IS-IS TLV Codepoints
- Created
- 2003-05-06
- Last Updated
- 2025-06-23
- 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
-
XML
HTML
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 Sub-TLVs for Flooding Parameters TLV
- IS-IS Bit Values for Flooding Parameters Flags Sub-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][RFC-ietf-lsr-multi-tlv-19]
- 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
-
CSV
| Value | Name | IIH | LSP | SNP | Purge | MP | Status/Reference |
|---|---|---|---|---|---|---|---|
| 0 | Reserved | ||||||
| 1 | Area Addresses | y | y | n | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 2 | IIS Neighbors | n | y | n | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 3 | ES Neighbors | n | y | n | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 4 | Part. DIS | n | y | n | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 5 | Prefix Neighbors | n | y | n | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 6 | IIS Neighbors | y | n | n | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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 | y | [RFC8202] |
| 8 | Padding | y | n | n | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 9 | LSP Entries | n | n | y | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 10 | Authentication | y | y | y | y | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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 | n | [RFC7602] |
| 12 | Opt. Checksum | y | n | y | n | n | [RFC3358] |
| 13 | Purge Originator Identification | n | n | n | y | n | [RFC6232] [RFC8918] |
| 14 | LSPBufferSize | n | y | n | n | n | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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 | n | [RFC8196] |
| 16 | Reverse Metric | y | n | n | n | n | [RFC8500] |
| 17 | IS-IS Area Node IDs | n | y | n | n | n | [RFC9667] |
| 18 | IS-IS Flooding Path | n | y | n | n | n | [RFC9667] |
| 19 | IS-IS Flooding Request | y | n | n | n | n | [RFC9667] |
| 20 | Area Proxy | n | y | n | n | y | [RFC9666] |
| 21 | Flooding Parameters TLV | y | n | y | n | y | [RFC9681] |
| 22 | Extended IS reachability | n | y | n | n | y | [RFC5305] |
| 23 | IS Neighbor Attribute | n | y | n | n | y | [RFC5311] |
| 24 | IS Alias ID | n | y | n | n | n | [RFC5311] |
| 25 | L2 Bundle Member Attributes | n | y | n | n | y | [RFC8668] |
| 26 | Unassigned | ||||||
| 27 | SRv6 Locator | n | y | n | n | y | [RFC9352] |
| 28 | Zone ID (TEMPORARY - registered 2020-11-20, extension registered 2024-11-18, expires 2025-11-20) | n | y | n | n | n | [draft-ietf-lsr-isis-ttz-08] |
| 29-41 | Unassigned | ||||||
| 42 | DECnet Phase IV | y | n | n | n | n | DEC (ancient) |
| 43-65 | Unassigned | ||||||
| 66 | Lucent Proprietary | n | y | n | n | n | |
| 67-125 | Unassigned | ||||||
| 126 | IPv4 Algorithm Prefix Reachability | n | y | n | n | n | [RFC9502, Section 6.1] |
| 127 | IPv6 Algorithm Prefix Reachability | n | y | n | n | n | [RFC9502, Section 6.2] |
| 128 | IP Int. Reach | n | y | n | n | n | [RFC1195][RFC5302] |
| 129 | Prot. Supported | y | y | n | n | n | [RFC1195] |
| 130 | IP Ext. Address | n | y | n | n | n | [RFC1195][RFC5302] |
| 131 | IDRPI | n | y | y | n | n | [RFC1195] |
| 132 | IP Intf. Address | y | y | n | n | n | [RFC1195] |
| 133 | Illegal | n | n | n | n | n | [RFC1195] (not used) |
| 134 | Traffic Engineering router ID | n | y | n | n | n | [RFC5305] |
| 135 | Extended IP reachability | n | y | n | n | y | [RFC5305] |
| 136 | Unassigned | ||||||
| 137 | Dynamic Name | n | y | n | y | n | [RFC5301] [RFC6233] |
| 138 | GMPLS-SRLG | n | y | n | n | y | [RFC5307] |
| 139 | IPv6 SRLG | n | y | n | n | n | [RFC6119] |
| 140 | IPv6 TE Router ID | n | y | n | n | n | [RFC6119] |
| 141 | Inter-AS Reachability Information | n | y | n | n | y | [RFC9346] |
| 142 | GADDR-TLV | n | y | n | n | y | [RFC7176] |
| 143 | MT-Port-Cap-TLV | y | n | n | n | y | [RFC6165] |
| 144 | MT-Capability TLV | n | y | n | n | y | [RFC6329] |
| 145 | TRILL Neighbor TLV | y | n | n | n | n | [RFC7176] |
| 146 | Unassigned | ||||||
| 147 | MAC-RI TLV | n | y | n | n | y | [RFC6165] |
| 148 | BFD-Enabled TLV | y | n | n | n | y | [RFC6213] |
| 149 | Segment Identifier / Label Binding | n | y | n | n | y | [RFC8667] |
| 150 | Multi-Topology Segment Identifier / Label Binding | n | y | n | n | y | [RFC8667] |
| 151-160 | Unassigned | ||||||
| 161 | Flood Reflection | y | n | n | n | n | [RFC9377] |
| 162-175 | Unassigned | ||||||
| 176 | Nortel Proprietary | n | y | n | n | n | |
| 177 | Nortel Proprietary | n | y | n | n | n | |
| 178-210 | Unassigned | ||||||
| 211 | Restart TLV | y | n | n | n | n | [RFC8706] |
| 212-221 | Unassigned | ||||||
| 222 | MT-ISN | n | y | n | n | y | [RFC5120] |
| 223 | MT IS Neighbor Attribute | n | y | n | n | y | [RFC5311] |
| 224-228 | Unassigned | ||||||
| 229 | M-Topologies | y | y | n | n | n | [RFC5120] |
| 230-231 | Unassigned | ||||||
| 232 | IPv6 Intf. Addr. | y | y | n | n | n | [RFC5308] |
| 233 | IPv6 Global Interface Address TLV | y | n | n | n | n | [RFC6119] |
| 234 | Unassigned | ||||||
| 235 | MT IP. Reach | n | y | n | n | y | [RFC5120] |
| 236 | IPv6 IP. Reach | n | y | n | n | y | [RFC5308] |
| 237 | MT IPv6 IP. Reach | n | y | n | n | y | [RFC5120] |
| 238 | Application-Specific SRLG | n | y | n | n | y | [RFC9479] |
| 239 | Unassigned | ||||||
| 240 | P2P 3-Way Adj. State | y | n | n | n | n | [RFC5303] |
| 241 | Unassigned | ||||||
| 242 | IS-IS Router CAPABILITY TLV | n | y | n | n | y | [RFC7981] |
| 243 | Scope Flooding Support | y | n | n | n | n | [RFC7356] |
| 244-250 | Unassigned | ||||||
| 251 | Generic Information | n | y | n | n | y | [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
-
CSV
| Value | Authentication Type Code | Reference |
|---|---|---|
| 0 | Reserved | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 1 | Cleartext Password | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 2 | ISO 10589 Reserved | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
| 3 | Cryptographic Authentication (CRYPTO_AUTH) | [RFC5310] |
| 4-53 | Unassigned | |
| 54 | HMAC-MD5 Authentication | [RFC5304] |
| 55-254 | Unassigned | |
| 255 | Routing Domain private authentication method | [ISO 10589, "Intermediate System to Intermediate System Intra- Domain 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.] |
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][RFC-ietf-lsr-multi-tlv-19]
- Available Formats
-
CSV
| Type | Description | MP | Reference |
|---|---|---|---|
| 0 | Reserved | [RFC8500] | |
| 1-17 | Unassigned | ||
| 18 | Traffic Engineering Metric | n | [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][RFC-ietf-lsr-multi-tlv-19]
- 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
-
CSV
| Type | Description | 22 | 23 | 25 | 141 | 222 | 223 | MP | Reference |
|---|---|---|---|---|---|---|---|---|---|
| 0-2 | Unassigned | ||||||||
| 3 | Administrative group (color) | y | y | y(s) | y | y | y | n | [RFC5305] |
| 4 | Link Local/Remote Identifiers | y | y | y(s) | y | y | y | n | [RFC5307] |
| 5 | Unassigned | ||||||||
| 6 | IPv4 interface address | y | y | y(s) | y | y | y | n | [RFC5305] |
| 7 | Unassigned | ||||||||
| 8 | IPv4 neighbor address | y | y | y(s) | y | y | y | n | [RFC5305] |
| 9 | Maximum link bandwidth | y | y | y(s) | y | y | y | n | [RFC5305] |
| 10 | Maximum reservable link bandwidth | y | y | y(s) | y | y | y | n | [RFC5305] |
| 11 | Unreserved bandwidth | y | y | y(s) | y | y | y | n | [RFC5305] |
| 12 | IPv6 Interface Address | y | y | y(s) | y | y | y | n | [RFC6119] |
| 13 | IPv6 Neighbor Address | y | y | y(s) | y | y | y | n | [RFC6119] |
| 14 | Extended Administrative Group | y | y | y(s) | y | y | y | n | [RFC7308] |
| 15 | Link MSD | y | y | y | y | y | y | y | [RFC8491] |
| 16 | Application-Specific Link Attributes | y | y | y(s) | y | y | y | y | [RFC9479] |
| 17 | Generic Metric | y | y | y | y | y | y | n | [RFC-ietf-lsr-flex-algo-bw-con-22, Section 2.1] |
| 18 | TE Default metric | y | y | y(s) | y | y | y | n | [RFC5305] |
| 19 | Link-attributes | y | y | y(s) | y | y | y | n | [RFC5029] |
| 20 | Link Protection Type | y | y | y(s) | y | y | y | n | [RFC5307] |
| 21 | Interface Switching Capability Descriptor | y | y | y(s) | y | y | y | y | [RFC5307] |
| 22 | Bandwidth Constraints | y | y | y(s) | y | y | y | n | [RFC4124] |
| 23 | Unconstrained TE LSP Count (sub-)TLV | y | y | y(s) | y | y | y | n | [RFC5330] |
| 24 | Remote AS Number | n | n | n | y | n | n | n | [RFC9346] |
| 25 | IPv4 Remote ASBR Identifier | n | n | n | y | n | n | n | [RFC9346] |
| 26 | IPv6 Remote ASBR Identifier | n | n | n | y | n | n | n | [RFC9346] |
| 27 | Interface Adjustment Capability Descriptor (IACD) | y | y | y(s) | y | y | y | y | [RFC6001] |
| 28 | MTU | y | y | n | n | y | y | n | [RFC7176] |
| 29 | SPB-Metric | y | y | y(s) | n | y | y | n | [RFC6329] |
| 30 | SPB-A-OALG | y | y | y(s) | n | y | y | y | [RFC6329] |
| 31 | Adjacency Segment Identifier | y | y | n | y | y | y | n | [RFC8667] |
| 32 | LAN Adjacency Segment Identifier | y | y | n | y | y | y | n | [RFC8667] |
| 33 | Unidirectional Link Delay | y | y | y | y | y | y | n | [RFC8570] |
| 34 | Min/Max Unidirectional Link Delay | y | y | y | y | y | y | n | [RFC8570] |
| 35 | Unidirectional Delay Variation | y | y | y | y | y | y | n | [RFC8570] |
| 36 | Unidirectional Link Loss | y | y | y | y | y | y | n | [RFC8570] |
| 37 | Unidirectional Residual Bandwidth | y | y | y | y | y | y | n | [RFC8570] |
| 38 | Unidirectional Available Bandwidth | y | y | y | y | y | y | n | [RFC8570] |
| 39 | Unidirectional Utilized Bandwidth | y | y | y | y | y | y | n | [RFC8570] |
| 40 | RTM Capability | y | y | n | n | y | y | n | [RFC8169] |
| 41 | L2 Bundle Member Adj-SID | n | n | y | n | n | n | y | [RFC8668] |
| 42 | L2 Bundle Member LAN Adj-SID | n | n | y | n | n | n | y | [RFC8668] |
| 43 | SRv6 End.X SID | y | y | y | y | y | y | y | [RFC9352, Section 8.1] |
| 44 | SRv6 LAN End.X SID | y | y | y | y | y | y | y | [RFC9352, Section 8.2] |
| 45 | IPv6 Local ASBR Identifier | n | n | n | y | n | n | n | [RFC9346] |
| 46-160 | Unassigned | ||||||||
| 161 | Flood Reflector Adjacency | y | y | n | y | y | y | n | [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)
-
Expert Review
- Expert(s)
-
Chris Hopps, Hannes Gredler, Les Ginsberg
- 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][RFC9667][RFC9650]
- 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
-
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) | N | [RFC9667] |
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][RFC-ietf-lsr-multi-tlv-19]
- 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
-
CSV
| Type | Description | 27 | 126 | 127 | 135 | 235 | 236 | 237 | MP | Reference |
|---|---|---|---|---|---|---|---|---|---|---|
| 0 | Unassigned | |||||||||
| 1 | 32-bit Administrative Tag Sub-TLV | y | y | y | y | y | y | y | y | [RFC5130] |
| 2 | 64-bit Administrative Tag Sub-TLV | y | y | y | y | y | y | y | y | [RFC5130] |
| 3 | Prefix Segment Identifier | n | n | n | y | y | y | y | n | [RFC8667] |
| 4 | Prefix Attribute Flags | y | y | y | y | y | y | y | n | [RFC7794] |
| 5 | SRv6 End SID | y | n | n | n | n | n | n | y | [RFC9352, Section 7.2] |
| 6 | Flexible Algorithm Prefix Metric (FAPM) | n | n | n | y | y | y | y | n | [RFC9350, Section 8] |
| 7-10 | Unassigned | |||||||||
| 11 | IPv4 Source Router ID | y | y | y | y | y | y | y | n | [RFC7794] |
| 12 | IPv6 Source Router ID | y | y | y | y | y | y | y | n | [RFC7794] |
| 13-31 | Unassigned | |||||||||
| 32 | BIER Info | n | n | n | y | 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
-
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, extension registered 2024-12-10, expires 2025-12-21) | [draft-ietf-lsr-igp-ureach-prefix-announce-01, Section 5.1] |
| 6 | UP-Flag (TEMPORARY - registered 2023-12-21, extension registered 2024-12-10, expires 2025-12-21) | [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
-
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
-
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][RFC-ietf-lsr-multi-tlv-19]
- Available Formats
-
CSV
| Value | Group Address Type Code | MP | Reference |
|---|---|---|---|
| 0 | Reserved | [RFC6329] | |
| 1 | SPB-Inst | n | [RFC6329] |
| 2 | SPB-I-OALG | y | [RFC6329] |
| 3 | SPBM-SI | y | [RFC6329] |
| 4 | SPBV-ADDR | y | [RFC6329] |
| 5 | Unassigned | ||
| 6 | NICKNAME | y | [RFC7176] |
| 7 | TREES | n | [RFC7176] |
| 8 | TREE-RT-IDs | y | [RFC7176] |
| 9 | TREE-USE-IDs | y | [RFC7176] |
| 10 | INT-VLAN | y | [RFC7176] |
| 11-12 | Unassigned | ||
| 13 | TRILL-VER | n | [RFC7176] |
| 14 | VLAN-GROUP | y | [RFC7176] |
| 15 | INT-LABEL | y | [RFC7176] |
| 16 | RBCHANNELS | y | [RFC7176] |
| 17 | AFFINITY | y | [RFC7176] |
| 18 | LABEL-GROUP | y | [RFC7176] |
| 19-20 | Unassigned | ||
| 21 | Topology sub-TLV | y | [RFC7813] |
| 22 | Hop sub-TLV | n | [RFC7813] |
| 23 | Bandwidth Constraint sub-TLV | n | [RFC7813] |
| 24 | Bandwidth Assignment sub-TLV | n | [RFC7813] |
| 25 | Timestamp sub-TLV | n | [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][RFC-ietf-lsr-multi-tlv-19]
- 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
-
CSV
| Value | Description | MP | Reference |
|---|---|---|---|
| 0 | Reserved | ||
| 1 | TE Node Capability Descriptor | n | [RFC5073] |
| 2 | Segment Routing Capability | n | [RFC8667] |
| 3 | TE-MESH-GROUP TLV (IPv4) | y | [RFC4972] |
| 4 | TE-MESH-GROUP TLV (IPv6) | y | [RFC4972] |
| 5 | PCED sub-TLV | n | [RFC5089] |
| 6 | NICKNAME | y | [RFC7176] |
| 7 | TREES | n | [RFC7176] |
| 8 | TREE-RT-IDs | y | [RFC7176] |
| 9 | TREE-USE-IDs | y | [RFC7176] |
| 10 | INT-VLAN | y | [RFC7176] |
| 11 | IPv4 TE Router ID | n | [RFC9346] |
| 12 | IPv6 TE Router ID | n | [RFC9346] |
| 13 | TRILL-VER | n | [RFC7176] |
| 14 | VLAN-GROUP | y | [RFC7176] |
| 15 | INT-LABEL | y | [RFC7176] |
| 16 | RBCHANNELS | y | [RFC7176] |
| 17 | AFFINITY | y | [RFC7176] |
| 18 | LABEL-GROUP | y | [RFC7176] |
| 19 | Segment Routing Algorithm | n | [RFC8667] |
| 20 | S-BFD Discriminators | n | [RFC7883] |
| 21 | Node-Admin-Tag | n | [RFC7917] |
| 22 | Segment Routing Local Block (SRLB) | n | [RFC8667] |
| 23 | Node MSD | y | [RFC8491] |
| 24 | Segment Routing Mapping Server Preference (SRMS Preference) | n | [RFC8667] |
| 25 | SRv6 Capabilities | n | [RFC9352, Section 2] |
| 26 | Flexible Algorithm Definition (FAD) | n | [RFC9350, Section 5.1] |
| 27 | IS-IS Area Leader | n | [RFC9667] |
| 28 | IS-IS Dynamic Flooding | n | [RFC9667] |
| 29 | IP Algorithm | n | [RFC9502, Section 5.1] |
| 30 | MP-TLV Support for TLVs with implicit support | n | [RFC-ietf-lsr-multi-tlv-19, Section 7.2] |
| 31-160 | Unassigned | ||
| 161 | Flood Reflection Discovery | y | [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][RFC-ietf-lsr-multi-tlv-19]
- Available Formats
-
CSV
| Value | Description | MP | 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
-
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
-
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][RFC-ietf-lsr-multi-tlv-19]
- Available Formats
-
CSV
| Type | Name | MP | Reference |
|---|---|---|---|
| 0 | Unassigned | ||
| 1 | BIER MPLS Encapsulation | n | [RFC8401] |
| 2 | BIER PHP Request | n | [RFC-ietf-bier-php-16] |
| 3-255 | 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][RFC-ietf-lsr-multi-tlv-19]
- Available Formats
-
CSV
| Type | Description | MP | Reference |
|---|---|---|---|
| 0 | Reserved | [RFC8667] | |
| 1 | SID/Label | n | [RFC8667] |
| 2 | Unassigned | ||
| 3 | Prefix Segment Identifier | n | [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][RFC-ietf-lsr-multi-tlv-19]
- 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
-
CSV
| Type | Description | MP | Reference |
|---|---|---|---|
| 0-2 | Unassigned | ||
| 3 | Administrative group (color) | n | [RFC5305] |
| 4-8 | Unassigned | ||
| 9 | Maximum link bandwidth | n | [RFC5305] |
| 10 | Maximum reservable link bandwidth | n | [RFC5305] |
| 11 | Unreserved bandwidth | n | [RFC5305] |
| 12-13 | Unassigned | ||
| 14 | Extended Administrative Group | n | [RFC7308] |
| 15-16 | Unassigned | ||
| 17 | Generic Metric | y | [RFC-ietf-lsr-flex-algo-bw-con-22, Section 2.1] |
| 18 | TE Default metric | n | [RFC5305] |
| 19-32 | Unassigned | ||
| 33 | Unidirectional Link Delay | n | [RFC8570] |
| 34 | Min/Max Unidirectional Link Delay | n | [RFC8570] |
| 35 | Unidirectional Delay Variation | n | [RFC8570] |
| 36 | Unidirectional Link Loss | n | [RFC8570] |
| 37 | Unidirectional Residual Bandwidth | n | [RFC8570] |
| 38 | Unidirectional Available Bandwidth | n | [RFC8570] |
| 39 | Unidirectional Utilized Bandwidth | n | [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][RFC-ietf-lsr-multi-tlv-19]
- 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
-
CSV
| Value | Description | MP | Reference |
|---|---|---|---|
| 0-3 | Unassigned | ||
| 4 | Link Local/Remote Identifiers | n | [RFC5307] |
| 5 | Unassigned | ||
| 6 | IPv4 interface address | n | [RFC5305] |
| 7 | Unassigned | ||
| 8 | IPv4 neighbor address | n | [RFC5305] |
| 9-11 | Unassigned | ||
| 12 | IPv6 Interface Address | n | [RFC6119] |
| 13 | IPv6 Neighbor Address | n | [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][RFC-ietf-lsr-multi-tlv-19]
- Available Formats
-
CSV
| Type | Description | 5 | 43 | 44 | MP | Reference |
|---|---|---|---|---|---|---|
| 0 | Reserved | [RFC9352] | ||||
| 1 | SRv6 SID Structure | y | y | y | n | [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
-
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
-
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
-
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][RFC-ietf-lsr-multi-tlv-19]
- Available Formats
-
CSV
| Type | Description | MP | Reference |
|---|---|---|---|
| 0 | Reserved | [RFC9350] | |
| 1 | Flexible Algorithm Exclude Admin Group | n | [RFC9350, Section 6.1] |
| 2 | Flexible Algorithm Include-Any Admin Group | n | [RFC9350, Section 6.2] |
| 3 | Flexible Algorithm Include-All Admin Group | n | [RFC9350, Section 6.3] |
| 4 | Flexible Algorithm Definition Flags | n | [RFC9350, Section 6.4] |
| 5 | Flexible Algorithm Exclude SRLG | n | [RFC9350, Section 6.5] |
| 6 | IS-IS Exclude Minimum Bandwidth | n | [RFC-ietf-lsr-flex-algo-bw-con-22, Section 3.1.1] |
| 7 | IS-IS Exclude Maximum Delay | n | [RFC-ietf-lsr-flex-algo-bw-con-22, Section 3.1.2] |
| 8 | IS-IS Reference Bandwidth | n | [RFC-ietf-lsr-flex-algo-bw-con-22, Section 4.1.3.1] |
| 9 | IS-IS Bandwidth Threshold | n | [RFC-ietf-lsr-flex-algo-bw-con-22, Section 4.1.3.2] |
| 10 | Flexible Algorithm Exclude Reverse Admin Group (TEMPORARY - registered 2023-12-21, extension registered 2024-12-10, expires 2025-12-21) | n | [draft-ietf-lsr-igp-flex-algo-reverse-affinity-01, Section 4] |
| 11 | Flexible Algorithm Include-Any Reverse Admin Group (TEMPORARY - registered 2023-12-21, extension registered 2024-12-10, expires 2025-12-21) | n | [draft-ietf-lsr-igp-flex-algo-reverse-affinity-01, Section 5] |
| 12 | Flexible Algorithm Include-All Reverse Admin Group (TEMPORARY - registered 2023-12-21, extension registered 2024-12-10, expires 2025-12-21) | n | [draft-ietf-lsr-igp-flex-algo-reverse-affinity-01, Section 6] |
| 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][RFC-ietf-lsr-multi-tlv-19]
- Available Formats
-
CSV
| Type | Description | MP | Reference |
|---|---|---|---|
| 0-160 | Unassigned | ||
| 161 | Flood Reflection Discovery Tunnel Encapsulation Attribute | n | [RFC9377] |
| 162-255 | Unassigned |
IS-IS Sub-TLVs for the Area Proxy TLV
- Registration Procedure(s)
-
Expert Review with RFC Required
- Expert(s)
-
Chris Hopps, Hannes Gredler, Les Ginsberg
- Description
-
This registry defines sub-TLVs for the Area Proxy TLV (TLV 20).
- Reference
- [RFC9666]
- Available Formats
-
CSV
| Value | Name | Reference |
|---|---|---|
| 0 | Unassigned | |
| 1 | Area Proxy System Identifier | [RFC9666] |
| 2 | Area SID | [RFC9666] |
| 3-255 | Unassigned |
IS-IS Sub-TLVs for Flooding Parameters TLV
- Registration Procedure(s)
-
Expert Review
- Expert(s)
-
Chris Hopps, Hannes Gredler, Les Ginsberg
- Description
-
This registry defines sub-TLVs for the Flooding Parameters TLV(21).
- Reference
- [RFC9681]
- Available Formats
-
CSV
| Type | Description | Reference |
|---|---|---|
| 0 | Reserved | [RFC9681] |
| 1 | LSP Burst Size | [RFC9681] |
| 2 | LSP Transmission Interval | [RFC9681] |
| 3 | LSPs per PSNP | [RFC9681] |
| 4 | Flags | [RFC9681] |
| 5 | PSNP Interval | [RFC9681] |
| 6 | Receive Window | [RFC9681] |
| 7-255 | Unassigned |
IS-IS Bit Values for Flooding Parameters Flags Sub-TLV
- Registration Procedure(s)
-
Expert Review
- Expert(s)
-
Chris Hopps, Hannes Gredler, Les Ginsberg
- Description
-
This registry defines bit values for the Flags sub-TLV(4) advertised in the Flooding Parameters TLV(21).
- Reference
- [RFC9681]
- Note
-
In order to minimize encoding space, a new allocation should pick the smallest available value. - Available Formats
-
CSV
| Bit # | Description | Reference |
|---|---|---|
| 0 | Ordered acknowledgment (O-flag) | [RFC9681] |
| 1-63 | Unassigned |