GMPLS-SRLG n y n n [RFC5307] 139 IPv6 SRLG n y n n [RFC6119] 140 IPv6 TE Router ID n y n n [RFC6119] 141 Inter-AS Reachability Information n y n n [RFC9346] 142 GADDR-TLV n y n n [RFC7176] 143 MT-Port-Cap-TLV y n n n [RFC6165] 144 MT-Capability TLV n y n n [RFC6329] 145 TRILL Neighbor TLV y n n n [RFC7176] 146 Unassigned 147 MAC-RI TLV n y n n [RFC6165] 148 BFD-Enabled TLV y n n n [RFC6213] 149 Segment Identifier / Label Binding n y n n [RFC8667] 150 Multi-Topology Segment Identifier / Label n y n n [RFC8667] Binding 151-160 Unassigned 161 Flood Reflection y n n n [RFC9377] 162-175 Unassigned 176 Nortel Proprietary n y n n 177 Nortel Proprietary n y n n 178-210 Unassigned 211 Restart TLV y n n n [RFC8706] 212-221 Unassigned 222 MT-ISN n y n n [RFC5120] 223 MT IS Neighbor Attribute n y n n [RFC5311] 224-228 Unassigned 229 M-Topologies y y n n [RFC5120] 230-231 Unassigned 232 IPv6 Intf. Addr. y y n n [RFC5308] 233 IPv6 Global Interface Address TLV y n n n [RFC6119] 234 Unassigned 235 MT IP. Reach n y n n [RFC5120] 236 IPv6 IP. Reach n y n n [RFC5308] 237 MT IPv6 IP. Reach n y n n [RFC5120] 238 Application-Specific SRLG n y n n [RFC9479] 239 Unassigned 240 P2P 3-Way Adj. State y n n n [RFC5303] 241 Unassigned 242 IS-IS Router CAPABILITY TLV n y n n [RFC7981] 243 Scope Flooding Support y n n n [RFC7356] 244-250 Unassigned 251 Generic Information n y n n [RFC6823] 252-65535 Unassigned IS-IS Authentication Type Codes Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description Type Codes for Authentication TLV (10) Reference [RFC5304] Available Formats [IMG] CSV Value Authentication Type Code Reference [ISO 10589, "Intermediate System to Intermediate System Intra- Domain Routeing Exchange 0 Reserved Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain Routeing Exchange 1 Cleartext Password Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] [ISO 10589, "Intermediate System to Intermediate System Intra- Domain Routeing Exchange 2 ISO 10589 Reserved Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] 3 Cryptographic Authentication (CRYPTO_AUTH) [RFC5310] 4-53 Unassigned 54 HMAC-MD5 Authentication [RFC5304] 55-254 Unassigned [ISO 10589, "Intermediate System to Intermediate System Intra- Domain Routeing Exchange 255 Routing Domain private authentication method Protocol for use in Conjunction with the Protocol for Providing the Connectionless-mode Network Service (ISO 8473)", International Standard 10589: 2002, Second Edition, 2002.] IS-IS Sub-TLVs for Reverse Metric TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description Sub-TLVs for Reverse Metric TLV (16) Reference [RFC8500] Available Formats [IMG] CSV Type Description Reference 0 Reserved [RFC8500] 1-17 Unassigned 18 Traffic Engineering Metric [RFC8500, Section 2] 19-255 Unassigned IS-IS Sub-TLVs for TLVs Advertising Neighbor Information Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-TLVs for TLVs advertising neighbor information. The list of TLVs includes: Extended IS reachability (22) IS Neighbor Attribute (23) L2 Bundle Member Attributes (25) inter-AS reachability information (141) MT-ISN (222) MT IS Neighbor Attribute (223) Reference [RFC5305][RFC5316][RFC7370][RFC8668] Note Allocations within this registry require documentation of the use of the allocated value and approval by the Designated Expert assigned by the IESG. Note The column for TLV 25 may be marked as follows: y - sub-TLV may appear in TLV 25 but MUST NOT be shared by multiple L2 Bundle Members y(s) - sub-TLV may appear in TLV 25 and MAY be shared by multiple L2 Bundle Members n - sub-TLV MUST NOT appear in TLV 25 Available Formats [IMG] CSV Type Description 22 23 25 141 222 223 Reference 0-2 Unassigned 3 Administrative group (color) y y y(s) y y y [RFC5305] 4 Link Local/Remote Identifiers y y y(s) y y y [RFC5307] 5 Unassigned 6 IPv4 interface address y y y(s) y y y [RFC5305] 7 Unassigned 8 IPv4 neighbor address y y y(s) y y y [RFC5305] 9 Maximum link bandwidth y y y(s) y y y [RFC5305] 10 Maximum reservable link bandwidth y y y(s) y y y [RFC5305] 11 Unreserved bandwidth y y y(s) y y y [RFC5305] 12 IPv6 Interface Address y y y(s) y y y [RFC6119] 13 IPv6 Neighbor Address y y y(s) y y y [RFC6119] 14 Extended Administrative Group y y y(s) y y y [RFC7308] 15 Link MSD y y y y y y [RFC8491] 16 Application-Specific Link Attributes y y y(s) y y y [RFC9479] 17 Generic Metric (TEMPORARY - registered 2023-02-17, extension y y n y y y [draft-ietf-lsr-flex-algo-bw-con-07, Section 2.1] registered 2023-12-07, expires 2025-02-17) 18 TE Default metric y y y(s) y y y [RFC5305] 19 Link-attributes y y y(s) y y y [RFC5029] 20 Link Protection Type y y y(s) y y y [RFC5307] 21 Interface Switching Capability Descriptor y y y(s) y y y [RFC5307] 22 Bandwidth Constraints y y y(s) y y y [RFC4124] 23 Unconstrained TE LSP Count (sub-)TLV y y y(s) y y y [RFC5330] 24 Remote AS Number n n n y n n [RFC9346] 25 IPv4 Remote ASBR Identifier n n n y n n [RFC9346] 26 IPv6 Remote ASBR Identifier n n n y n n [RFC9346] 27 Interface Adjustment Capability Descriptor (IACD) y y y(s) y y y [RFC6001] 28 MTU y y n n y y [RFC7176] 29 SPB-Metric y y y(s) n y y [RFC6329] 30 SPB-A-OALG y y y(s) n y y [RFC6329] 31 Adjacency Segment Identifier y y n y y y [RFC8667] 32 LAN Adjacency Segment Identifier y y n y y y [RFC8667] 33 Unidirectional Link Delay y y y y y y [RFC8570] 34 Min/Max Unidirectional Link Delay y y y y y y [RFC8570] 35 Unidirectional Delay Variation y y y y y y [RFC8570] 36 Unidirectional Link Loss y y y y y y [RFC8570] 37 Unidirectional Residual Bandwidth y y y y y y [RFC8570] 38 Unidirectional Available Bandwidth y y y y y y [RFC8570] 39 Unidirectional Utilized Bandwidth y y y y y y [RFC8570] 40 RTM Capability y y n n y y [RFC8169] 41 L2 Bundle Member Adj-SID n n y n n n [RFC8668] 42 L2 Bundle Member LAN Adj-SID n n y n n n [RFC8668] 43 SRv6 End.X SID y y y y y y [RFC9352, Section 8.1] 44 SRv6 LAN End.X SID y y y y y y [RFC9352, Section 8.2] 45 IPv6 Local ASBR Identifier n n n y n n [RFC9346] 46-160 Unassigned 161 Flood Reflector Adjacency y y n y y y [RFC9377] 162-249 Unassigned 250-254 Reserved for Cisco-specific extensions 255 Reserved for future expansion IS-IS Neighbor Link-Attribute Bit Values Registration Procedure(s) Standards Action Description This registry defines bit values for the Link-attributes sub-TLV (19) advertised in TLVs advertising neighbor information. These TLVs are listed in the description of the “IS-IS Sub-TLVs for TLVs Advertising Neighbor Information” registry. Reference [RFC5029][RFC-ietf-lsr-dynamic-flooding-18] Note The "L2BM" column indicates applicability to the L2 Bundle Member Attributes TLV. The options for the "L2BM" column are: Y - This bit MAY appear in the L2 Bundle Member Attributes TLV. N - This bit MUST NOT appear in the L2 Bundle Member Attributes TLV. Available Formats [IMG] CSV Value Name L2BM Reference 0x1 Local Protection Available N [RFC5029] 0x2 Link Excluded from Local Protection N [RFC5029] 0x4 Local Edge Enabled for Flooding (LEEF) (TEMPORARY - registered 2019-08-08, extension registered N [RFC-ietf-lsr-dynamic-flooding-18] 2023-06-21, expires 2024-08-08) IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-TLVs for TLVs advertising prefix reachability. The list of TLVs includes: SRv6 Locator (27) IPv4 Algorithm Prefix Reachability TLV (126) IPv6 Algorithm Prefix Reachability TLV (127) Extended IP reachability (135) MT IP Reach (235) IPv6 IP Reach (236) MT IPv6 IP Reach (237) Reference [RFC5305][RFC7370][RFC9352] Note Allocations within this registry require documentation of the use of the allocated value and approval by the Designated Expert assigned by the IESG. Available Formats [IMG] CSV Type Description 27 126 127 135 235 236 237 Reference 0 Unassigned 1 32-bit Administrative Tag Sub-TLV y y y y y y y [RFC5130] 2 64-bit Administrative Tag Sub-TLV y y y y y y y [RFC5130] 3 Prefix Segment Identifier n n n y y y y [RFC8667] 4 Prefix Attribute Flags y y y y y y y [RFC7794] 5 SRv6 End SID y n n n n n n [RFC9352, Section 7.2] 6 Flexible Algorithm Prefix Metric (FAPM) n n n y y y y [RFC9350, Section 8] 7-10 Unassigned 11 IPv4 Source Router ID y y y y y y y [RFC7794] 12 IPv6 Source Router ID y y y y y y y [RFC7794] 13-31 Unassigned 32 BIER Info n n n y y y y [RFC8401] 33-255 Unassigned IS-IS Bit Values for Prefix Attribute Flags Sub-TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines bit values for the Prefix Attribute Flags (4) sub-TLV advertised in Prefix Reachability TLVs. These TLVs are listed in the description of the "IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability” registry. Reference [RFC7794] Available Formats [IMG] CSV Bit # Name Reference 0 External Prefix Flag (X-flag) [RFC7794] 1 Re-advertisement Flag (R-flag) [RFC7794] 2 Node Flag (N-flag) [RFC7794] 3 ELC Flag (E-flag) [RFC9088] 4 Anycast Flag (A-flag) [RFC9352, Section 6] 5 U-Flag (TEMPORARY - registered 2023-12-21, expires 2024-12-21) [draft-ietf-lsr-igp-ureach-prefix-announce-01, Section 5.1] 6 UP-Flag (TEMPORARY - registered 2023-12-21, expires 2024-12-21) [draft-ietf-lsr-igp-ureach-prefix-announce-01, Section 5.1] IS-IS Group Address Type Codes for GADDR-TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines Group Address Type Codes for the GADDR-TLV (142). Reference [RFC7176] Available Formats [IMG] CSV Type Description Reference 0 Reserved [RFC7176] 1 GMAC-ADDR [RFC7176] 2 GIP-ADDR [RFC7176] 3 GIPV6-ADDR [RFC7176] 4 GLMAC-ADDR [RFC7176] 5 GLIP-ADDR [RFC7176] 6 GLIPV6-ADDR [RFC7176] 7-254 Unassigned 255 Reserved [RFC7176] IS-IS Sub-TLVs for MT-Port-Cap-TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-TLVs for the MT-Port-Cap-TLV (143). Reference [RFC7176] Available Formats [IMG] CSV Value Group Address Type Code Reference 0 Reserved [RFC7176] 1 VLAN-FLAGs [RFC7176] 2 Enabled-VLANs [RFC7176] 3 AppointedFwrdrs [RFC7176] 4 SPB-MCID [RFC6329] 5 SPB-Digest [RFC6329] 6 SPB-B-VID [RFC6329] 7 PORT-TRILL-VER [RFC7176] 8 VLANs-Appointed [RFC7176] 9-254 Unassigned 255 Reserved [RFC7176] IS-IS Sub-TLVs for MT-Capability TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-TLVs for the MT-Capability TLV (144). Reference [RFC6329] Available Formats [IMG] CSV Value Group Address Type Code Reference 0 Reserved [RFC6329] 1 SPB-Inst [RFC6329] 2 SPB-I-OALG [RFC6329] 3 SPBM-SI [RFC6329] 4 SPBV-ADDR [RFC6329] 5 Unassigned 6 NICKNAME [RFC7176] 7 TREES [RFC7176] 8 TREE-RT-IDs [RFC7176] 9 TREE-USE-IDs [RFC7176] 10 INT-VLAN [RFC7176] 11-12 Unassigned 13 TRILL-VER [RFC7176] 14 VLAN-GROUP [RFC7176] 15 INT-LABEL [RFC7176] 16 RBCHANNELS [RFC7176] 17 AFFINITY [RFC7176] 18 LABEL-GROUP [RFC7176] 19-20 Unassigned 21 Topology sub-TLV [RFC7813] 22 Hop sub-TLV [RFC7813] 23 Bandwidth Constraint sub-TLV [RFC7813] 24 Bandwidth Assignment sub-TLV [RFC7813] 25 Timestamp sub-TLV [RFC7813] 26-254 Unassigned 255 Reserved [RFC6329] IS-IS Sub-TLVs for IS-IS Router CAPABILITY TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-TLVs for the IS-IS Router CAPABILITY TLV (242). Reference [RFC7981] Note Allocations within this registry require documentation of the use of the allocated value and approval by the Designated Expert assigned by the IESG. Available Formats [IMG] CSV Value Description Reference 0 Reserved 1 TE Node Capability Descriptor [RFC5073] 2 Segment Routing Capability [RFC8667] 3 TE-MESH-GROUP TLV (IPv4) [RFC4972] 4 TE-MESH-GROUP TLV (IPv6) [RFC4972] 5 PCED sub-TLV [RFC5089] 6 NICKNAME [RFC7176] 7 TREES [RFC7176] 8 TREE-RT-IDs [RFC7176] 9 TREE-USE-IDs [RFC7176] 10 INT-VLAN [RFC7176] 11 IPv4 TE Router ID [RFC9346] 12 IPv6 TE Router ID [RFC9346] 13 TRILL-VER [RFC7176] 14 VLAN-GROUP [RFC7176] 15 INT-LABEL [RFC7176] 16 RBCHANNELS [RFC7176] 17 AFFINITY [RFC7176] 18 LABEL-GROUP [RFC7176] 19 Segment Routing Algorithm [RFC8667] 20 S-BFD Discriminators [RFC7883] 21 Node-Admin-Tag [RFC7917] 22 Segment Routing Local Block (SRLB) [RFC8667] 23 Node MSD [RFC8491] 24 Segment Routing Mapping Server Preference (SRMS Preference) [RFC8667] 25 SRv6 Capabilities [RFC9352, Section 2] 26 Flexible Algorithm Definition (FAD) [RFC9350, Section 5.1] 27 IS-IS Area Leader [RFC-ietf-lsr-dynamic-flooding-18] 28 IS-IS Dynamic Flooding [RFC-ietf-lsr-dynamic-flooding-18] 29 IP Algorithm [RFC9502, Section 5.1] 30-160 Unassigned 161 Flood Reflection Discovery [RFC9377] 162-255 Unassigned IS-IS Sub-Sub-TLVs for SRv6 Capabilities Sub-TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-sub-TLVs for the SRv6 Capabilities sub-TLV (25) advertised in the IS-IS Router CAPABILITY TLV (242). Reference [RFC9352] Available Formats [IMG] CSV Value Description Reference 0 Reserved [RFC9352] 1-255 Unassigned IS-IS SRv6 Capabilities Sub-TLV Flags Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines bit values advertised in the Flags field of the SRv6 Capabilities sub-TLV (25). This sub-TLV is advertised in the IS-IS Router CAPABILITY TLV (242). Reference [RFC9352] Available Formats [IMG] CSV Type Description Reference 0 Unassigned 1 O-flag [RFC9352, Section 2] 2-15 Unassigned IS-IS Application Identifiers for Generic Information TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines Application Identifiers for the Generic Information TLV (251). Reference [RFC6823] Available Formats [IMG] CSV ID Value Description Allowed in Instance zero (y/n) Reference 0 Reserved [RFC6823] 1 TRILL n [RFC7357] 2-65535 Unassigned IS-IS Sub-Sub-TLVs for BIER Info Sub-TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-sub-TLV codes which may be advertised in the BIER Info sub-TLV, which is advertised in Prefix Reachability TLVs. These TLVs are listed in the description of the "IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability” registry. Reference [RFC8401] Available Formats [IMG] CSV Type Name Reference 0 Unassigned 1 BIER MPLS Encapsulation [RFC8401] 2-255 Unassigned IS-IS Sub-TLVs for Segment Identifier/Label Binding TLVs Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-TLVs for Segment Identifier/Label Binding TLVs. The list of TLVs includes: Segment Identifier/Label Binding (149) Multi-Topology Segment Identifier/Label Binding (150) Reference [RFC8667] Available Formats [IMG] CSV Type Description Reference 0 Reserved [RFC8667] 1 SID/Label [RFC8667] 2 Unassigned 3 Prefix Segment Identifier [RFC8667] 4-255 Unassigned IS-IS Sub-Sub-TLV Codepoints for Application-Specific Link Attributes Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-sub-TLV codepoints for the Application-Specific Link Attributes sub-TLV, which is advertised in TLVs advertising neighbor information. These TLVs are listed in the description of the “IS-IS Sub-TLVs for TLVs Advertising Neighbor Information” registry. Reference [RFC9479] Note For future codepoints, in cases where the document that defines the encoding is different from the document that assigns the codepoint, the encoding reference MUST be to the document that defines the encoding. Note If a link attribute can be advertised both as a sub-TLV of TLVs advertising neighbor information and as a sub-sub-TLV of the Application-Specific Link Attributes sub-TLV defined in [RFC9479], then the same numerical code should be assigned to the link attribute whenever possible. Available Formats [IMG] CSV Type Description Reference 0-2 Unassigned 3 Administrative group (color) [RFC5305] 4-8 Unassigned 9 Maximum link bandwidth [RFC5305] 10 Maximum reservable link bandwidth [RFC5305] 11 Unreserved bandwidth [RFC5305] 12-13 Unassigned 14 Extended Administrative Group [RFC7308] 15-16 Unassigned 17 Generic Metric (TEMPORARY - registered 2023-02-17, extension registered 2023-12-07, [draft-ietf-lsr-flex-algo-bw-con-07, Section 2.1] expires 2025-02-17) 18 TE Default metric [RFC5305] 19-32 Unassigned 33 Unidirectional Link Delay [RFC8570] 34 Min/Max Unidirectional Link Delay [RFC8570] 35 Unidirectional Delay Variation [RFC8570] 36 Unidirectional Link Loss [RFC8570] 37 Unidirectional Residual Bandwidth [RFC8570] 38 Unidirectional Available Bandwidth [RFC8570] 39 Unidirectional Utilized Bandwidth [RFC8570] 40-255 Unassigned IS-IS Sub-TLVs for Application-Specific SRLG TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-TLVs for the Application-Specific SRLG TLV (TLV 238). Reference [RFC9479] Note For future codepoints, in cases where the document that defines the encoding is different from the document that assigns the codepoint, the encoding reference MUST be to the document that defines the encoding. Available Formats [IMG] CSV Value Description Reference 0-3 Unassigned 4 Link Local/Remote Identifiers [RFC5307] 5 Unassigned 6 IPv4 interface address [RFC5305] 7 Unassigned 8 IPv4 neighbor address [RFC5305] 9-11 Unassigned 12 IPv6 Interface Address [RFC6119] 13 IPv6 Neighbor Address [RFC6119] 14-255 Unassigned IS-IS Sub-Sub-TLVs for SRv6 SID Sub-TLVs Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines sub-sub-TLVs for SRv6 SID sub-TLVs. This includes the following sub-TLVs: SRv6 End SID (5) (Advertised in SRv6 Locator TLV (27)) SRv6 End.X SID (43) (Advertised in TLVs advertising neighbor information) SRv6 LAN End.X SID (44) (Advertised in TLVs advertising neighbor information) Reference [RFC9352] Available Formats [IMG] CSV Type Description 5 43 44 Reference 0 Reserved [RFC9352] 1 SRv6 SID Structure y y y [RFC9352] 2-255 Unassigned IS-IS SRv6 Locator TLV Flags Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines bit values advertised in the Flags field of the SRv6 Locator TLV (27). Reference [RFC9352] Available Formats [IMG] CSV Value Description Reference 0 D-flag [RFC9352, Section 7.1] 1-7 Unassigned IS-IS SRv6 End SID Sub-TLV Flags Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines bit values advertised in the Flags field of the SRv6 End SID sub-TLV (5), which is advertised in the SRv6 Locator TLV (27). Reference [RFC9352] Available Formats [IMG] CSV Value Description Reference 0-7 Unassigned IS-IS SRv6 Adjacency SID Sub-TLVs Flags Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry defines bit values advertised in the Flags field of SRv6 SID sub-TLVs associated with adjacencies. These sub-TLVs are advertised in TLVs advertising neighbor information. The list of sub-TLVs includes: SRv6 End.X SID (43) SRv6 LAN End.X SID (44) Reference [RFC9352] Available Formats [IMG] CSV Value Description Reference 0 B-flag [RFC9352, Section 8.1] 1 S-flag [RFC9352, Section 8.1] 2 P-flag [RFC9352, Section 8.1] 3-7 Unassigned IS-IS Sub-Sub-TLVs for Flexible Algorithm Definition Sub-TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Reference [RFC9350] Available Formats [IMG] CSV Type Description Reference 0 Reserved [RFC9350] 1 Flexible Algorithm Exclude Admin Group [RFC9350, Section 6.1] 2 Flexible Algorithm Include-Any Admin Group [RFC9350, Section 6.2] 3 Flexible Algorithm Include-All Admin Group [RFC9350, Section 6.3] 4 Flexible Algorithm Definition Flags [RFC9350, Section 6.4] 5 Flexible Algorithm Exclude SRLG [RFC9350, Section 6.5] 6 IS-IS Exclude Minimum Bandwidth (TEMPORARY - registered 2023-02-17, [draft-ietf-lsr-flex-algo-bw-con-07, Section 3.1.1] extension registered 2023-12-07, expires 2025-02-17) 7 IS-IS Exclude Maximum Delay (TEMPORARY - registered 2023-02-17, extension [draft-ietf-lsr-flex-algo-bw-con-07, Section 3.1.2] registered 2023-12-07, expires 2025-02-17) 8 IS-IS Reference Bandwidth (TEMPORARY - registered 2023-02-17, extension [draft-ietf-lsr-flex-algo-bw-con-07, Section 4.1.3.1] registered 2023-12-07, expires 2025-02-17) 9 IS-IS Threshold Metric (TEMPORARY - registered 2023-02-17, extension [draft-ietf-lsr-flex-algo-bw-con-07, Section 4.1.3.2] registered 2023-12-07, expires 2025-02-17) 10 Flexible Algorithm Exclude Reverse Admin Group (TEMPORARY - registered [draft-ietf-lsr-igp-flex-algo-reverse-affinity-01, Section 4] 2023-12-21, expires 2024-12-21) 11 Flexible Algorithm Include-Any Reverse Admin Group (TEMPORARY - registered [draft-ietf-lsr-igp-flex-algo-reverse-affinity-01, Section 5] 2023-12-21, expires 2024-12-21) 12 Flexible Algorithm Include-All Reverse Admin Group (TEMPORARY - registered [draft-ietf-lsr-igp-flex-algo-reverse-affinity-01, Section 6] 2023-12-21, expires 2024-12-21) 13-255 Unassigned IS-IS Sub-Sub-TLVs for Flood Reflection Discovery Sub-TLV Registration Procedure(s) Expert Review Expert(s) Chris Hopps, Hannes Gredler, Les Ginsberg Description This registry contains assigned sub-sub-TLV identifiers for Flood Reflection Discovery purposes. Reference [RFC9377] Available Formats [IMG] CSV Type Description Reference 0-160 Unassigned 161 Flood Reflection Discovery Tunnel Encapsulation Attribute [RFC9377] 162-255 Unassigned IS-IS Sub-TLVs for the Area Proxy TLV Registration Procedure(s) Expert Review with RFC Required Expert(s) Unassigned Description This registry defines sub-TLVs for the Area Proxy TLV (TLV 20). Reference [RFC-ietf-lsr-isis-area-proxy-12] Available Formats [IMG] CSV Value Name Reference 0 Unassigned 1 Area Proxy System Identifier [RFC-ietf-lsr-isis-area-proxy-12] 2 Area SID [RFC-ietf-lsr-isis-area-proxy-12] 3-255 Unassigned Licensing Terms