IS-IS TLV Codepoints
IS-IS
2003-05-06
2024-03-11
For IS-IS registries and value ranges maintained via the "Expert
Review" registration procedure, guidance for IESG-designated
experts can be found in .
IS-IS Top-Level TLV Codepoints
Expert Review
Top-level TLVs for the IS-IS protocol
Chris Hopps, Hannes Gredler, Les Ginsberg
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.
Codepoints greater than 255 can only be used in PDUs designated to
support extended TLVs.
0
Reserved
1
Area Addresses
y
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.
2
IIS Neighbors
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.
3
ES Neighbors
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.
4
Part. DIS
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.
5
Prefix Neighbors
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.
6
IIS Neighbors
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.
7
Instance Identifier
y
y
y
y
8
Padding
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.
9
LSP Entries
n
n
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.
10
Authentication
y
y
y
y
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.
11
ESN TLV
y
n
y
n
12
Opt. Checksum
y
n
y
n
13
Purge Originator Identification
n
n
n
y
14
LSPBufferSize
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.
15
Router-Fingerprint
y
y
n
y
16
Reverse Metric
y
n
n
n
17
IS-IS Area Node IDs TLV (TEMPORARY - registered 2019-08-08, extension registered 2023-06-21, expires 2024-08-08)
n
y
n
n
18
IS-IS Flooding Path TLV (TEMPORARY - registered 2019-08-08, extension registered 2023-06-21, expires 2024-08-08)
n
y
n
n
19
IS-IS Flooding Request TLV (TEMPORARY - registered 2019-08-08, extension registered 2023-06-21, expires 2024-08-08)
y
n
n
n
20
Area Proxy
n
y
n
n
21
Flooding Parameters TLV (TEMPORARY - registered 2022-03-15, extension registered 2024-01-12, expires 2025-03-15)
y
n
y
n
22
Extended IS reachability
n
y
n
n
23
IS Neighbor Attribute
n
y
n
n
24
IS Alias ID
n
y
n
n
25
L2 Bundle Member Attributes
n
y
n
n
26
Unassigned
27
SRv6 Locator
n
y
n
n
28
Zone ID (TEMPORARY - registered 2020-11-20, extension registered 2023-10-10, expires 2024-11-20)
n
y
n
n
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
129
Prot. Supported
y
y
n
n
130
IP Ext. Address
n
y
n
n
131
IDRPI
n
y
y
n
132
IP Intf. Address
y
y
n
n
133
Illegal
n
n
n
n
(not used)
134
Traffic Engineering router ID
n
y
n
n
135
Extended IP reachability
n
y
n
n
136
Unassigned
137
Dynamic Name
n
y
n
y
138
GMPLS-SRLG
n
y
n
n
139
IPv6 SRLG
n
y
n
n
140
IPv6 TE Router ID
n
y
n
n
141
Inter-AS Reachability Information
n
y
n
n
142
GADDR-TLV
n
y
n
n
143
MT-Port-Cap-TLV
y
n
n
n
144
MT-Capability TLV
n
y
n
n
145
TRILL Neighbor TLV
y
n
n
n
146
Unassigned
147
MAC-RI TLV
n
y
n
n
148
BFD-Enabled TLV
y
n
n
n
149
Segment Identifier / Label Binding
n
y
n
n
150
Multi-Topology Segment Identifier / Label Binding
n
y
n
n
151-160
Unassigned
161
Flood Reflection
y
n
n
n
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
212-221
Unassigned
222
MT-ISN
n
y
n
n
223
MT IS Neighbor Attribute
n
y
n
n
224-228
Unassigned
229
M-Topologies
y
y
n
n
230-231
Unassigned
232
IPv6 Intf. Addr.
y
y
n
n
233
IPv6 Global Interface Address TLV
y
n
n
n
234
Unassigned
235
MT IP. Reach
n
y
n
n
236
IPv6 IP. Reach
n
y
n
n
237
MT IPv6 IP. Reach
n
y
n
n
238
Application-Specific SRLG
n
y
n
n
239
Unassigned
240
P2P 3-Way Adj. State
y
n
n
n
241
Unassigned
242
IS-IS Router CAPABILITY TLV
n
y
n
n
243
Scope Flooding Support
y
n
n
n
244-250
Unassigned
251
Generic Information
n
y
n
n
252-65535
Unassigned
IS-IS Authentication Type Codes
Expert Review
Type Codes for Authentication TLV (10)
Chris Hopps, Hannes Gredler, Les Ginsberg
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)
4-53
Unassigned
54
HMAC-MD5 Authentication
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
Expert Review
Sub-TLVs for Reverse Metric TLV (16)
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
1-17
Unassigned
18
Traffic Engineering Metric
RFC8500, Section 2
19-255
Unassigned
IS-IS Sub-TLVs for TLVs Advertising Neighbor Information
Expert Review
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)
Chris Hopps, Hannes Gredler, Les Ginsberg
Allocations within this registry require documentation of the use of
the allocated value and approval by the Designated Expert assigned by
the IESG.
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
0-2
Unassigned
3
Administrative group (color)
y
y
y(s)
y
y
y
4
Link Local/Remote Identifiers
y
y
y(s)
y
y
y
5
Unassigned
6
IPv4 interface address
y
y
y(s)
y
y
y
7
Unassigned
8
IPv4 neighbor address
y
y
y(s)
y
y
y
9
Maximum link bandwidth
y
y
y(s)
y
y
y
10
Maximum reservable link bandwidth
y
y
y(s)
y
y
y
11
Unreserved bandwidth
y
y
y(s)
y
y
y
12
IPv6 Interface Address
y
y
y(s)
y
y
y
13
IPv6 Neighbor Address
y
y
y(s)
y
y
y
14
Extended Administrative Group
y
y
y(s)
y
y
y
15
Link MSD
y
y
y
y
y
y
16
Application-Specific Link Attributes
y
y
y(s)
y
y
y
17
Generic Metric
(TEMPORARY - registered 2023-02-17, extension registered 2023-12-07, expires 2025-02-17)
y
y
n
y
y
y
draft-ietf-lsr-flex-algo-bw-con-07, Section 2.1
18
TE Default metric
y
y
y(s)
y
y
y
19
Link-attributes
y
y
y(s)
y
y
y
20
Link Protection Type
y
y
y(s)
y
y
y
21
Interface Switching Capability Descriptor
y
y
y(s)
y
y
y
22
Bandwidth Constraints
y
y
y(s)
y
y
y
23
Unconstrained TE LSP Count (sub-)TLV
y
y
y(s)
y
y
y
24
Remote AS Number
n
n
n
y
n
n
25
IPv4 Remote ASBR Identifier
n
n
n
y
n
n
26
IPv6 Remote ASBR Identifier
n
n
n
y
n
n
27
Interface Adjustment Capability Descriptor
(IACD)
y
y
y(s)
y
y
y
28
MTU
y
y
n
n
y
y
29
SPB-Metric
y
y
y(s)
n
y
y
30
SPB-A-OALG
y
y
y(s)
n
y
y
31
Adjacency Segment Identifier
y
y
n
y
y
y
32
LAN Adjacency Segment Identifier
y
y
n
y
y
y
33
Unidirectional Link Delay
y
y
y
y
y
y
34
Min/Max Unidirectional Link Delay
y
y
y
y
y
y
35
Unidirectional Delay Variation
y
y
y
y
y
y
36
Unidirectional Link Loss
y
y
y
y
y
y
37
Unidirectional Residual Bandwidth
y
y
y
y
y
y
38
Unidirectional Available Bandwidth
y
y
y
y
y
y
39
Unidirectional Utilized Bandwidth
y
y
y
y
y
y
40
RTM Capability
y
y
n
n
y
y
41
L2 Bundle Member Adj-SID
n
n
y
n
n
n
42
L2 Bundle Member LAN Adj-SID
n
n
y
n
n
n
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
46-160
Unassigned
161
Flood Reflector Adjacency
y
y
n
y
y
y
162-249
Unassigned
250-254
Reserved for Cisco-specific extensions
255
Reserved for future expansion
IS-IS Neighbor Link-Attribute Bit Values
Standards Action
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.
0x1
Local Protection Available
0x2
Link Excluded from Local Protection
0x4
Local Edge Enabled for Flooding (LEEF) (TEMPORARY - registered 2019-08-08, extension registered 2023-06-21, expires 2024-08-08)
IS-IS Sub-TLVs for TLVs Advertising Prefix Reachability
Expert Review
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)
Chris Hopps, Hannes Gredler, Les Ginsberg
Allocations within this registry require documentation of the use of
the allocated value and approval by the Designated Expert assigned by
the IESG.
0
Unassigned
1
32-bit Administrative Tag Sub-TLV
y
y
y
y
y
y
y
2
64-bit Administrative Tag Sub-TLV
y
y
y
y
y
y
y
3
Prefix Segment Identifier
n
n
n
y
y
y
y
4
Prefix Attribute Flags
y
y
y
y
y
y
y
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
12
IPv6 Source Router ID
y
y
y
y
y
y
y
13-31
Unassigned
32
BIER Info
n
n
n
y
y
y
y
33-255
Unassigned
IS-IS Bit Values for Prefix Attribute Flags Sub-TLV
Expert Review
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.
Chris Hopps, Hannes Gredler, Les Ginsberg
0
External Prefix Flag (X-flag)
1
Re-advertisement Flag (R-flag)
2
Node Flag (N-flag)
3
ELC Flag (E-flag)
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
Expert Review
This registry defines Group Address Type Codes for the GADDR-TLV (142).
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
1
GMAC-ADDR
2
GIP-ADDR
3
GIPV6-ADDR
4
GLMAC-ADDR
5
GLIP-ADDR
6
GLIPV6-ADDR
7-254
Unassigned
255
Reserved
IS-IS Sub-TLVs for MT-Port-Cap-TLV
Expert Review
This registry defines sub-TLVs for the MT-Port-Cap-TLV (143).
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
1
VLAN-FLAGs
2
Enabled-VLANs
3
AppointedFwrdrs
4
SPB-MCID
5
SPB-Digest
6
SPB-B-VID
7
PORT-TRILL-VER
8
VLANs-Appointed
9-254
Unassigned
255
Reserved
IS-IS Sub-TLVs for MT-Capability TLV
Expert Review
This registry defines sub-TLVs for the MT-Capability TLV (144).
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
1
SPB-Inst
2
SPB-I-OALG
3
SPBM-SI
4
SPBV-ADDR
5
Unassigned
6
NICKNAME
7
TREES
8
TREE-RT-IDs
9
TREE-USE-IDs
10
INT-VLAN
11-12
Unassigned
13
TRILL-VER
14
VLAN-GROUP
15
INT-LABEL
16
RBCHANNELS
17
AFFINITY
18
LABEL-GROUP
19-20
Unassigned
21
Topology sub-TLV
22
Hop sub-TLV
23
Bandwidth Constraint sub-TLV
24
Bandwidth Assignment sub-TLV
25
Timestamp sub-TLV
26-254
Unassigned
255
Reserved
IS-IS Sub-TLVs for IS-IS Router CAPABILITY TLV
Expert Review
This registry defines sub-TLVs for the IS-IS Router CAPABILITY TLV (242).
Chris Hopps, Hannes Gredler, Les Ginsberg
Allocations within this registry require documentation of the use of
the allocated value and approval by the Designated Expert assigned by
the IESG.
0
Reserved
1
TE Node Capability Descriptor
2
Segment Routing Capability
3
TE-MESH-GROUP TLV (IPv4)
4
TE-MESH-GROUP TLV (IPv6)
5
PCED sub-TLV
6
NICKNAME
7
TREES
8
TREE-RT-IDs
9
TREE-USE-IDs
10
INT-VLAN
11
IPv4 TE Router ID
12
IPv6 TE Router ID
13
TRILL-VER
14
VLAN-GROUP
15
INT-LABEL
16
RBCHANNELS
17
AFFINITY
18
LABEL-GROUP
19
Segment Routing Algorithm
20
S-BFD Discriminators
21
Node-Admin-Tag
22
Segment Routing Local Block (SRLB)
23
Node MSD
24
Segment Routing Mapping Server Preference (SRMS Preference)
25
SRv6 Capabilities
RFC9352, Section 2
26
Flexible Algorithm Definition (FAD)
RFC9350, Section 5.1
27
IS-IS Area Leader Sub-TLV
(TEMPORARY - registered 2019-08-08, extension registered 2023-06-21, expires 2024-08-08)
28
IS-IS Dynamic Flooding Sub-TLV
(TEMPORARY - registered 2019-08-08, extension registered 2023-06-21, expires 2024-08-08)
29
IP Algorithm
RFC9502, Section 5.1
30-160
Unassigned
161
Flood Reflection Discovery
162-255
Unassigned
IS-IS Sub-Sub-TLVs for SRv6 Capabilities Sub-TLV
Expert Review
This registry defines sub-sub-TLVs for the SRv6 Capabilities sub-TLV (25)
advertised in the IS-IS Router CAPABILITY TLV (242).
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
1-255
Unassigned
IS-IS SRv6 Capabilities Sub-TLV Flags
Expert Review
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).
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Unassigned
1
O-flag
RFC9352, Section 2
2-15
Unassigned
IS-IS Application Identifiers for Generic Information TLV
Expert Review
This registry defines Application Identifiers for the Generic Information
TLV (251).
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
1
TRILL
n
2-65535
Unassigned
IS-IS Sub-Sub-TLVs for BIER Info Sub-TLV
Expert Review
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.
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Unassigned
1
BIER MPLS Encapsulation
2-255
Unassigned
IS-IS Sub-TLVs for Segment Identifier/Label Binding TLVs
Expert Review
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)
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
1
SID/Label
2
Unassigned
3
Prefix Segment Identifier
4-255
Unassigned
IS-IS Sub-Sub-TLV Codepoints for Application-Specific Link Attributes
Expert Review
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.
Chris Hopps, Hannes Gredler, Les Ginsberg
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.
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 ,
then the same numerical code should be assigned to the link attribute
whenever possible.
0-2
Unassigned
3
Administrative group (color)
4-8
Unassigned
9
Maximum link bandwidth
10
Maximum reservable link bandwidth
11
Unreserved bandwidth
12-13
Unassigned
14
Extended Administrative Group
15-16
Unassigned
17
Generic Metric
(TEMPORARY - registered 2023-02-17, extension registered 2023-12-07, expires 2025-02-17)
draft-ietf-lsr-flex-algo-bw-con-07, Section 2.1
18
TE Default metric
19-32
Unassigned
33
Unidirectional Link Delay
34
Min/Max Unidirectional Link Delay
35
Unidirectional Delay Variation
36
Unidirectional Link Loss
37
Unidirectional Residual Bandwidth
38
Unidirectional Available Bandwidth
39
Unidirectional Utilized Bandwidth
40-255
Unassigned
IS-IS Sub-TLVs for Application-Specific SRLG TLV
Expert Review
This registry defines sub-TLVs for the Application-Specific SRLG TLV (TLV 238).
Chris Hopps, Hannes Gredler, Les Ginsberg
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.
0-3
Unassigned
4
Link Local/Remote Identifiers
5
Unassigned
6
IPv4 interface address
7
Unassigned
8
IPv4 neighbor address
9-11
Unassigned
12
IPv6 Interface Address
13
IPv6 Neighbor Address
14-255
Unassigned
IS-IS Sub-Sub-TLVs for SRv6 SID Sub-TLVs
Expert Review
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)
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
1
SRv6 SID Structure
y
y
y
2-255
Unassigned
IS-IS SRv6 Locator TLV Flags
Expert Review
This registry defines bit values advertised in the Flags field of the
SRv6 Locator TLV (27).
Chris Hopps, Hannes Gredler, Les Ginsberg
0
D-flag
RFC9352, Section 7.1
1-7
Unassigned
IS-IS SRv6 End SID Sub-TLV Flags
Expert Review
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).
Chris Hopps, Hannes Gredler, Les Ginsberg
0-7
Unassigned
IS-IS SRv6 Adjacency SID Sub-TLVs Flags
Expert Review
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)
Chris Hopps, Hannes Gredler, Les Ginsberg
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
Expert Review
Chris Hopps, Hannes Gredler, Les Ginsberg
0
Reserved
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, extension registered 2023-12-07, expires 2025-02-17)
draft-ietf-lsr-flex-algo-bw-con-07, Section 3.1.1
7
IS-IS Exclude Maximum Delay
(TEMPORARY - registered 2023-02-17, extension registered 2023-12-07, expires 2025-02-17)
draft-ietf-lsr-flex-algo-bw-con-07, Section 3.1.2
8
IS-IS Reference Bandwidth
(TEMPORARY - registered 2023-02-17, extension registered 2023-12-07, expires 2025-02-17)
draft-ietf-lsr-flex-algo-bw-con-07, Section 4.1.3.1
9
IS-IS Threshold Metric
(TEMPORARY - registered 2023-02-17, extension registered 2023-12-07, expires 2025-02-17)
draft-ietf-lsr-flex-algo-bw-con-07, Section 4.1.3.2
10
Flexible Algorithm Exclude Reverse Admin Group
(TEMPORARY - registered 2023-12-21, expires 2024-12-21)
draft-ietf-lsr-igp-flex-algo-reverse-affinity-01, Section 4
11
Flexible Algorithm Include-Any Reverse Admin Group
(TEMPORARY - registered 2023-12-21, expires 2024-12-21)
draft-ietf-lsr-igp-flex-algo-reverse-affinity-01, Section 5
12
Flexible Algorithm Include-All Reverse Admin Group
(TEMPORARY - registered 2023-12-21, expires 2024-12-21)
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
Expert Review
This registry contains assigned sub-sub-TLV identifiers for Flood
Reflection Discovery purposes.
Chris Hopps, Hannes Gredler, Les Ginsberg
0-160
Unassigned
161
Flood Reflection Discovery Tunnel Encapsulation Attribute
162-255
Unassigned
IS-IS Sub-TLVs for the Area Proxy TLV
Expert Review with RFC Required
This registry defines sub-TLVs for the Area Proxy TLV (TLV 20).
Unassigned
0
Unassigned
1
Area Proxy System Identifier
2
Area SID
3-255
Unassigned